Micronics U1000MkII WM User manual

U1000MkII WM
U1000MKII-WM:Wall-Mounted Ultrasonic Flow Meter
U1000MKII-HM:Wall-Mounted Ultrasonic Heat Meter
User Manual
Micronics Ltd, Knaves Beech Business Centre,
Davies Way, Loudwater, High Wycombe, Bucks HP10 9QR
Telephone: [phone] E-mail: [e-mail]
www.micronicsflowmeters.com

Micronics U1000MKII WM User Manual
Issue 2.0 Nov 2022 Page i
DOCUMENT AUTHORITY
Issue
2.0
Originator
Micronics Ltd
Checked
Approved
Date
12/12/2022

Micronics U1000MKII WM User Manual
Issue 2.0 Nov 2022 Page i
CONTENTSS
1INTRODUCTION ..................................................................................................................................................4
1.1 General Description............................................................................................................ 4
1.2 How Does It Work?............................................................................................................. 5
1.3 Package Contents .............................................................................................................. 6
1.4 Display................................................................................................................................ 7
1.5 Quick Start Procedure ........................................................................................................ 8
1.6 Output and Communication Options ................................................................................... 8
2INSTALLATION....................................................................................................................................................9
2.1 Positioning.......................................................................................................................... 9
2.1.1 Additional Considerations for Locating Heat Meter versions ...................................... 10
2.1.2 Clean the Pipe’s Flow Sensor Contact Area .............................................................. 10
2.2 Connect Power and Signal Cables ................................................................................... 11
2.2.1 Power Supply ............................................................................................................ 11
2.2.2 Guiderail/Flow Sensors.............................................................................................. 11
2.2.3 PT100 Sensors (Heat Meter versions only) ............................................................... 11
2.2.4 Pulse Output Connection........................................................................................... 12
2.2.5 Current Output (if fitted) ............................................................................................. 12
2.2.6 Modbus/M-Bus Connections (if fitted) ........................................................................ 13
2.3 Switch On ......................................................................................................................... 14
2.3.1 U1000MkII WM Flow Meter ....................................................................................... 14
2.3.2 U1000MkII WM Heat Meter ....................................................................................... 15
2.4 Assemble the Guiderail..................................................................................................... 16
2.5 Adjust Flow Sensor Separation......................................................................................... 16
2.6 Apply Gel Pads................................................................................................................. 16
2.7 Clamp Guiderail to Pipe.................................................................................................... 16
2.8 Calibrate the PT100 Temperature Sensors (Heat Meter versions only) ............................ 17
2.9 Attach the PT100 Sensors (Heat Meter versions only)...................................................... 17
2.10 Zero offset the Flow Sensors ............................................................................................ 18
2.11 Normal Operation ............................................................................................................. 18
2.11.1 U1000MkII-WM Flow Meter ....................................................................................... 18
2.11.2 U1000MkII-WM Heat Meter ....................................................................................... 19
2.12 Totals and Rollover........................................................................................................... 19
2.13 Troubleshooting the Flow Reading ................................................................................... 20
2.14 Resetting the Flow Direction ............................................................................................. 21
3MENUS ...............................................................................................................................................................21
3.1 Accessing the Menus........................................................................................................ 22
3.2 Setup Menu ...................................................................................................................... 23
3.2.1 Pipe Characteristics................................................................................................... 23

