Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 1
Micronics U1000MKII-HM
Clamp On Ultrasonic Heat Meter
User Manual
Micronics Ltd, Knaves Beech Business Centre, Davies Way, Loudwater,
High Wycombe, Bucks HP10 9QR
Telephone: +44(0)1628 810456 E-mail: sales@micronicsltd.co.uk
www.micronicsflowmeters.com
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 2
Table of Contents
1 General Description ..................................................................................................................................... 3
2 Quick Start Procedure ................................................................................................................................. 4
3 How Does It Work? ...................................................................................................................................... 5
4 User Interface .............................................................................................................................................. 6
4.1 Key Switches ....................................................................................................................................... 6
5 Installing The U1000MKII-HM ..................................................................................................................... 7
5.1 Preparation .......................................................................................................................................... 8
5.2 Sensor Separation ............................................................................................................................... 8
5.3 Attaching The U1000MKII-HM To The Pipe ...................................................................................... 10
5.4 Adaptors For Small Pipes .................................................................................................................. 11
5.5 Attaching The Temperature Sensors ................................................................................................. 12
5.6 U1000MKII-HM Interface Cables ....................................................................................................... 13
5.7 Connecting The U1000MKII-HM To The Supply ............................................................................... 13
5.8 Pulse Output Connection ................................................................................................................... 14
5.9 Modbus Connections ......................................................................................................................... 14
5.10 Cable Screen ..................................................................................................................................... 14
6 Powering Up For The First Time ............................................................................................................... 15
6.1 How To Enter The Pipe ID ................................................................................................................. 17
6.2 Pulse Output ...................................................................................................................................... 18
6.2.1 Volumetric Mode ........................................................................................................................ 18
6.2.2 Frequency Mode ........................................................................................................................ 18
6.2.3 Energy Mode ............................................................................................................................. 18
6.2.4 Flow Alarm – High/Low Flow or Signal Loss ............................................................................. 18
6.3 Modbus .............................................................................................................................................. 19
7 Subsequent Power-ON Sequence ............................................................................................................ 21
8 Information Screens ................................................................................................................................... 21
9 Password Controlled Menus ...................................................................................................................... 22
9.1 General Procedure For Changing Menu Settings ............................................................................. 22
9.1.1 Selection Menus ........................................................................................................................ 22
9.1.2 Data Entry Menus ...................................................................................................................... 22
9.2 User Password Controlled Menu Structure ....................................................................................... 22
10 Diagnostics Menu .................................................................................................................................. 28
11 Relocation Of Guide Rail ....................................................................................................................... 30
12 Appendix I – U1000MKII-HM Specification ........................................................................................... 31
13 Appendix II – Default Values ................................................................................................................. 33
14 Appendix III – Error and Warning Messages ......................................................................................... 34
13 Declaration of conformity ………………………….……………………………………………...……………..36
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 3
1 General Description
• Fixed installation, clamp-on heat meter
• Easy to install
• Requires the minimum of information to be entered by the user
• Electronics and guide rail housings form an integral unit
• Attached to the pipe using the supplied jubilee clips
• Power to the unit is provided by an external 12 - 24V ac/dc power supply (7VA minimum)
• Operates on steel, stainless steel, copper and plastic pipes with IDs in the range 20mm
(0.8”) to 165mm (6.5”) depending on product purchased
• Simple to install temperature sensors
• Compact, rugged and reliable, the U1000MKII-HM has been designed to provide sustained
performance in industrial environments
.
U1000MKII HM standard features include:
▪ 2 line x 16 character LCD with backlight
▪ 4-key keypad
▪ Isolated pulse output
▪ Universal guide rail for setting pre-assembled transducers
▪ Two sets of self-adhesive Gel pad acoustic couplant
▪ Dual PT100 type temperature sensors (standard cable length 3m)
▪ Continuous signal monitoring
▪ Password protected menu operation for secure use
▪ Operates from external 12 to 24Vac or dc power supplies
▪ Small pipe adaptors
Options
• Select Pipe range
➢ 20mm inside diameter to 114mm inside diameter pipe
➢ 115mm inside diameter to 165mm inside diameter pipe
• Available as Modbus heatmeter
• Available as Pulse only heat meter
Typical applications
▪ Hot water metering and flow measurement
▪ Flow measurement for Energy Metering
▪ Chilled water metering and flow measurement
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 4
2 Quick Start Procedure
The following procedure details the steps required to set up the heat meter. See the sections
referred to if you are unsure about how to install the instrument.
