Micronics U1000MkII WM User manual

Issue 1.0
U1000MkII WM
U1000MKII-WM:Wall-Mounted Ultrasonic Flow Meter
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

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Issue 1.0 Nov 2020 Page i
CONTENTS
1INTRODUCTION ............................................................................................................................. 1
1.1 General Description ............................................................................................................ 1
1.2 How Does It Work?............................................................................................................. 2
1.3 Package Contents .............................................................................................................. 3
1.4 Display................................................................................................................................ 5
1.5 Quick Start Procedure ........................................................................................................ 6
1.6 Output and Communication Options ................................................................................... 6
2INSTALLATION ............................................................................................................................... 7
2.1 Identify Suitable Location.................................................................................................... 7
2.1.1 Additional Considerations for Locating Heat Meter versions ........................................ 7
2.1.2 Clean the Pipe’s Flow Sensor Contact Area ................................................................ 8
2.2 Connect Power and Signal Cables ..................................................................................... 8
2.2.1 Power Supply .............................................................................................................. 8
2.2.2 Guiderail/Flow Sensors................................................................................................ 8
2.2.3 PT100 Sensors (Heat Meter versions only) ................................................................. 9
2.2.4 Pulse Output Connection............................................................................................. 9
2.2.5 Current Output (if fitted) ............................................................................................... 9
2.2.6 Modbus/MBUS Connections (if fitted) ........................................................................ 10
2.3 Switch On ......................................................................................................................... 12
2.3.1 U1000MkII WM Flow Meter ....................................................................................... 12
2.3.2 U1000MkII WM Heat Meter ....................................................................................... 13
2.4 Assemble the Guiderail..................................................................................................... 14
2.5 Adjust Flow Sensor Separation......................................................................................... 14
2.6 Apply Gel Pads................................................................................................................. 14
2.7 Clamp Guiderail to Pipe.................................................................................................... 14
2.8 Calibrate the PT100 Sensors (Heat Meter versions only).................................................. 15
2.9 Attach the PT100 Sensors (Heat Meter versions only)...................................................... 15
2.10 Normal Operation ............................................................................................................. 16
2.10.1 U1000MkII-WM Flow Meter ....................................................................................... 16
2.10.2 U1000MkII-WM Heat Meter ....................................................................................... 16
2.10.3 Troubleshooting the Flow Reading ............................................................................ 17
3MENUS .......................................................................................................................................... 18
3.1 Accessing the Menus........................................................................................................ 18
3.2 Setup Menu ...................................................................................................................... 19
3.3 Current Output Menu (4-20mA versions only)................................................................... 20
3.4 Modbus Setup Menu (Modbus versions only) ................................................................... 21
3.5 M-Bus Setup Menu (M-Bus versions only)........................................................................ 21
3.6 Pulse Output Menu........................................................................................................... 22

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3.6.1 Volume Pulse ............................................................................................................ 22
3.6.2 Flow Alarm ................................................................................................................ 22
3.6.3 Energy Pulse (Heat Meter versions only)................................................................... 23
3.6.4 Frequency ................................................................................................................. 23
3.7 Calibration Menu .............................................................................................................. 24
3.8 Volume Totals Menu......................................................................................................... 24
3.9 Diagnostics Menu ............................................................................................................. 25
4OUTPUTS ...................................................................................................................................... 26
4.1 Pulse Output..................................................................................................................... 26
4.1.1 Volumetric Pulse........................................................................................................ 26
4.1.2 Frequency Mode........................................................................................................ 27
4.1.3 Energy Pulse (Heat Meter versions only)................................................................... 27
4.1.4 Flow Alarm - Low Flow .............................................................................................. 27
4.1.5 Flow Alarm –Signal Loss .......................................................................................... 27
4.24-20mA Current Output .................................................................................................... 27
4.3 Modbus (if fitted)............................................................................................................... 28
4.4 M-Bus (if fitted) ................................................................................................................. 31
4.4.1 Acknowledge Function............................................................................................... 31
4.4.2 Select Slave Function ................................................................................................ 32
4.4.3 Data Transfer Functions ............................................................................................ 32
4.4.4 REQ_UD2 –REQUEST DATA .................................................................................. 33
4.4.5 RSP_UD2 –RETURN DATA..................................................................................... 34
4.4.6 Switch Baud Rate Function........................................................................................ 35
4.4.7 Change Primary Address Function ............................................................................ 38
5APPENDIX..................................................................................................................................... 39
5.1 Specification ..................................................................................................................... 39
5.2 Default values................................................................................................................... 41
5.3 Limitations with Water-Glycol Mixtures ............................................................................. 41
5.4 Positioning........................................................................................................................ 41
5.5 Error and Warning Messages ........................................................................................... 43
5.5.1 Error Messages ......................................................................................................... 43
5.5.2 Example Error Messages........................................................................................... 43
5.5.3 Modbus Error Messages (if Modbus fitted) ................................................................ 44
5.5.4 Flow Errors ................................................................................................................ 44
5.5.5 Flow Warnings........................................................................................................... 44
5.5.6 Data Entry Errors....................................................................................................... 45
6DECLARATION OF CONFORMITY......................................................................................... 46