Micronics U1000MKII WM User Manual
Issue 2.0 Nov 2022 Page ii
3.2.2 Fluid Characteristics .................................................................................................. 23
3.2.3 System Units ............................................................................................................. 24
3.2.4 Instrument Configuration ........................................................................................... 24
3.2.5 Separation Distance .................................................................................................. 25
3.3 Current Output Menu ........................................................................................................ 25
3.4 Modbus Setup Menu......................................................................................................... 25
3.5 M-Bus Setup Menu........................................................................................................... 26
3.6 Pulse Output Menu........................................................................................................... 27
3.6.1 Volume Pulse ............................................................................................................ 27
3.6.2 Flow Alarm ................................................................................................................ 27
3.6.3 Energy Pulse (Heat Meter versions only)................................................................... 28
3.6.4 Frequency ................................................................................................................. 28
3.7 Calibration Menu .............................................................................................................. 28
3.8 Volume Totals Menu......................................................................................................... 29
3.8.1 Volume Totals Reset ................................................................................................. 29
3.8.2 Totals Format Type ................................................................................................... 29
3.9 Diagnostics Menu ............................................................................................................. 30
4OUTPUTS ...........................................................................................................................................................31
4.1 Pulse Output..................................................................................................................... 31
4.1.1 Volumetric Pulse........................................................................................................ 31
4.1.2 Frequency Mode........................................................................................................ 32
4.1.3 Energy Pulse ............................................................................................................. 32
4.1.4 Alarm......................................................................................................................... 32
4.2 4–20mA Current Output - Optional ................................................................................... 32
4.3 Modbus - Optional ............................................................................................................ 33
4.4 M-Bus - Optional............................................................................................................... 33
5DEFAULT VALUES AND ERROR CODES..........................................................................................................34
5.1 Defaults ............................................................................................................................ 34
5.2 Error and Warning Messages ........................................................................................... 34
5.2.1 Error Messages ......................................................................................................... 34
5.2.2 Example Error Messages .......................................................................................... 35
5.2.3 Modbus Error Messages (if Modbus fitted) ................................................................ 35
5.2.4 Flow Errors ................................................................................................................ 35
5.2.5 Flow Warnings........................................................................................................... 36
5.2.6 Data Entry Errors....................................................................................................... 36
6APPENDIX.........................................................................................................................................................37
6.1 Specification ..................................................................................................................... 37
7FIXING AND ENCLOSURE DIMENSIONS........................................................................................................39

Micronics U1000MKII WM User Manual
Issue 2.0 Nov 2022 Page iii
8DECLARATION OF CONFORMITY.....................................................................................................................40
Figure 1: Principle of Transit-Time operation .................................................................................... 5
Figure 2: Package Contents..............................................................................................................6
Figure 3: U1000MKII WM display (Heat Meter model shown) ...........................................................7
Figure 4: Location of unit ..................................................................................................................9
Figure 5: Typical setup of U1000MkII-WM Heat Meter for boiler applications ................................. 10
Figure 6: Terminal blocks and connectors....................................................................................... 11
Figure 7: U1000MKII WM Heat Meter PT100 Temperature Probe Wiring .......................................12
Figure 8: Fully assembled U1000MkII-WM Heat Meter unit ............................................................ 17
Figure 9: Volume / Energy Pulse Width .......................................................................................... 31
Figure 10: Default 4–20mA values.................................................................................................. 32

Issue 2.0 Nov 2022 Page 4
1INTRODUCTION
1.1 General Description
This manual describes the installation and use of the two models in the U1000MkII WM range:
•U1000MkII WM Flow Meter is a wall-mounted control unit with a clamp-on ultrasonic flow
sensors for measuring flow rate and total flow with a volume pulse output. It can be used as a
standalone meter or as part of an integral management system.
•U1000MkII WM Heat Meter is a wall-mounted control unit with a clamp-on ultrasonic flow
sensors and separate pair of PT100 thermal sensors. It uses ultrasound to measure flow rate
and is also equipped with PT100 temperature sensors to measure flow and return
temperatures. The U1000MKII WM Heat Meter displays energy rate and totalised energy with
pulse output and communication options, so it can be used as a standalone meter or as an
integral part of Automatic Monitoring & Targeting (aM&T) or a Building Energy Management
System (BEMS).
The ultrasonic flow sensor attaches to the pipe using the supplied hose clips. The sensors operate
on mild steel, stainless steel, copper, and plastic pipes with internal diameter in the range 20 mm
(0.8”) to 110 mm (4.3”), or 105 mm (4.1”) to 215 mm (8.5”) depending on the product purchased.
The wall-mounted electronics and control unit requires an external 12–24 VDC or 24 VAC power
supply (7 VA minimum), optionally supplied.
Both models can be supplied as pulse output only units, Pulse O/P is always present, or with
optional 4–20mA flow proportional output, and/or Modbus, M-Bus or BACnet Communication
Options.
Typical applications:
U1000MkII WM Flow Meter
U1000MkII WM Heat Meter
Hot water metering and flow measurement
Hot water metering and flow measurement
Flow measurement for heat metering
Flow measurement for Energy Metering
Chilled water metering and flow measurement
Chilled water metering and flow measurement
Potable water metering and flow measurement
Process water metering and flow measurement
Ultra-pure water metering and flow
measurement.
NOTE:
U1000MkII WM Heat Meter units are preconfigured as follows:
•Instrument Type: Heating
•Installation: Flow
•Fluid: Water
Flow and Return refer to the location of the flow measurement relative to flow circuit.