1. Wire the electronics up to a 12 to 24V ac or dc power supply (7VA minimum per instrument)
via the Blue and Brown wires. (See Section 5.7).
2. Establish a suitable location for the flow meter on a straight length of pipe clear of bends and
valves or similar obstructions. (See Sections 5 and 5.1).
3. Determine the pipe internal diameter and material.
4. Either use the table in the manual, or power up the instrument to determine the correct
separation code. (See Sections 5.2 or 6).
5. Set the sensors to the correct separation by adjusting the sensor holding screws so the
sensor can slide in the slot. (See Section 5.2).
6. Select any adaptors needed for pipes with an outside diameter of less than 60mm, inside
diameter will typically be less than 50mm. (See Section 5.4).
7. Apply the Gel pads to the sensors and mount the guide rail on the pipe using the banding
provided, then remove the sensor holding screws. (See Section 5.3).
8. Plug in the flow and temperature sensors and check that flow and temperature readings can
be obtained. (See sections 6 and 7.1). The electronics can be left resting on the guide rail
and fully clipped down later once all measurements have been checked.
9. Place the temperature sensors touching each other. Wait for the temperature readings to
stabilize, indicated by no change for 1 minute. Then zero the temperature sensors. (See
Section 5.5).
10. Attach the temperature sensors on to the pipe using the self-adhesive pads. Then use the
supplied banding to secure the sensor to the pipe. Don’t overtighten the banding. The
sensor must be in good thermal contact with the pipe and the leads must not be under any
strain. (See Section 5.5).
11. Once good readings have been obtained any further changes, such as selecting different
units, can be made via the User Menu. (See Section 7).
12. Clip the electronics assembly on to the guide rail and tighten screw to complete the
assembly.
13. If the Modbus interface is being used then the address, and data rate, and configuration of
the instrument must be set using the User Menu. (See Section 7). The default address is 1,
the default data rate is 38400 baud, and the default comms configuration is 8-None-2.
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 5
3 How Does It Work?
The U1000MKII-HM is a clamp-on, ultrasonic flowmeter that 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 (red) as shown in the upper half of Figure 1. The transmission is then made in the
reverse direction, being sent from the Upstream transducer (red) to the Downstream transducer
(blue) as shown in the lower half of Figure1. 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.
The two temperature sensors measure the difference in temperature between inlet and outlet 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
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 6
4 User Interface
Figure 2 illustrates the U1000MKII-HM user interface comprising:-
• One 2 line x 16 character LCD with backlight
• Four tactile key switches
• Two LEDs
4.1 Key Switches
kWh LED is illuminated when the Energy pulse is enabled.
Pulse LED is illuminated when the Pulse, Frequency or Alarm functions are
eneabled.
Selection key. Allows the user to select between options on the
display.
Used to decrement the value of each digit in numeric entry fields.
V
Figure 2 U1000MKII-HM User Interface
Used to increment the value of each digit in numeric entry fields.
Used to enter the selection displayed or terminate the data
entry. Pressing this key can also take the user to a sub menu or
to the Flow Reading screen.
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 7
5 Installing The U1000MKII-HM
Figure 3 Location of Transducers
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, making sure sensors are positioned as in figure 3 above.
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
transducer guide rails are mounted at 45°with respect to the top of the pipe.
The U1000MKII-HM equipment expects a uniform flow profile, as a distorted flow will produce
unpredictable measurement errors. Flow profile distortions can result from upstream disturbance
such as bends, tees, valves, pumps and other similar obstructions. To ensure a uniform profile the
transducers must be mounted far enough away from any cause of distortion such that it no longer
has an effect.