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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 steel, stainless steel, copper and plastic pipes with internal diameter in the range 20mm (0.8”) to
110mm (4.3”), or 105mm (4.1”) to 215mm (8.5”) depending on the product purchased. The wall-
mounted electronics and control unit requires an external 12 - 24V AC/DC power supply (7VA
minimum), optionally supplied.
Both models can be supplied as pulse output only units or with optional 4-20mA flow proportional
output, and/or Modbus or M-Bus 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 and display, power, signal and Modbus connections and cabling.
2. Ultrasonic Flow Sensors
Two transducers for flow measurement with VHB gel pads to ensure good contact with
pipework.
In addition, the kit contains:
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 25-70mm (p/n 225-5007)
or 51-127mm (2) (p/n 225-5001)
6. Heat Meter versions only: PT100 temperature sensors with 3m cable (2)
7. 12 V power supply and adapters (optionally supplied).
The kit also contains a copy of this manual.

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Figure 2 Package Contents
1
2
3
4
5
6
7

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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)
Energy
(Heat Meter versions)
Energy pulse signal
4-20mA
(Flow Meter versions)
4-20mA signal.
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 pages 7 and 41). 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 5m of the pipe location.
b. Connect to a 12 to 24V AC or DC power supply (7VA minimum per instrument) - See
page 8.
c. Switch on and program to determine the correct sensor separation (See page 12).
3. Attach the flow sensors and guide rail:
a. Set the flow sensors to the correct separation (see page 14).
b. Apply the gel pads to the sensors (see page 14).
c. Mount the sensor and guide rail assembly onto the pipe using the supplied hose clips
(see page 14).
4. Connect the sensors to the wall-mounted electronics unit (see page 8).
5. Heat Meter versions only: Connect the PT100 temperature sensors to the electronics unit (see
Section 2.2.3, page 9) and attach to the flow and return pipes (see Section 2.1.1, page 7).
6. Check that flow readings can be obtained (see page 16).
1.6 Output and Communication Options
To use a Pulse Output option, see page 26.
To use the 4-20mA Output, see page 27.
To use the Modbus interface, see page 28. The address, data rate, and configuration of the
instrument must be set using the Modbus Menu (see page 21). The default address is 1, the default
data rate is 38400 baud, and the default Comms configuration is 8-None-2.
To use MBus communication, see page 31. The primary and secondary addresses must be set
using the MBus Menu (see page 21).

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2INSTALLATION
2.1 Identify Suitable Location
We recommend a location where there is a straight length of pipe with no bends, constrictions or
obstructions within at least 10 times the pipe diameter upstream, and 5 times the pipe diameter
downstream.
Figure 4 Identifying a suitable location
IMPORTANT: DO NOT EXPECT TO OBTAIN ACCURATE RESULTS IF THE UNIT IS
POSITIONED CLOSE TO ANY OBSTRUCTION THAT DISTORTS THE UNIFORMITY OF THE
FLUID FLOW PROFILE (SEE PAGE 41). 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
UPSTREAM
10 x pipe
diameter
DOWNSTREAM
5 x pipe
diameter
fluid flow

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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 in order 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.
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/MBUS Flow Sensors
Figure 6 Terminal blocks and connectors
2.2.1 Power Supply
The U1000MKII WM will operate within the voltage range 12 - 24V AC/DC. Micronics can supply, as
an optional item, a 12VAC power supply. If you intend to use an alternative power supply it must
have a minimum rating of 7VA 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 5m cables.