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1.2 How Does It Work?
The U1000MKII WM uses a cross correlation transit time algorithm to provide accurate flow
measurements.
An ultrasonic beam of a given frequency is generated by applying a repetitive voltage pulse to the
transducer crystals. This transmission goes first from the downstream transducer to the upstream
transducer as shown in the upper half of Figure 1. The transmission is then made in the reverse
direction, being sent from the upstream transducer to the downstream transducer as shown in the
lower half of Figure 1. The speed at which the ultrasound is transmitted through the liquid is
accelerated slightly by the velocity of the liquid through the pipe. The subsequent time difference
T1-T2 is directly proportional to the liquid flow velocity.
With Heat Meter models, two temperature sensors measure the difference in temperature between
the flow and return of the flow system being monitored. The temperature difference, in combination
with the volume of water that has flowed through the system, is then used to calculate the energy
transferred to or from the water.
Figure 1: Principle of Transit-Time operation

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1.3 Package Contents
The unit consists of:
1. Wall-mounted electronics and control unit
Consisting of the keypad with display, power, communications, and sensor connections.
2. Ultrasonic Flow Sensors
Two transducers for flow measurement with VHB gel pads to ensure good contact with
pipework.
In addition, the kit contains (see Figure 2: Package Contents):
3. Guide rail
4. Heat Meter versions only: Non–releasable stainless-steel cable ties for temperature sensors
and cables (4)
5. Quick release clamps for use with pipes with an OD of 25–70 mm (p/n 225-5007)
or 51–127 mm (2) (p/n 225–5001)
6. Heat Meter versions only: PT100 temperature sensors with 3 m cable (2)
7. 12 V power supply and adapters (optionally supplied).
Figure 2: Package Contents

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1.4 Display
The U1000MKII WM display comprises:
•One 2–line x 16-character LCD with backlight
•Four tactile key switches
•Two LEDs
Figure 3: U1000MKII WM display (Heat Meter model shown)
1. The front panel will indicate “Energy” (shown here) or “4–20mA” for HM or FM variants
respectively.
Energy (1.)
(Heat Meter versions)
Energy pulse signal
active
4–20mA
(Flow Meter versions)
4–20mA signal active.
Pulse
Illuminated when the
Pulse, Frequency or
Alarm functions are
enabled.
Select
Selection key.
Choose between
options on the
display.
Decrease/Down
Decrement the
value of each
digit in numeric
entry fields.
Increase/Up
Increment the
value of each
digit in numeric
entry fields.
Enter
Enter displayed
selection/
terminate the
data entry.
Select menu or
exit to Flow
Reading screen.
Flow
Measured flow.
Signal strength
For accurate
results, must be
over 40%.
Flow Units
Units applicable to
measured flow.
Flow Direction
* Indicates positive
flow
! Indicates
reversed flow.