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. It is important that liquid flows
uniformly within the length of pipe being monitored, and that the flow profile is not distorted by any
upstream or downstream obstructions. This is best achieved by ensuring there is a straight length of
pipe upstream of the transducers of at least 20 times the pipe diameter, and 10 times the pipe
diameter on the downstream side, as shown in Figure 3. Flow Measurements can be made on
shorter lengths of straight pipe, down to 10 diameters upstream and 5 diameters downstream, but
when the transducers are mounted this close to any obstruction the resulting errors can be
unpredictable.
Key Point: Do not expect to obtain accurate results if the transducers 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 the installation instructions applicable to the product.
Possible Air
Possible
sludge
Guide
rail
Uniform Flow Profile
Distorted Flow Profile
Flow
Flow
Valid transducer location
20 x Diameter
10 x Diameter
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 8
5.1 Preparation
1. Before attaching the transducers, first ensure that the proposed location satisfies the distance
requirements shown in Figure 3 otherwise the resulting accuracy of the flow readings may be
affected. The unit is preconfigured for the application as follows :-
Instrument Type Heating or Chiller
Installation Flow or Return
Fluid Water or Water + 30% Ethylene Glycol
Flow and Return refer to the location of the Flow measurement relative to flow circuit.
Details of this configuration can be found in the Diagnostics menu. (See Section 9).
2. 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
transducers is an important factor in achieving a good ultrasound signal strength and therefore
maximum accuracy.
5.2 Sensor Separation
The sensors must be separated by the correct distance for the pipe size and type they will be used
on. The table below gives a guide to the typical separation code for a given pipe material and inside
diameter. If the wall thickness is significantly different from this value then the separation may need
to be one code higher or lower. The instrument displays the required separation after the pipe
internal diameter and material are entered.
Pipe ID
Pipe ID
Water
Glycol
PipeID
Pipe ID
Water
Glycol
mm
inches
S/Steel
S/Steel
mm
inches
M/Steel
M/Steel
20-22
0.79-0.87
A-3
A-3
21-22
0.83-0.87
C-3
C-3
26-29
1.02-1.14
B-2
B-2
27
1.06
D-2
E-3
34-36
1.34-1.42
C-2
C-4
35-36
1.38-1.42
C-4
C-4
37-40
1.46-1.57
B-3
D-4
41-44
1.61-1.73
C-3
F-3
52-58
2.05-2.29
B-2
D-3
52-54
2.05-2.13
C-4
C-4
59-64
2.32-2.52
A-3
F-3
62-65
2.44-2.56
F-3
F-3
72-79
2.83-3.11
B-3
E-5
76-79
2.99-3.11
E-5
G-4
86-92
3.39-3.62
C-3
B-4
88-94
3.46-3.70
B-4
B-4
99-105
3.90-4.13
D-3
C-4
95-101
3.74-3.98
D-3
C-4
125-131
4.92-5.16
F-3
E-4
122-128
4.80-5.04
F-3
E-4
152-158
5.98-6.22
E-5
G-4
150-156
5.90-6.14
E-5
G-4
Pipe ID
Pipe ID
Water
Glycol
Pipe ID
Pipe ID
Water
Glycol
mm
inches
PVC U
PVC U
mm
inches
Copper
Copper
22-23
0.87-0.90
C-3
C-3
20-39
0.79-1.54
B-1
B-1
27-28
1.06-1.10
D-2
C-3
20-39
0.79-1.54
B-1
B-1
36-37
1.42-1.45
C-4
C-4
20-39
0.79-1.54
B-1
B-1
43-45
1.69-1.77
C-3
B-4
20-39
0.79-1.54
B-1
A-2
56-59
2.20-2.32
E-3
E-3
47-53
1.85-2.09
C-1
C-1
67-69
2.64-2.71
E-4
D-5
61-67
2.40-2.64
A-3
A-3
78-81
3.07-3.19
D-2
C-3
68-74
2.68-2.91
C-2
B-3
95-101
3.74-3.97
D-3
C-4
96-102
3.78-4.02
B-4
B-4
109-115
4.29-4.53
E-3
D-4
117-123
4.61-4.84
E-3
D-4
122-128
4.80-5.04
F-3
E-4
146-152
5.75-5.98
D-5
D-5
143-149
5.63-5.87
F-4
E-5
157-162
6.18-6.34
G-4
F-5
Figure 4 Separation Table
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 9
The diagram below shows how to adjust the separation of the sensors
Figure 5 Separation Setting
NOTE. When the sensors have been moved to the correct setting and the guide rail is
attached to the pipe REMOVE the sensor holding screws, which will allow the spring
loaded transducers to make contact with the pipe.
