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PCE-TDS 75
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© PCE Instruments
PCE-TDS 75 Ultrasonic Flow Meter
User Manual
User manuals in various languages (français,
italiano, español, português, nederlands, türk, polski,
русский, 中文
中文
中文
中文中文) can be found by using our
product search on: www.pce-instruments.com
Last change: 12 November 2021
v1.0
English
© PCE Instruments
Contents
1 Safety notes ........................................................................................... 1
2 Specications ........................................................................................ 2
2.1 Technical specications 2 ...................................................................................................
2.2 Delivery scope .................................................................................................................. 2
3 System description ............................................................................... 3
3.1 Device .............................................................................................................................. 3
4 Preparation ............................................................................................ 4
4.1 Wiring ............................................................................................................................... 4
4.2 Switchon .......................................................................................................................... 5
4.3 Functions of membrane keypad ....................................................................................... 5
5 Quick start 6 .............................................................................................
5.1 Basic settings ................................................................................................................... 6
6 Sensor installation ................................................................................ 8
6.1 Selection of the measuring location .................................................................................. 8
6.2 Mounting the sensors ....................................................................................................... 9
7 Operation ............................................................................................. 13
7.1 Normal operation .............................................................................................................13
7.2 Limit value for lowest ow rate .........................................................................................13
7.3 Zero setting .....................................................................................................................13
7.4 Scaling factor ..................................................................................................................14
7.5 System lock .....................................................................................................................14
7.6 Current loop output .........................................................................................................14
7.7 Frequency output ............................................................................................................14
7.8 Totalizer pulse output ......................................................................................................15
7.9 Alarm programming .........................................................................................................16
7.10 4-20 mA analogue output calibration ...............................................................................16
7.11 ESN ................................................................................................................................16
8 Explanation of the menu windows .................................................... 17
8.1 Display overview .............................................................................................................17
8.2 Menu window explanation ...............................................................................................18
© PCE Instruments
9 Troubleshooting .................................................................................. 34
9.1 Error codes during operation ...........................................................................................34
9.2 Frequently asked questions .............................................................................................35
10 Appendix - Use and communication protocol of serial interface
network ........................................................................................................ 36
10.1 Overview .........................................................................................................................36
10.2 Denitions of the serial port .............................................................................................36
10.3 Direct connection to the host device via RS232 ...............................................................37
10.4 Communication protocols and their use ...........................................................................37
11 Flow application data .......................................................................... 44
11.1 Sound velocities for dierent commonly used materials ..................................................44
11.2 Sound velocity in water (1atm = 1 bar) at dierent temperatures .....................................45
12 46 Contact ...............................................................................................
13 Disposal ............................................................................................... 46
© PCE Instruments
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1 Safety notes
Please read this manual carefully and completely before you use the device for the rst time. The
device may only be used by qualied personnel and repaired by PCE Instruments personnel.
Damage or injuries caused by non-observance of the manual are excluded from our liability and
not covered by our warranty.
• The device must only be used as described in this instruction manual. If used otherwise,
this can cause dangerous situations for the user and damage to the meter.
• The instrument may only be used if the environmental conditions (temperature, relative
humidity, …) are within the ranges stated in the technical specifications. Do not expose
the device to extreme temperatures, direct sunlight, extreme humidity or moisture.
• Do not expose the device to shocks or strong vibrations.
• The case should only be opened by qualied PCE Instruments personnel.
• Never use the instrument when your hands are wet.
• You must not make any technical changes to the device.
• The appliance should only be cleaned with a damp cloth. Use only pH-neutral cleaner,
no abrasives or solvents.
• The device must only be used with accessories from PCE Instruments or equivalent.
• Before each use, inspect the case for visible damage. If any damage is visible, do not
use the device.
• Do not use the instrument in explosive atmospheres.
• The measurement range as stated in the specications must not be exceeded under
any circumstances.
• Non-observance of the safety notes can cause damage to the device and injuries to
the user.
We do not assume liability for printing errors or any other mistakes in this manual.
We expressly point to our general guarantee terms which can be found in our general terms of
business.
If you have any questions please contact PCE Instruments. The contact details can be found at
the end of this manual.