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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, 5m cables, as shown in Figure 7. Do not fasten the probes to the pipework until
you have carried out the calibration (see page 15).
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 500mA and maximum load voltage of 48V AC.
The relay also provides 2500V 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 620Ω.
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 3.5mA.
This output is suitable for SELV circuits only

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2.2.6 Modbus/MBUS Connections (if fitted)
If fitted, the Modbus or MBUS output is available at the terminal blocks labelled IO1 1/01-04
terminals:
IO1 Terminal
Modbus
MBUS
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
For full immunity to electrical interference the screen of the power/pulse output cable and Modbus
cable should be connected to Earth.
Figure 8 Modbus wiring diagram with spurs

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Figure 9 Modbus wiring without spurs
Figure 10 M-Bus wiring with spurs
Figure 11 M-Bus wiring without spurs

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2.3 Switch On
The initial screen sequence is different for the Flow Meter and Heat Meter models.
2.3.1 U1000MkII WM Flow 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.
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.
Enter the temperature of the fluid. The value must be in
the range 0.1 –140.0°C.
Select to read Flow or Velocity using the key.
Press to confirm the selection.
Select the System Units using the key.
Press to confirm the System Units.
Select the Flow Units using the key.
Press to confirm the Flow Units.
Select the fluid using the key.
Press to confirm the fluid name.
Pipe Material:
PLASTIC
Enter Pipe ID:
050.0 mm
Wall Thickness:
004.35 mm
Temperature:
020.0 oC
Instrument Fluid
Glycol | Water
Flow Units:
l/min|l/s
Glycol | Water
System Units
litres|m3
Glycol | Water
Select Reading
Flow|Vel
Glycol | Water

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The unit now shows the correct flow sensor separation (in
this case, “12.4mm”) 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 page 18).
Continue with the installation of the Sensor Assembly (see page 14).
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.
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.
Enter the temperature of the fluid. The value must be in
the range 0.1 –140.0°C.
Select to read Flow or Velocity using the key.
Press to confirm the selection.
Select the System Units using the key.
Press to confirm the System Units.
Select the Flow Units using the key.
Press to confirm the Flow Units.
Set Separation:
12.4mm
Pipe Material:
PLASTIC
Enter Pipe ID:
050.0 mm
Wall Thickness:
004.35 mm
Flow Units:
l/min|l/s
System Units:
litres|m3
Select Reading:
Flow|Vel
Temperature:
020.0 oC

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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.
Select the fluid using .
Press to confirm the fluid name.
The unit now shows the correct flow sensor separation (in
this case, “12.4mm”) 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 page 18).
Continue with the installation of the Sensor Assembly.
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 page 12), 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.
2.7 Clamp Guiderail to Pipe
Ensure that you have selected a suitable location (see pages 7 and 41) and that the pipe is clean
(see page 8).
Using the quick-release clamps provided, fasten the transducers to the pipe at an angle of 45° as
shown in Figure 12. Experience has shown that the most consistently accurate results are achieved
Instrument Type:
Heating|Chiller
Instrument Side:
Return|Flow
Instrument Fluid
Glycol|Water
Set Separation:
12.4mm

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when the unit is mounted at this angle (see page 41). 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 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 page 18).
3. Press the Enter key until the Zero Temp Offset screen is displayed (see page 24).
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.
Figure 12 Fully assembled U1000MkII-WM Heat Meter unit

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2.10 Normal Operation
The screen sequence is different for the Flow Meter and Heat Meter models.
2.10.1 U1000MkII-WM Flow Meter
Press .
The unit checks for a valid flow signal.
If a valid signal is found, signal strength and flow rate
are displayed. The signal strength should be at least
40% for reliable operation.
2.10.2 U1000MkII-WM Heat Meter
Press .
The unit checks for a valid flow signal.
If a valid signal is found, signal strength and flow rate
are displayed. The signal strength should be at least
40% for reliable operation.
Press the and keys to scroll to the Total Flow, Temperature dT, Total Energy and
Instant Power screens.
Checking Signals
Searching...
Sig:80% *
120.00 l/min
Checking Signals
Searching...
Sig:98% *
0247.8 l/min
Instant Power:
617.00 kWh
Temperature dT
H53.9 C17.4:36.5
Total Energy:
50.09 kWh
Total Flow:
598.7 l