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 10
5.3 Attaching the U1000MKII-HM to the pipe
After applying the Gel pads centrally on the sensors, follow the four steps shown in Figure 6 below
to attach the U1000MKII-HM to the pipe.
Figure 6 simple steps to attaching the U1000MKII-HM on the pipe
Note…The locking screws and washers should be kept in case it is necessary to change the
location of the guide rail and sensors. See the relocation section (section 10) for the procedure to do
this.
Remove the covers from the Gel pads
Ensure there are no air bubbles between
pad and sensor base
Check separation distance table on page 8 or
program unit before clamping guide rail to
pipe, using the supplied banding. Then
release and REMOVE sensor locking screws.
Connect sensors to the electronics
assembly before applying power.
Sensor leads can be connected either
way round.
Confirm the unit is working correctly before
attaching the electronic assembly onto
guide rail assembly.
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 11
5.4 Adaptors For Small Pipes
Guide rails for small pipes are supplied with adaptors. The diagram below show how these are fitted
around the pipe. The top part of the pipe adaptor clips into the ends of the guide rail.
Figure 7 Pipe Adaptors
Less than 40mm outside diameter
40 to 60mm outside diameter
Greater than 60mm outside diameter
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 12
5.5 Attaching The Temperature Sensors
The temperature 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.
The sockets on the enclosure are marked Hot and Cold. This defines the location of the
temperature sensors on installations where heat is being extracted from the system.
To ensure an accurate temperature differential the following procedure should be used.
1. Plug in the sensors and place them touching each other for 1 minute.
2. Enter the password controlled menu (See Section 8) and scroll to the calibration sub-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.
The instrument can now be turned off and the installation of the temperature sensors completed.
The sensors have a cut out profile to locate them; they are then anchored using the supplied cable
ties. The cable ties should not be over tightened or the sensors may be damaged. If the sensors
are located under pipe lagging then ensure this does not put a strain on the sensor cables. Tie
down the sensor cables after the sensors have been installed.
The temperature sensors must be balanced before initial use, using the
procedure described above and used with the cable length supplied.
Extending or shortening the cables will negate the calibration of the sensors.
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 13
5.6 U1000MKII-HM Interface Cables
The U1000MKII-HM interface cable supplied is a 6-core cable for power and pulse output
connections and a separate 4 core plug-in cable for the Modbus connections.
The un-insulated wire is the connection to the screen of the cable and should be earthed for full
immunity to electrical noise.
Figure 8 U1000MKII-HM instrument connections
5.7 Connecting The U1000MKII-HM To The Supply
The U1000MKII-HM will operate within the voltage range 12 - 24V ac/dc. The supply must have a
minimum rating of 7VA per instrument. Connect the external power supply to the Brown and Blue
wires of the six core cable.
For safety, connecting the U1000MKII to a power supply via a mains rated transformer is the
responsibility of the installer to conform to the regional voltage safety directives.
Power
Figure 8. U1000MKII-HM Interface Cable
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 14
5.8 Pulse Output Connection
The isolated pulse output 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 sensor’s electronics and the outside world.
The pulse output is available at the White and Green wires. Electrically this is a volt, or potential free
contact, and when selected as a low flow alarm is configurable NO/NC.
5.9 Modbus Connections
A lead is provided for the Modbus connections that plugs into the electronics assembly near the
power cable entry. The Brown is the -ve bus wire and the Black is the +ve bus wire. Both White
wires go to ground.
Modbus Connector Cable Part - Binder 99-9210-00-04 (Front View)
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”.
5.10 Cable Screen
For full immunity to electrical interference the screen of the power/pulse output cable and modbus
cable should be connected to Earth.