© PCE Instruments
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2 Specications
2.1 Technical specifications
Model
PCE-TDS 75
Measurement range
±0.03 ... ±5 m/s (±0.09 ... ±16 ft/s)
Measurement accuracy
±1 % of measured value
Repeatability
0.2 %
Pipe diameter
25 ... 1200 mm (1 ... 48 ")
Analog output ue
0/4 ... 20 mA (maximum load 750 Ω)
Pulse output
0 ... 9999 Hz OCT
(frequency limits are adjustable)
Relay output
1 A at 125 VAC, 2 A at 30 VDC
maximum frequency 1 Hz
Communication interface
RS232 & RS485
Power supply
10 ... 36 VDC
Power consumption
1 A
Display
LCD, 256 x 128 pixels, with backlight
Ambient conditions base
-40 ... 60 °C ( -40 ... 140 °F),
0 ... 99 % , non-condensing RH
Ambient conditions sensor
-40 ... 80 °C (-40 ... 176 °F),
0 ... 99 % -condensing RH, non
Housing material base
PC/ABS
Protection class base
IP 65
Protection class sensor
IP 68
Cable length
9 m, 30 ft
Dimensions
16 x 23 x 28 cm / 6.3 x 9.1 x 11"
Weight
3.2 kg / 7.1 lbs
2.2 Delivery scope
1 x ultrasonic ow meter PCE-TDS 75
2 x ow sensor (9 m cable length)
2 x pipe clamp
1 x ultrasound contact gel
1 x mounting plate
1 x user manual
1 x factory calibration certicate
© PCE Instruments
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3 System description
3.1 Device
Front
Bottom
1 Display
2 Membrane keypad
3 Sensor
4 Wiring channels / sensor port
© PCE Instruments
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4 Preparation
4.1 Wiring
Open the device by loosening the four screws on the front to gain access to the ports for the
power supply, for the sensors, etc. First, lead the cables for the power supply through the cable
gland provided for this purpose and establish the power supply via the DC+ and DC- connections.
Ensure correct polarity. Then connect the inlet sensor and the outlet sensor to the corresponding
ports. For more information on the connection labels, refer to the following chart. When
connecting, make absolutely sure that there is no voltage.
Character
Description
DC+
Direct current DC 10 36 V+ …
DC-
Direct current DC 10 36 V …
Grounding
RL OUT+
Relay output
RL OUT-
OCT OUT+
OCT output
OCT OUT
GND
Inlet sensor ground (black)
UP+
Inlet sensor + (brown)
UP-
Inlet sensor - (blue)
GND
Outlet sensor ground (black)
DN+
Outlet sensor + (brown)
DN-
Outlet sensor - (blue)
I OUT+
4 20 mA output …
I OUT-
TX
RS232 output
RX
GND
A
RS485 output
B
Attention!
Only wire the PCE-TDS 75 when it is switched o. The unit must be reliably grounded
before installation and use. Use either AC or DC power. Do not connect both at the
same time.
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4.2 Switchon
As soon as the PCE-TDS 75 is connected to a power source, it starts automatically and the
system runs automatically according to the parameters last entered. After *R is displayed in the
upper right corner, the instrument will automatically start measuring .
If this is the rst use or installation at a new location, you must enter the parameters of the new
installation location. All parameters set by the user are permanently saved until changed. The
ow meter will continue to measure continuously regardless of the menu that is open.
4.3 Functions of membrane keypad
Comma
Back key / return to previous menu
Open the next menu / decrease a number
Return to previous menu / increase a number
Open menu
Conrm / edit
© PCE Instruments
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5 Quick start
5.1 Basic settings
This example assumes a 4 mm thick PVC pipe without coating with a diameter of 200 mm. The
medium owing through the pipe is water.
These parameters should be adopted as follows:
Step 1 Pipe dimensions
Open M10 (menu 10) by pressing the menu
key and then entering the number 10. Now
enter the diameter and thickness of the pipe
and conrm with the ENTER key.
Step 2. Pipe material
Press the "↓" key to select the pipe material.
Select PVC and conrm your entry with the
ENTER key.
Step 3 Water temperature
Open M12 and enter the water temperature.
The temperature should be within the range of
0 ... 80 °C.
Press ENTER to conrm your entry.
Step 4 Sensor type
Open M13 and select the sensor type. Here,
you can select the rst sensor type, i. e. Clamp-
On-D. Conrm your entry with ENTER.
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Step 5. Mounting method
Press "↓" to switch to the next submenu. Here,
you select 0.V, for example. Press ENTER to
conrm your selection.
Step 6. Sensor spacing
Open M14 and mount the sensors according to
the indicated distance and the selected
method.
Step 7 Display measured value
Open menu 01 to display the flow rate in m³/h.
Attention!
Always press the ENTER key rst if you want to change a parameter. If "Change" is
still not possible after pressing the ENTER key, this means that the system is locked
by a password. To unlock, select "Unlock" in window M54 and enter the password
you have previously specied.