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1.5 Quick Start Procedure
The following procedure summarises the steps required to set up the U1000MkII WM. Please refer
to the referenced sections for full details.
1. Identify a suitable location for the sensors and guide rail on a straight length of pipe clear of
bends and valves or similar obstructions (See Section 2.1 Positioning). Make a note of the pipe
internal diameter, wall thickness and material at this point.
2. Connect the wall-mount electronics unit:
a. Fix the unit to a convenient location on a wall within 5 m of the pipe location.
b. Connect to a 12–24 VDC or 24 VAC power supply (7 VA minimum per instrument) -
See Section 2.2.1 Power Supply.
c. Switch on and program to determine the correct sensor separation (See Section 2.3
Switch On).
3. Attach the flow sensors and guide rail:
a. Set the flow sensors to the correct separation (see Section 2.5 Adjust Flow Sensor
Separation).
b. Apply the gel pads to the sensors (see Section 2.6 Apply Gel Pads).
c. Mount the sensor and guide rail assembly onto the pipe using the supplied clamps
(see Section 2.7 Clamp Guiderail to Pipe).
4. Connect the sensors to the wall-mounted electronics unit (see Section 2.2 Connect Power and
Signal Cables).
5. Heat Meter versions only: Connect the PT100 temperature sensors to the electronics unit (see
Section 2.2.3) and attach to the flow and return pipes (see Section 2.1).
6. Check that flow readings can be obtained (see Section 2.11 Normal Operation).
7. Check meter flow readings at physical zero flow. If there is a Measured Flow then consider
zeroing the sensors see section 3.7 Calibration Menu.
1.6 Output and Communication Options
The Wall Mount may have up to 2 modules present; from a 4–20mA or a Comms module which are
M-Bus Modbus or BACnet. See the relevant sections.
The comms modules M-Bus, Modbus and BACnet now have separate documents.
To configure a Pulse Output option, see Section 2.2.4 Pulse Output Connection.
To configure the 4–20mA Output, see Section 2.2.5 Current Output (if fitted).
To configure the Modbus interface, see Section 2.2.6 Modbus/M-Bus Connections (if fitted). The
address, data rate, and configuration of the instrument must be set using the Modbus Menu (see
Section 3.4 Modbus Setup Menu). The default address is 1, the default data rate is 38400 baud,
and the default Comms configuration is 8-None-2.
To configure M-Bus communication, see Section 2.2.6 Modbus/M-Bus Connections (if fitted). The
primary and secondary addresses must be set using the M-Bus Menu (see Section 3.5 M-Bus
Setup Menu). The message format may need to be changed to match the Master Controller (BMS
etc), see M-Bus manual.

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2INSTALLATION
2.1 Positioning
For accurate measurements, the U1000MKII WM guide rail and sensors must be installed at a
position where the fluid flows uniformly. Flow profile distortions can result from upstream
disturbance such as bends, tees, valves, pumps, and other similar obstructions. To ensure a
uniform flow profile, the unit must be mounted away from any cause of flow disturbance.
As a guide, we suggest this is best achieved by ensuring there is a straight length of pipe upstream
of the transducers of at least 10 times the pipe diameter, and 5 times the pipe diameter on the
downstream side, as shown in Figure 4: Location of unit, but this may vary. Flow Measurements can
be made on shorter lengths of straight pipe, but when the transducers are mounted this close to any
obstruction the resulting errors can be unpredictable.
Figure 4: Location of unit
To obtain the most accurate results, the condition of both the liquid and the pipe must be suitable to
allow ultrasound transmission along the predetermined path.
In many applications, an even flow velocity profile over a full 360° is unattainable due, for example,
to the presence of air turbulence at the top of the flow and possibly sludge at the bottom of the pipe.
Experience has shown that the most consistently accurate results are achieved when the sensors
are mounted at 45° with respect to the top of the pipe. In chiller applications, the U1000MKII WM
UPSTREAM
10 x pipe
diameter
DOWNSTREAM
5 x pipe
diameter
Uniform Flow Profile
Distorted Flow Profile
45°
Air
Sludge