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 15
6 Powering Up For The First Time
Powering up for the first time will initiate the sequence shown in Figure 10:
Select the option required by pressing the keys
Figure 10 initial power up screens
Λ
V
V
Λ
Λ V Λ
V
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 16
1. The Micronics start up screen is displayed for 5 seconds.
2. The user enters the pipe ID and selects the material (refer to section 6.1).
3. On pressing Enter in response to the Set Separation screen, the U1000MKII-HM then checks for
a valid signal.
4. If a valid signal is found, signal strength and flow rate are displayed. The signal strength should
be at least 40% for reliable operation. The direction of flow when powered up will be taken to be the
positive flow direction. The pulse output will relate to the flow in this direction. If the flow is reversed
then the flow rate will still be displayed but the activity indication will change from an asterisk to an
exclamation mark and no pulses will be generated.
If the flow value is displayed as “------“ this indicates that there is no usable signal from sensors.
The cause of this could be:
• Incorrect pipe data
• No Gel pad/grease on the sensor
• Sensor not in contact with the pipe
• Very poor pipe condition-surface/inside
• Air in the liquid/pipe
Please note:
There is little available data on the specific heat capacity (K factor) for water glycol
mixes and there is no practical method of determining the percentage of glycol in a
system or the type of glycol in use. The calculations are based on a Water/Ethylene
glycol mix of 30%.
In practical terms the results should not be considered more than an approximation
as:
The fluid speed of sound can vary between 1480ms and 1578ms
No temperature compensation curve is available for water/glycol mixes,
The percentage of Glycol can vary the specific heat capacity from 1.00 to 1.6 J/M3 * K
The type of glycol added can change the specific heat capacity and fluid speed of
sound considerably.
The Factory enabled user set-up of the application relies on the installer to set the
correct operating parameters, a considerable variation in results can be obtained
from incorrectly set-up units.
Micronics U1000MKII-HM User Manual
Issue X.X July 18
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6.1 How To Enter The Pipe ID
Figure 11 shows the Enter Pipe ID screen after an initial power up.
Initially, the hundreds unit (050.0) will blink.
Press the
key to increment the hundreds digit (050.0) in the sequence 0, 1.
Press once to increment digit, to toggle between 0 and 1.
Press the
key to decrement the hundreds digit in the sequence 1, 0. Press
once to decrement digit, to toggle between 1 and 0.
Press the
key to move to the tens digit (050.0). The tens digit should now
blink.
Increment the tens digit in the sequence 0,1,2,3,4,5,6,7,8,9,0 using
the key. Press once to increment digit or hold down to scroll
through the numeric sequence. Decrement the tens digit in the
sequence 9,8,7,6,5,4,3,2,1,0,9 using the key. Press once to
increment digit to scroll through the numeric sequence.
Press the
key to move to the units digit (050.0). The units digit should now
blink. Increment or decrement the units digit in an identical manner
to the tens digit described above.
Press the
key to move to the decimal digit (050.0). The decimal digit should
now blink. Increment or decrement the decimal digit in an identical
manner to the tens digit described above.
Press the
Use
key to enter the Pipe ID numerical value, and move to the next
screen
and
keys to scroll through the pipe materials and then
press
To select the material and complete the setup
procedure.
If any of the parameters need to be changed from the default values, for example different units are
required, then the menu system must be activated via the password (see section 8).
V
>
V
Pipe material
Steel
V
Figure 11 Enter Pipe ID Screen (Metric)
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 18
6.2 Pulse Output
Pulse output can be set up to operate in four modes: Volume, Frequency, Energy or Flow Alarm.
6.2.1 Volumetric Mode
In Volumetric mode, each pulse output represents a measured volume of 10 litres (default value). In
Volumetric mode, with the Vol per Pulse set to 1 and the pulse width set to 50ms, the maximum
number of pulses that can be output (without storage) is 1/(0.05*2) = 10 pulses per second. If the
flow rate in the pipe is such that it is greater than 10 pulses per second, increase the Vol per Pulse
to 10 litres, or reduce the Pulse Width value, to avoid creating a buffer of pulses when the flow
stops.