© PCE Instruments
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6 Sensor installation
6.1 Selection of the measuring location
The installation of the PCE-TDS 75 is very simple. You only need a suitable measuring location,
then attach the sensors the pipe and start the measurement. The following must be observed to
when selecting a suitable installation location:
• Select a pipe section that is always lled with liquid, e. g. a vertical pipe with ow
upwards or a full horizontal pipe.
• Ensure a suciently straight pipe length for the installation of the upstream and
downstream sensors.
• In the case of a horizontal pipe, the sensors should be mounted on the side to prevent
air bubbles at the top or deposits at the bottom from falsifying the measurement result.
• Make sure that the temperature of the measuring location is below the temperature
limits of the sensors.
• The inside of the pipe should also be in good condition. If possible, choose a section of
pipe where the interior is free from corrosion.
• The section must be sound-conducting.
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6.2 Mounting the sensors
Make sure that the pipe surface where the sensors are to be mounted is clean and smooth. There
should also be no rust or loose paint on it. Select a suitable section and do not forget to apply the
coupling gel. Apply the coupling gel to the cent of each sensor and to the pipe re ’s front surface
surface. Ensure that there are no air bubbles between the sensors and the pipe wall, then attach
the sensors to the pipe using the pipe clamps provided and tighten them securely.
Note:
The two sensors should be mounted laterally centrally on horizontal pipes. Make sure that and
the mounting direction of the sensors is parallel to the ow. If the sensors cannot be mounted
horizontally symmetrically due to limited local installation conditions, it may be necessary to mount
the sensors at a location where the pipe is always lled with liquid.
6.2.1 Sensor spacing
The distance between the ends of the two sensors can be looked up in M14 (menu 14). After
entering the required parameters, check the data displayed in window M14 and adjust the spacing
between the sensors according to the data.
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6.2.2 Selection of the measuring method
There are two mounting methods you can use depending on the measurement environment he : t
V method (reect method) and the Z method (direct method). The V method is easy to install and
suitable for most ultrasonic environments, the Z method has a stronger signal and works better
in complicated measurement environments.
V method
The V method is considered the standard method. It is practical to use. Nevertheless, it must be
ensured that the pipe is mounted correctly (see 6.2 .).
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Z method
If the pipe diameter is too large or the lining is too thick, it is recommended to use the Z method.
The signal transmitted after a Z-method installation has less attenuation than a signal transmitted
using the V method. This is because the Z method uses a directly transmitted (rather than
reected) signal that passes through the medium only once. With the Z method, you can measure
on pipe diameters ranging from 100 to 5000 mm (4 ... 200 in.). Therefore, we recommend the Z
method for pipe diameters over 300 mm (12 in.).
6.2.3 Inspection
Verify that the sensors are properly installed and that there is an accurate and strong ultrasonic
signal that ensures proper operation and high reliability of the sensors. This can be conrmed by
checking the detected signal strength, the total transit time, the delta time as well as the transit
time ratio. The following inspections must be made to ensure high reliability of the measurement
and long-term operation of the device.
Signal strength
The signal strength can be checked in window M04. Here, you can see the strength of the signal
of both sensors. The signal strength is indicated by numbers from 00.0 to 99.9. 00.0 stands for
no detected signal, while 99.9 stands for the maximum signal strength. The stronger the detected
signal strength, the longer the device works reliably and the more stable the obtained measured
value will be. Position the sensors optimally and check whether sucient coupling gel was applied
during installation to obtain the maximum signal strength. The system requires a signal strength
of more than 75.0 for both sensors. If the determined signal strength is too low, the position of the
sensors and the spacing should be re-adjusted and the pipe re-inspected. You can also change
the mounting method to rectify this problem.
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Signal quality
The signal quality or Q value is displayed in window M04. It indicates the level of the detected
signal. The Q value is indicated by numbers from 00 to 99. 00 represents the weakest detected
signal 99 represents the maximum. The position of the sensors should be adjusted until whereas
the detected signal quality is as strong as possible.
Total time and delta time
The total transit time and the total transit time dierence, which are displayed in window M04, are
further factors for the measurement accuracy. The measurement calculations in the flow meter
are based on these two parameters. Therefore, if the total transit time dierence varies greatly, it
means that the detected signal quality is too poor. This may be the result of poor pipe installation
conditions, inadequate sensor installation or incorrect parameter entry. In general, the variation
of the total transit time dierence should be less than ±20 %. Only if the pipe diameter is too small
or the velocity too low, the variation can be larger.