Issue 2.0 Nov 2022 Page 10
sensor/electronics must be mounted at 45° with respect to the top of the pipe to prevent
condensation entering the electronics unit.
IMPORTANT: DO NOT EXPECT TO OBTAIN ACCURATE RESULTS IF THE SENSORS ARE
POSITIONED CLOSE TO ANY OBSTRUCTION THAT DISTORTS THE UNIFORMITY OF THE
FLOW PROFILE. MICRONICS LTD ACCEPTS NO RESPONSIBILITY OR LIABILITY IF
PRODUCT HAS NOT BEEN INSTALLED IN ACCORDANCE WITH THESE INSTRUCTIONS.
2.1.1 Additional Considerations for Locating Heat Meter versions
For optimum reliability on boiler applications, the flow measurement needs to be made on the cold
side of the system. For optimum reliability in chiller applications, the flow measurement needs to be
made on the warmer side of the system.
Figure 5: Typical setup of U1000MkII-WM Heat Meter for boiler applications
2.1.2 Clean the Pipe’s Flow Sensor Contact Area
Prepare the pipe by degreasing it and removing any loose material or flaking paint to obtain the best
possible surface. A smooth contact between pipe surface and the face of the sensors is an
important factor in achieving a good ultrasound signal strength and therefore maximum accuracy.
Heat Meter versions: The area of pipe where the temperature sensors are to be attached must be
free of grease and any insulating material. It is recommended that any coating on the pipe is
removed so that the sensor has the best possible thermal contact with the pipe.

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2.2 Connect Power and Signal Cables
This section explains how to connect power and signal cables to the terminal blocks inside the wall
mount unit.
Power PT100 Sensors 4–20mA Pulse Modbus/M-BUS Flow Sensors
Figure 6: Terminal blocks and connectors
2.2.1 Power Supply
The U1000MKII WM will operate within the voltage range 12–24 VDC or 24 VAC. Micronics can
supply, as an optional item, a 24 VAC power supply. If you intend to use an alternative power
supply, it must have a minimum rating of 7 VA per instrument. Connect the power supply to the left-
hand terminal block labelled +VIN, -VIN and Screen.
EXTERNAL POWER SUPPLY MUST BE CLASS 2 RATED.
IMPORTANT: IT IS THE RESPONSIBILITY OF THE INSTALLER TO CONFORM TO THE
REGIONAL VOLTAGE SAFETY DIRECTIVES WHEN CONNECTING THE U1000MKII WM TO A
POWER SUPPLY USING A MAINS-RATED TRANSFORMER.
2.2.2 Guiderail/Flow Sensors
Connect the flow sensors to pins J1 and J3 using the attached 5 m cables.
2.2.3 PT100 Sensors (Heat Meter versions only)
Connect the two PT100 temperature sensors to the terminal blocks labelled RTDA and RTDB using
the attached 4-core, 5 m cables, as shown in Figure 7. Do not fasten the probes to the pipework
until you have carried out the calibration (see Section 2.8 Calibrate the PT100 Temperature Sensors
(Heat Meter versions only)).

Issue 2.0 Nov 2022 Page 12
Figure 7: U1000MKII WM Heat Meter PT100 Temperature Probe Wiring
2.2.4 Pulse Output Connection
The isolated pulse output (labelled PULSE-A and PULSE-B) is provided by a SPNO/SPNC MOSFET
relay which has a maximum load current of 500 mA and maximum load voltage of 48 VAC.
The relay also provides 2500 V isolation, between the unit’s electronics and external equipment.
This output is suitable for SELV circuits only
Electrically this is a Volt, or potential free contact and, when selected as a low flow alarm, is
configurable NO/NC.
2.2.5 Current Output (if fitted)
U1000MkII WM unit can be optionally configured with a 4–20mA output. The isolated 4–20mA is a
current source and can drive into a maximum load of 600Ω.
If fitted, the 4–20mA current outputs are available at the terminal block labelled IO0 4–20mA with
RET and OUT connections. The alarm current due to a flow outside the range specified or due to a
loss of signal is set at 3.5 mA.
This output is suitable for SELV circuits only