6.2.2 Frequency Mode
In Frequency mode, the pulse output frequency is proportional to the flow rate within a specified
frequency range of 1 – 200Hz. The flow units on the frequency output are fixed as litres per
second.
The conversion factors from imperial units are:-
US gallons/minute multiply by 0.06309
US gallons/hour multiply by 0.00105
Imperial gallons/minute multiply by 0.07577
Imperial gallons/hour multiply by 0.001263
6.2.3 Energy Mode
When the Pulse Output is set to Energy, the kWh LED will be permanently on. Choose from
1,10,100kWh or 1MWh when in metric mode and 1,10,100kBTU or 1MBTU in imperial mode. Each
pulse represents an amount of energy e.g. 1kWh. The same limitation on maximum pulse rate
applies as detailed in the Volumetric Mode. Again a larger unit of energy per pulse or a smaller
pulse width may be required.
6.2.4 Flow Alarm – Low Flow or Signal Loss
It is possible to use the pulse output as a Low Flow Alarm or a Signal Loss Alarm.
For the High/Low Alarm the user can set a range between 0 and 9999 (no decimal places), in the
same units being used to measure flow. The default setting is normally open, but the user can
select between N/O and N/C. There is a 2.5% hysteresis on the switching of the output. Once
turned on the flow rate must rise by 2.5% more than the set value to turn it on/off again.
If the flow reading (Signal) is lost, as indicated by the flow rate being displayed as “-----“, the alarm
will be triggered. The Pulse LED will indicate the state of the alarm. The default setting is normally
open, but the user can select between N/O and N/C.
The Pulse LED will be on if the alarm is set.
Micronics U1000MKII-HM User Manual
Issue X.X July 18
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6.3 Modbus (if fitted)
The Modbus RTU interface is configured via the Modbus sub menu in the password controlled
menu.
The data rate can be selected in the range 1200 to 38400 baud.
The address can be set in the range 1 to 126.
Polling Rate 1000ms (1sec). Time out after 5 seconds.
The instrument responds to the “read holding registers” request (CMD 03).
If the flow reading is invalid then the flow value will be zero.
If a temperature sensor goes out of range then the value will go to -11.
Both of these faults will set the relevant status bit.The following registers are available.
Modbus
Register
Register
Offset
Type
Typical
Contents Meaning
Notes
n/a
n/a
Byte 0x01
Instrument Address
n/a
n/a
Byte 0x03
Instrument Command
n/a
n/a
Byte 0x40
Number of bytes to read
40001
0
Int-16
0x00
Device ID
0xAC Energy Meter
0xac
40002
1
Int-16
0x00
Status
0x0000 OK
Not[0x0000] Fault
0x00
40003
2
Int-16
0x00
System Type
0x04 Heating system
0x0C Chiller system
0x04
40004
3
Int-16
0x00
Serial Identifier
0x01
40005
4
Int-16
0x23
0x45
40006
5
Int-16
0x60
0x00
40007
6
iee754
0x40
Measured Velocity
Units in m/s
0x1f
40008
7
0x67
0xd3
40009
8
iee754
0x41
Measured Flow
Units in m3/hr for
Metric
Units in US Gal/m
for Imperial
0x8c
40010
9
0xd8
0xb0
40011
10
iee754
0x42
Calculated Power
Units in kW for
Metric
Units in BTU/s for
Imperial
0x1c
40012
11
0x2e
0x34
40013
12
iee754
0x44
Calculated Energy
Units in kWh for
Metric
Units in kBTU for
Imperial
0x93
40014
13
0xc6
0xe8
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 20
On a unit set to Imperial the temperature is in °F, Power is in BTUs and flow in US Gallons.