Transit time ratio
The transit time ratio indicates whether the mounting distance of the sensors is accurate. The
normal transit time ratio should be 100 ±3 % when properly installed. Check this in window M04.
If the transit time ratio exceeds 100 ±3 %, a check is required:
• whether the parameters (pipe outside diameter, wall thickness, pipe material, lining,
etc.) have been entered correctly,
• whether the mounting distance of the sensors corresponds to the display in window
M14,
• whether the sensors are correctly positioned on the pipe,
• whether the shape of the pipe is distorted or deformed.
6.2.4 Warnings
The pipe parameters must be entered accurately or the ow meter will not work properly.
• During installation, apply enough coupling gel to mount the sensors to the pipe wall.
While checking the signal strength and Q value, slowly move the sensors across the
mounting location until the strongest signal and maximum Q value are reached. Note
that the larger the pipe diameter, the more the sensors need to be moved.
• Check that the mounting distance matches the indication in window M14 and that the
sensors are mounted centrally on the pipe on the same pipe size.
• Pay special attention to pipes with seams as such pipes are usually uneven. If the
signal strength is always displayed as 0.00 this means that no signal is detected. ,
Therefore, it is necessary to check whether the parameters (including all pipe
parameters) have been entered correctly. Check that the sensor mounting method is
correct, the pipe is not worn and the lining is not too thick. Make sure that there is
actually uid in the pipe or that the sensors are not too close to a valve or manifold
and that there are not too many air bubbles in the uid, etc. If still no signal is
detected, the measuring location must be changed.
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• Make sure that the PCE-TDS 75 can operate properly and with high reliability. The
stronger the signal strength displayed, the higher the achieved Q value. The longer
the ow meter runs accurately, the higher the reliability of the displayed ow rates. If
there is interference from electromagnetic waves in the environment or the detected
signal is too weak, the displayed ow rate value is not reliable; consequently, reliable
operation is not guaranteed under these circumstances.
7 Operation
7.1 Normal operation
When the letter "*R" appears on the display, this indicates that the system is operating normally.
When the letter "D" is displayed, this indicates that the system is adjusting the signal gain before
measurement. This also means that the system is operating normally. The letter "E" indicates that
no signal is detected. Check that the wiring connections of the sensors are correct, rmly installed,
etc. For more information, refer to "Troubleshooting".
7.2 Limit value for lowest ow rate
The value in M21 is the minimum value for the ow rate. If the ow falls below th value, the ow is
display will be set to zero. This feature can prevent the ow meter from displaying the ow as "0"
after a pump has been turned o but when there is still uid movement in the pipe, resulting in a
cumulative error. In general, it is recommended to enter 0.03 m/s as the minimum value for the
lowest ow. The limit value is not related to the measurement results once the velocity increases
above the limit value.
7.3 Zero setting
As soon as a zero ow occurs, a zero point is displayed on the ow meter but the displayed
measured value is not equal to "0", this value only indicates "zero". To any measuring instrument,
it applies that the smaller the zero point , the better the quality will be. If the zero point is too is
high, this means that the quality of the instrument is poor. If the zero set value is not at the true
zero flow, a measurement dierence may occur. The smaller the physical measurement capacity,
the greater the measurement dierence from the zero point. It is necessary to perform a zero
calibration to improve measurement accuracy at low ow. This can be done via the M22 menu.
Go to the "Cuto" submenu and select "Yes". The instrument will now start the zero calibration.
The device will indicate when zero calibration is complete.
© PCE Instruments
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7.4 Scaling factor
The scaling factor describes the relationship between the "actual value" and the "read value". For
example, if the reading is 2.00 and is indicated as 1.98 on the device, the scaling factor is 2/1.98.
This means that the best scaling factor is constant 1. However, it is dicult to keep the scaling a
factor "1" on the instrument, especially for serial measurements. During operation, there are still
possible dierences in pipe parameters, etc. The "scaling factor" may be required when the PCE-
TDS 75 is used for dierent pipes. Therefore, the scaling factor calibration is specically designed
to calibrate the dierences resulting from the application on dierent pipes. The scaling factor
entered must be the one resulting from the actual flow calibration. The scale factor can be entered
in window M26.
7.5 System lock
The system lock is intended to prevent operating errors due to tampering by unauthorized
personnel. M54 is the system lock menu which you can only unlock with the password you set.
When "Lock" is displayed, enter the correct password. Remember the password or keep it in a
safe place, otherwise the device can no longer be used.