Issue 2.0 Nov 2022 Page 13
2.2.6 Modbus/M-Bus Connections (if fitted)
For detailed instructions see the separate manuals
If fitted, the Modbus or M-BUS output is available at the terminal blocks labelled IO1 1/01-04
terminals:
IO1 Terminal
Modbus
M-BUS
IO4
ISOL_GND
ISOL_GND
IO3
OUT_A
BUS1_IN
IO2
ISOL_GND
ISOL_GND
IO1
OUT_B
BUS2_IN
For reliable operation of a Modbus network the cable type and installation must comply with
requirements in the Modbus specification document:
“MODBUS over Serial Line Specification & Implementation guide V1.0”:
https://modbus.org/docs/Modbus_over_serial_line _V1.pdf
For full immunity to electrical interference the screen of the power/pulse output cable and Modbus
cable should be connected to Earth.
For reliable operation of an M-bus network the cable type and installation must comply with
requirements in the M-bus specification document:
“Meter Communication Twisted Pair Baseband (M-Bus) Physical and Link Layer”:
https://m-bus.com/assets/downloads/MBDOC48.PDF
This output is suitable for SELV circuits only

Issue 2.0 Nov 2022 Page 14
2.3 Switch On
The initial screen sequence is different for the Flow Meter and Heat Meter models.
The screens shown here are for Metric, the operation for Imperial is the same.
2.3.1 U1000MkII WM Flow Meter
Switch on the power to the Electronics Module. A Micronics start-up screen is displayed for five
seconds followed by hardware and software version information.
If Imperial is configured, then the displays will reflect equivalent values and Imperial units.
Select the pipe material by using the and
keys
to scroll through the list.
Press to confirm the material.
You are then prompted to enter the internal diameter of
the pipe:
Use the , and keys to change the value.
Press to confirm the value.
Enter the wall thickness of the pipe:
Use the , and keys to change the value.
Press to confirm the value.
Select the fluid using and . Options are Water
Glycol Ethanol.
Press to confirm the fluid name.
With Glycol or Ethanol Next enter the %age
Either Select the %age of Ethanol.
Or Select the %age mix of Glycol.
Enter the temperature of the fluid.
Allowed range -20.0–140.0 °C (-4.0–284.0 °F).
Do not set outside the implied fluid ranges.
Pipe Material:
PLASTIC
Enter Pipe ID:
050.0 mm
Wall Thickness:
004.35 mm
Instrument Fluid
Water
Ethanol %age:
10 %
Glycol %age:
30/70 %
Temperature:
+020.0 °C

Issue 2.0 Nov 2022 Page 15
The unit now shows the correct flow sensor separation
(in this case, 12.4 mm) for the chosen values of pipe ID,
pipe material and fluid.
Make a note of the separation distance.
All subsequent start-ups will use the same configuration. If the configuration needs to be changed
for any reason, use the password-controlled menu (see section 0 If the flow sense here is flipped.
Then a reverse flow will change to a positive flow “*”.
From Main Flow Display press and hold the
then Press the key. Next Screen
Displays.
Menus).
Continue with the installation of the Sensor Assembly (see section 2.4 Assemble the Guiderail).
2.3.2 U1000MkII WM Heat Meter
Switch on the power to the Electronics Module. A Micronics start-up screen is displayed for 5
seconds followed by hardware and software version information.
If Imperial is configured, then the displays will reflect equivalent values for Imperial units.
Select the pipe material by using the and
keys to scroll through the list.
Press to confirm the material.
You are then prompted to enter the internal diameter of
the pipe:
Use the , and keys to change the value.
Press to confirm the value.
Enter the wall thickness of the pipe:
Use the , and keys to change the value.
Press to confirm the value.
Select the fluid using and .
Option are Water Glycol Ethanol.
Press to confirm the fluid name.
With Glycol or Ethanol Next enter the %age
Either Select the %age of Ethanol.
Set Separation:
12.4mm
Sig: 87% *
246.3 l/min
Pipe Material:
PLASTIC
Enter Pipe ID:
050.0 mm
Wall Thickness:
004.35 mm
Instrument Fluid
Water
Ethanol %age:
10 %