Figure 12 Modbus registers
40015
14
iee754
0x41
Measured Temperature (Hot)
Units in Degrees Celsius for
Metric Units in Degrees
Fahrenheit for Imperial
0x98
40016
15
0x00
0x00
40017
16
iee754
0x41
Measured Temperature (Cold)
Units in Degrees Celsius for
Metric Units in Degrees
Fahrenheit for Imperial
0x88
40018
17
0x00
0x00
40019
18
iee754
0x40
Measured Temperature
(Difference)
Units in Degrees Celsius for
Metric Units in Degrees
Fahrenheit for Imperial
0x00
40020
19
0x00
0x00
40021
20
iee754
0x60
Measured Total
Units in m3 for Metric
Units in US Gal for Imperial
0xef
40022
21
0x3c
0x1c
40023
22
Int-16
0x00
Instrument Units
0x00 Metric
0x01 Imperial
0x00
40024
23
Int-16
0x00
Instrument Gain
Gain in dB
0x01
40025
24
Int-16
0x00
Instrument SNR
SNR in dB
0x0a
40026
25
Int-16
0x00
Instrument Signal
Signal in %
0x62
40027
26
iee754
0x42
Measured Delta-Time
Difference
Diagnostic Data
Units in nanoseconds
0xc9
40028
27
0xff
0x7d
40029
28
iee754
0x42
Instrument ETA
Diagnostic Data
Units in nanoseconds
0xa8
40030
29
0x8b
0xf5
40031
30
iee754
0x42
Instrument ATA
Diagnostic Data
Units in nanoseconds
0xc8
40032
31
0x00
0x00
n/a
n/a
Int-16
0xed
CRC-16
0x98
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 21
7 Subsequent Power-ON Sequence
If the power supply is cycled OFF then ON after the pipe data has been entered, all subsequent
start-ups will use the same configuration as was previously entered. If the configuration needs to be
changed for any reason, the user can make use of the password-controlled menu as described in
section 7.
8 Information Screens
Temperature dT
H30.0 C23.0 : 7.0
v
v
v
v
Λ
Λ Λ Λ
Λ
v
Diagnostics
>
Total Flow
1012.23 litres
Figure 13 information screens
Instant Power:
000.00 kW
Sig 80% *
100 l/min
Total Energy:
00.00 kWh
The system will initially display the Flow Reading screen. If there are valid flow and
temperature readings, then after a few seconds the Total Energy screen will be
displayed.
If the flow reading is invalid then the Flow screen will be displayed. Similarly the
Temperature screen will be displayed if a reading goes out of range.
>
>
>
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 22
9 Password Controlled Menus
The password controlled menu allows the user some flexibility to change the default settings:
User Password (71360):
• Setup Menu
• Comms Menu
• Pulse Output Menu
• Calibration Menu
• Totaliser Menu
9.1 General Procedure For Changing Menu Settings
9.1.1 Selection Menus
When a password controlled menu is selected the procedure for changing the default setting is the
same for most menus. For example, consider the Flow Units menu shown in Figure 14.
The default value ‘l/min’ will blink to indicate that this is the current setting. To change to ‘l/s’, press
the key. Now the ‘l/s’ units will blink to indicate that this is now the selected units. Press the
key to confirm the change.
There are other default settings where the and keys are used to scroll through the
options.
9.1.2 Data Entry Menus
Menus containing a numeric value can be altered using the same method used to input the pipe ID.
9.2 User Password Controlled Menu Structure
While in Flow reading or Total flow mode, pressing the key will access the user password
menu. Enter 71360 using the procedure explained in section 6.1 to enter the password.
The flow chart shown in Fig.15 shows the user password menu structure. To skip over any menu
item that should remain unchanged, simply press the key.
Figure 14 Flow Units menu
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 23
Total Energy:
606.64 kWh
Enter Password:
*****
PASSWORD CONTROLLED MENUS
NOTE: FROM FLOW SCREEN PRESS ENTER, ENTER PASSWORD THEN SCROLL
Invalid & OR No
input for 10 seconds
User Menu:
Pulse Output
User Menu:
Calibration
User Menu:
Setup
User Menu:
Totals
Checking Signals
******
Sig: 87% *
246.3 l/min
Setup Menu
Totals Menu
Pulse Output Menu
User Menu:
Exit
v
v
v
v
Calibration Menu
v
User Menu:
Modbus Setup
v
Comms Menu
Figure 15 Main Menu
Λ
Λ
Λ
Λ
Λ
Λ
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 24
Figure 16 Setup Menu
If “inches” is selected then the temperatures will be displayed in °F and the energy values will be in
BTUs.