7.6 Current loop output
With a current loop output, the ow meter is programmable and congurable with outputs such
as 4 mA or 0 mA. This can be selected in menu 32. For example, if the ow range is 0 –20 –20
... 1000 m3/h, enter 0 for "Range" and "LowerL" and 1000 for "UpperL". For "Mode", set 4-20 mA.
If the ow is within the range -1000 2000 m …3/h, select the 20 - - 20 mA output for "Mode". 4
Enter 1000 for "Range" and "LowerL" and 2000 for "UpperL". If the ow direction is relevant, the
0 4 - - 20 mA output is available. When the ow direction is indicated as negative, the current
output is with the range of 0 4 mA, wh the 4 20 mA is for the positive direction. The in …ereas …
options for the output mode are displayed in the M32 window under "Mode". Calibration and
testing of the current loop performed in the M32 window under "Check". Perform the steps as are
follows: "check 4mA", "check 8mA", "check 16mA", "check 20mA". Connect an ammeter to test
the current loop output and calculate the dierence. Calibration of the 4- mA output is possible 20
in menu M62.
7.7 Frequency output
The PCE-TDS 75 flow meter is equipped with a transmission function with frequency output. The
displayed high or low frequency output indicates the high or low ow rate reading. The user can
set both the frequency output and the ow rate according to their requirements E. g., if a pipe .
ow range is 0 ... 5000 m3/h, the required relative frequency output is 100 ... 1000 Hz. The
conguration is as follows:
• In window M33 "LowerL" (lower limit value of the output ow frequency), select "0";
• Select "5000" for "UpperL" (upper limit of output ow frequency );
• Select "Mode-Frange" and enter "100" and "1000";
• Select "Mode Option" and enter "a. Flow Rate";
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7.8 Totalizer pulse output
Each time the ow meter reaches a consistent ow, it can generate a totalizer pulse. The totalizer
pulse can be transmitted to a remote counter via OCT (Open Collector Transistor) or a relay.
Therefore, it is necessary to congure the OCT and relay accordingly (see windows M33 and
M34). For example, if it is necessary to transmit the positive totalizer pulse via a relay and each
pulse represents a ow of 10 m3, congure as follows:
• Open M41 and select the totalizer ow unit "m 3" ;
• go to M41-MULT and select the scaling factor "e. x10";
• in M34-Option, select "g. POS Total".
Attention!
Make sure to select a suitable totalizer pulse. If the totalizer pulse is too high, the
output cycle will be too long; if the totalizer pulse is too low, the relay will operate
too fast. You can shorten the life of the relay and skip some pulses. It is
recommended that the totalizer transmits within the range of 1 ... 3 pulses per
second.
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7.9 Alarm programming
The on-o alarm is generated by the OCT or by transmission to an external circuit by opening or
closing a relay. The on-o output signal is activated under the following conditions:
• Signal not detected.
• Bad signal detected.
• The ow meter is not ready for normal measurement.
• The ow is in reverse direction (backow).
• The analog outputs exceed the measuring span by 120 %. ue
• The frequency output exceeds the span by 120 %.
• The ow rate exceeds the congured ranges. Congure the ow ranges using the
software alarm system. There are two software alarms: alarm no. 1 and alarm no. 2.
Example 1: If the ow rate exceeds 300 ... 1000 m
3/h, follow these steps to program
the relay output alarm:
(1) In menu 35, set Alarm1 LowL to 300.
(2) In menu 35, set Alarm1 Upper to 1000.
(3) Select d. Alarm1 under Option in Menu 34.
7.10 4-20 mA analogue output calibration
Attention!
Each ow meter has been calibrated before leaving the factory. It is not necessary
to perform this step unless the current value (determined during current loop
calibration) displayed in the M32 window is not identical to the actual output
current value.
The hardware detection window must be activated before calibrating the analog output. To do ue
this, you must proceed as follows:
Open M62 for 4-20 mA calibration. Use "↑" and "↓" to toggle. Calibrate the 4 mA output of the
current loop. Use an ammeter to measure the current loop output current while adjusting the
numerical values until the ammeter reads 4.00. The 4 mA output value has been calibrated. now
Use "↑" and "↓" to toggle and calibrate the 20 mA output of the current loop. The method is the
same as for the 4 mA calibration. The results are automatically saved the EEPROM and are to
not lost even when the power is turned o.
7.11 ESN
We equip the ow meter with a unique electronic serial number to identify each ow meter for the
benet of the manufacturer and customers. The ESN, device types and versions can be viewed
in window M50.