Issue 2.0 Nov 2022 Page 16
Or Select the %age mix of Glycol.
Enter the Fluid temperature
Allowed range:
-20.0–140.0 °C (-4.0–284.0 °F).
Select the Instrument Type using .
The unit is preconfigured for Heating applications.
Press to confirm the setting.
Select the Instrument Side (where flow sensors are
installed) using .
The unit is preconfigured for Flow.
Press to confirm the setting.
The unit now shows the correct flow sensor separation
(in this case, 12.4 mm) for the chosen values of pipe ID,
pipe material and fluid.
Make a note of the separation distance.
All subsequent start-ups will use the same configuration. If the configuration needs to be changed
for any reason, use the password-controlled menu (see section 3.2).
Continue with the installation of the Sensor Assembly (see section 2.4 Assemble the Guiderail).
2.4 Assemble the Guiderail
Slide the guiderail through the slot on the top of the two transducers.
2.5 Adjust Flow Sensor Separation
Using the separation distance displayed by the control unit (see 2.3 Switch On), adjust the
transducer separation accordingly. Fasten the sensors to the correct position on the guiderail using
the thumbscrews.
2.6 Apply Gel Pads
1. Apply a gel pad centrally onto the bases of each of the two flow transducers.
2. Remove the covers from the gel pads.
3. Ensure there are no air bubbles between each pad and sensor base.
Glycol %age:
30/70 %
Temperature:
+020.0 °C
Instrument Type:
Heating|Chiller
Instrument Side:
Return|Flow
Set Separation:
12.4 mm

Issue 2.0 Nov 2022 Page 17
2.7 Clamp Guiderail to Pipe
Ensure that you have selected a suitable location and that the pipe is clean (see section 2
Installation).
Using the quick-release clamps provided, fasten the transducers to the pipe at an angle of 45° as
shown in Figure 8. Experience has shown that the most consistently accurate results are achieved
when the unit is mounted at this angle (see 2.1 Positioning). This minimises the effect of any flow
turbulence resulting from entrained air along the top of the pipe and sludge at the bottom.
2.8 Calibrate the PT100 Temperature Sensors (Heat Meter versions only)
IMPORTANT: THE PT100 SENSORS MUST BE BALANCED BEFORE INITIAL USE, USING THE
PROCEDURE DESCRIBED BELOW AND USED WITH THE CABLE LENGTH SUPPLIED.
EXTENDING OR SHORTENING THE CABLES WILL NEGATE THE CALIBRATION OF THE
SENSORS.
To ensure an accurate temperature differential:
1. Place the PT100 sensors touching each other and allow their temperature to stabilise for 1
minute.
2. Enter the password-controlled menu and scroll to the Calibration sub-menu (see Section 3.7
Calibration Menu).
3. Press the Enter key until the Zero Temp Offset screen is displayed.
4. Select Yes and press the Enter key to display the Attach Sensors screen.
5. Press the Enter key again and wait for instrument to return to the Zero Temp Offset screen.
2.9 Attach the PT100 Sensors (Heat Meter versions only)
The PT100 sensors must be located at the input and output of the system that is being monitored.
The area of pipe where they are to be attached must be free of grease and any insulating material.
It is recommended that any coating on the pipe is removed so that the sensor has the best possible
thermal contact with the pipe.
Clamp the sensors in position using the supplied stainless-steel cable ties.

Issue 2.0 Nov 2022 Page 18
Figure 8: Fully assembled U1000MkII-WM Heat Meter unit
2.10 Zero offset the Flow Sensors
For low flow rates slight offsets in the sensors/electronics can interfere with the accuracy of the
measurements. It is advisable to zero-offset the sensors once they are in place, if they are moved,
or if a new unit is attached.
Refer to menus section 3.7: Calibration and summary below.
The pipe should have Fluid present but with no Flow. If this is not possible (no access to valves or
Company will not allow) then leave this unset.
See Section 3.1 Accessing the Menus.
Enter the
User Menu (password) -> Calibration
Step to the Zero-Offset Screen then
Set a new Zero-Offset
Accept Setting and Carry On
2.11 Normal Operation
The screen sequence is different for the Flow Meter and Heat Meter models.