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8 Explanation of the menu windows
8.1 Display overview
Short explanation
Menu window
M0X
Display values and conditions
M00 Totalizer for ow values
M01 Flow rate
M04 Status
M1X
Installation settings
M10 Pipe settings
M11 Pipe lining parameters
M12 Medium parameters
M13 Sensor settings
M14 Sensor spacing indicator
M2X
Calibration settings
M20 Damping
M21 Minimum ow cuto value
M22 Zero setting
M23 Counter
M25 Power-o compensation switch
M26 K factor
M27 Correction
M28 Statistical analysis
M3X
Input and output settings
M30 Interface parameters
M31 Analog input settings ue
M32 Current loop mode settings
M33 OCT settings
M34 Relay settings
M35 Alarm value setting
M4X
Flow unit
M40 Switch unit system
M41 Flow unit
M5X
System settings
M50 Serial number
M51 Date and time
M52 Key tone
M53 Language settings
M54 System lock
M55 System reset
M6X
Others
M60 Date and time setting
M61 Timer
M62 Calibration adjustment
M64 Analog input adjustment ue
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8.2 Menu window explanation
M00
Totalizer for ow values
Display net volume
Display positive value
Display negative value
Use "↑"and "↓" to switch between
the submenus.
M01
Flow rate
Displays the ow rate and the
absolute ow.
Displays the velocity.
Flow rate and velocity change
every 6 seconds.
Press ENTER to pause the
change.
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M04
Status
The inlet direction signal strength
and the outlet direction signal
strength are displayed. The signal
quality Q is indicated as 00 ... 99. 00
represents the worst signal while 99
represents the best signal. Normally,
the signal quality Q value should be
above 60.
Display of the measured liquid sound
velocity. Normally, this value should
be approximately equal to the value
entered in window M12. If the
dierence is too large, this is
probably due to an incorrect value
entered in window M12 or improper
installation of the sensors.
Displays the measured and the
calculated transmission time. The
dierence should be as small as
possible. The ratio should be a
maximum of 100 ±3 If the %.
dierence is too large, check that the
parameters have been entered
correctly, especially the sound
velocity of the liquid.
Displays the measured ultrasonic
averaging time (unit: µs) and the
delta time of the upstream and
downstream time (unit: ns). The
velocity calculation in the ow meter
is based on the two measured
values. The delta time is the best
indication of whether the device is
running stably. Normally, the
variation of the delta time should be
less than 20 %. If this is not the
case, check whether the sensors are
installed correctly or whether the
parameters have been entered
correctly.
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M10
Tube settings
Here you can enter the outer pipe
diameter. The outer pipe diameter
must be within the range of 10 …
1200 mm.
Notice:
Enter either the outer pipe diameter
or the pipe outer perimeter. Enter the
pipe wall thickness. The pipe wall
thickness is required.
Enter the pipe material.
The following options are available:
0. PVC
1. CS (carbon steel)
2. SSP (stainless steel pipe)
3. CIP (cast iron pipe)
4. DIP (ductile cast iron pipe)
5. C opper
6. Alu. (Aluminum)
7. ACP (asbestos cement pipe)
8. FGP (berglass pipe)
9. Other
It is possible to enter other materials
not included in the previous eight
items. Once item 9 is selected, the
relevant pipe sound velocity must be
entered.
M11
Coating
Enter the thickness of the liner.
Select the liner material.
The following options are available:
0. N liner o
1. Tar epoxy
2. R ubber
3. Mortar
4. PP polypropylene
5. Polystyr ol
6. PS polystyrene
7. Polyester
8. PE polyethylene
9. Ebonite
10. Teon
11. Other
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Item 11 "Other" is available to enter
other materials not included in the
previous ten items. Once "Other" is
selected, the appropriate sound
velocity of the liner must be entered.
M12
Medium
Select the water temperature. The
temperatures should be 0 ... 80 °C.
Press ENTER to conrm.
M13
Sensors
Here you can select the sensor type.
The following options are available:
0. Clamp-on C
1. Clamp-on D
2. Clamp-on X
3. Plus-in
4. Plus-in X
Here you can select the sensor
mounting method.
Two mounting methods are
available:
0. V (Reect) method
1. Z (Direct) method
M14
Installation spacing
This value is calculated by the PCE-
TDS 75. The user must mount the
sensors according to the displayed
sensor spacing (make sure that the
sensor spacing is measured
accurately during installation). The
system will automatically display the
data after the pipe parameter is
entered.
© PCE Instruments
22
M20
Damping
The damping factor ranges from 1 to
999 seconds. 1 means no damping;
999 means maximum damping. The
damping function stabilizes the ow
display. Typically, a damping factor
of 3 to 10 is recommended for
applications.
M21
Low Vel. Cuto
The low ow cutoff is used to make
the system display 0 at minimum
ow. For example, if the minimum
value is set to 0.03, the system will
regard all measured ow rate values
from -0.03 to + 0.03 as "0". In
general, a value of 0.03 is
recommended for most applications.
M22
Zero Settings
When the uid is in a static state, the
displayed value is called zero point.
If the zero point in the ow meter is
not zero, the difference is added to
the actual ow values and
measurement differences occur in
the ow meter.
The zero point must be set after the
sensors are installed and the ow in
the pipe is in absolute static condition
(no uid movement in the pipe). In this
way, the zero point resulting from
dierent pipe mounting locations and
parameters can be eliminated. This
increases the measurement accuracy
at low ow and eliminates the ow
oset.
Select "Yes"; reset the zero point set
by the user.
© PCE Instruments
23
This method is not frequently used.
The zero point should only be
adjusted when all other methods do
not lead to a solution. Manually enter
the value you wish to add to the
measured value to obtain the actual
value.
For example
Actual measured value m＝240 3/h
Value deviation m＝250 3/h
Flow meter display m＝250 3/h
Normally, the value is set to "0". Use
"↑" and "↓" to toggle.
M23
Counter
Select the counter type
0. POS (positive counter)
1. NEG (negative counter)
2. NET
Select the value of the ow totalizer
that you want to reset to 0.
0. POS positive counter
1. NEG negative counter
2. NET
3. A ll
M25
Power-o - mpensation ff co
The automatic power-o
compensation switch feature allows
the ow rate lost in an oine session
to be estimated and automatically
adjusted. The estimate is based on
the average of the ow rate before
the oine session and the measured
ow rate after the next online
session, multiplied by the time the
meter was oine. Select "ON" to use
this feature; select "OFF" to not use
this feature.
© PCE Instruments
24
M26
K Factor
The calibration factor is used to
modify the measurement results.
The user can enter a numerical
value (except "1") according to the
actual calibration results.
M27
Correction
KArray
Sectional correction
ON: opening the sectional correction
OFF: closing the sectional correction
For the "Delay submenu, you "
should use the factory settings.
TPC
Transducer power control
Use the factory setting.
0. Auto
1. Low
2. High
M28
SQA
Statistical analysis
© PCE Instruments
25
M30
RS232/RS485
Setting the serial interfaces
. 2400 None
. 4800 None
. 9600 None
. 19200 None
. 38400 None
. 56000 None
You can set the order as follows:
a. 1-0 : 3- 2
b. 0-1 : 2- 3
c. 3-2 : 1- 0
d. 2-3 : 0-1
M31
AI Settings
Display analog value of analog ue ue
input AI1.
Display analog value of analog ue ue
input AI2.
© PCE Instruments
27
Select the value for the OCT range.
OCT check options :
a. Check 500
b. Check 1000
c. Check 3000
d. Check 5000
© PCE Instruments
28
M34
Relay Settings
The following signal options are
available:
a. No Signal
b. *E
c. Reverse
d. Alarm1
e. Alarm2
f. Ration
g. POS Total
h. NEG Total
i. NET Total
j. Not using
M35
Alarm setting
Enter the lower alarm value;
Any measured ow lower than the lower
value will activate the alarm in the OCT
or relay output.
Enter the upper limit alarm value;
any measured flow higher than the
upper value will activate the alarm in
the OCT or relay output.
M40
Toggle Unit
Select the measuring unit as follows:
a. Metric
b. British
© PCE Instruments
29
M41
Flow Unit
The following ow rate units are
available:
0. Cubic Meters (m 3)
1. Liters (l)
2. USA Gallons (GAL)
3. Imperial Gallons (Imp gal)
4. Million Gallons (mg)
5. Cubic Feet (cf)
6. USA Barrels (US bbl)
7. Imperial Barrels (Imp bbl)
8. O Barrels (Oil bbl) il
The following time units are available:
/Day /Hour
/Min /Sec
The factory setting is cubic meters/hour.
You can set a dierent time factor using
the following chart:
a. x 0.001 (E- 3)
b. x 0.01 - (E 2)
c. x 0.1 - (E 1)
d. x 1 (E+0)
e. x 10 (E+1)
f. x 100 (E+2)
g. x 1000 (E+3)
h. x10000 (E+4)
M42
Energy Unit
The following energy units can be selected
0 Giga Joule (GJ) .
1 Kilocalorie (Kc) .
2 MBtu .
3. KJ
4 Btu .
5. KWh
6 MWh .
7 . TH
© PCE Instruments
30
a. x 0.001 (E- 3)
b. x 0.01 - (E 2)
c. x 0.1 - (E 1)
d. x 1 (E+0)
e. x 10 (E+1)
f. x 100 (E+2)
g. x 1000 (E+3)
h. x10000 (E+4)
© PCE Instruments
31
M43
Temperature Unit
a. °C
b. °F
Use "↑"and "↓" to change the unit.
M50
Serial Number
The serial number (S/N) of the
device is displayed here. The S/N is
unique.
M51
Time and date
Date and time changes are made in
this menu.
M52
Key T one
Use this menu to switch the key tone
on or o ("ON" / "OFF").
© PCE Instruments
32
M53
Language setting
Here you can set the language.
M54
System Lock
Here, you have the possibility to lock
the ow meter by a password. Once
the system is locked, any change to
the system is blocked, the parameter
remains readable. The correct entry
of the set password is the only way
to unlock the system The password .
consists of 6 digits.
M55
System reset
Select 1. Reset to reset the device to
factory settings.
Select the boot screen menu.
M60
Data Totalizer
The following options are available:
0. D ay
1. Month
2. Y ear
In this window, it is possible to review
the historical ow data net totalizer of
each day for the last 31 days, each
month for the last 12 months and
each year for the last 6 years.
M61
Running Time
With this function it is possible to
display the total number of operating
days since the ow meter left the
factory.
© PCE Instruments
33
M62
CL Adjustment
This menu is for the 4-20 mA
calibration. Enter the password to
adjust.
M63
RTD Adjustment
This menu is used for the RTD
calibration. Enter the password to
adjust.
M64
AI Adjustment
This menu is for calibration of the
analog input. Enter the password ue
to adjust.
© PCE Instruments
34
9 Troubleshooting
The PCE-TDS 75 has advanced self-diagnostic functions and displays any errors in the upper
right corner of the LCD screen via unique codes in date/time order. Errors caused by improper
operation, incorrect settings and unsuitable measurement conditions can be displayed
accordingly during operation. This function helps the user to detect errors and nd the causes
quickly. Thus, problems can be solved promptly according to the following chart. If a problem
cannot be solved, contact PCE Instruments.
9.1 Error codes during operation
Codes
Causes
Solutions
*R
The system is running
normally.
*E
- Signal not detected.
- The distance between the
sensors is not correct or not
enough coupling gel has
been applied to the sensors.
- The sensors are not
installed correctly.
- The wall is too thick.
- The thickness of the pipe
liner was incorrectly
specied.
- Attach the sensors to the
pipe and tighten them rmly
with the clamps. Apply a
generous amount of
coupling gel to the sensors
and the pipe wall.
- Remove rust or loose paint
from the pipe surface. Clean
it thoroughly.
- Check the entered
parameter settings.
- Select a new pipe section.
The instrument may be run
properly in a new location.
- Wait after setting the
parameters again. Normally,
the device should function
normally afterwards.
*D
Adjusting gain for
normal measurement
© PCE Instruments
35
9.2 Frequently asked questions
Question:
New pipe and all installation requirements are met: Why is still no signal detected?
Help:
Check the pipe parameter settings, installation method and wiring connections. Make sure that
sucient coupling gel has been applied, the pipe is lled with uid, the distance between the
sensors matches the value displayed in M14 and the sensors are installed in the correct direction.
Question:
Old pipe with contamination inside, no or bad signal detected: How to solve the problem?
Help:
Check that the pipe is lled with fluid. Try the Z method for installing the sensors. Carefully select
a good section of pipe and clean it completely, apply enough coupling gel to each sensor face
and install the sensors properly. Slowly and carefully move each sensor against each other
around the installation point until maximum signal is achieved. Make sure that the new installation
point inside the pipe is not contaminated and that the pipe is concentric (not distorted) so that the
sound waves are not reected outside the intended area.
Question:
Why is the CL output (current l m normal? oop ode) ab
Help:
Check whether the output mode is set correctly in window M32 under "Mode". Check whether the
maximum and minimum current values are set correctly in window M32 under "Range".
Recalibrate the current loop and check this in window M32 under "Check".
Question:
Why is the ow rate still displayed as zero even though there is obviously uid in the pipe and the
"R" symbol is displayed on the screen?
Help:
Check whether the "zero setting" was performed when the ow was not zero (see window M22).
If this is the case, restore the factory setting in window M22-Reset.
Tuotetiedot
| Merkki: | PCE Instruments |
| Kategoria: | Mittauslaitteet |
| Malli: | PCE-TDS 75 |
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