Select Dimensions:
Enter Pipe ID:
Enter Pipe ID:
1.969 inches
Select Reading:
Select Reading:
Flow | Vel
System Units:
System Units:
Impgal | USgal
Flow Units
Flow Units:
Flow Units:
Usgal/m |USgal/h
Flow Units
gal/min | gal/h
Range 20 – 110mm
SETUP MENU
Inches &
Invalid
&
mm &
Invalid &
Valid &
Valid &
Vel & (m/s)
m3 &
Select &
Select &
Valid &
Flow &
USgal &
Impgal &
Vel &
(ft/s)
Range 0.79 – 4.33
Select Material:
Steel/Plastic
/Copper/S_steel
Set Separation:
B 3
Instrument Fluid
Glycol|Water
Instrument Type
Heating|Chiller
Instrument Side
Return|Flow
and User installation
setup
Select Dimensions:
mm | inches
Enter Pipe ID:
050.0 mm
Select Reading:
Flow | Vel
System Units:
litres | m3
Flow Units
m3/min | m3/h
Flow Units:
l/min | l/s
Range 20 – 165mm
050.0 mm
Range 0.79 – 6.50
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 25
Figure 17 Modbus menu
Modbus Address:
103
Modbus Baud:
38400/19200/9600/4800/
2400/1200
MODBUS SETUP MENU
Range 1.0 to 126.0
103
Invalid &
Valid &
Modbus Comms:
8-None-2/8-None-1/
8-Odd-1/8-Even-1
Select &
Select &
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 26
Figure 18 Pulse output
Select Pulse:
OFF | ON
Volume per Pulse
010.000
Pulse Width
50 ms
PULSE OUTPUT MENU
Valid &
On &
Volume &
Valid &
Max Pulse Freq
200 Hz
Valid &
Test mode press V or Λ to
generate a 20ms pulse
Invalid &
Select > &
Pulse Type:
Volume/Energy/Frequency
/FlowAlarm
Range 3 - 99
50 ms
Range 1 – 200
200
Invalid &
Valid &
Off &
Energy Pulse
1/10/100 kWh or 1 Mwh
1/10/100 kBTU or 1 MBTU
Energy &
Flow Alarm:
Flow Alarm press > to select
Alarm Status:
N/Closed | N/Open
Freq &
Select level
&
Enter Level:
0500 Units
Max Flow @ Freq:
09999.99 l/s
Flow Alarm:
Level | Sig Loss
Alarm Status:
N/Closed | N/Open
Alarm Type:
Alarm Type:
Level | Sig Loss
Select > &
Select > sig loss
&
User Menu:
Pulse Output
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 27
Figure 19 Calibration and totaliser Menu
Damping Time [s]:
20
Zero Offset
0.000 l/min
Range 0.00 – 0.50
0.02 m/s
Done
Zero Offset:
Averaging…9
^ To Clear
V To Set
Valid &
Invalid &
Calibrat. Factor:
1.000
Range 0.500–1.500
1.000
CALIBRATION MENU
Invalid &
Valid &
Zero Temp Offset
NO|YES
No &
Calibrate #1
H00.0/C00.0: 0.00
Yes &
Attach Sensors:
Press Enter
Done
Zero Cut-off:
0.02 m/s
User Menu:
Totals
&
Reset Total:
NO |YES
TOTALS MENU
Press
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 28
10 Diagnostics Menu
The diagnostics menu provides some additional information about the heat meter and its setup. The
menu can be accessed by pressing the key from flow reading screen. The menu shown below
describes the various diagnostics items.
DIAGNOSTICS MENU
Sig: 87% *
246.3 l/min
The Estimated TA (Time of Arrival) and Actual TA show the
theoretical and measured transit times. If the actual value is
displayed as 9999.99 then a usable signal could not be
detected.
The unit’s software version is shown on the upper
line. The lower line shows the unit’s serial number.
Press
To exit the Diagnostics
Est.TA 85.64
Act .TA 86.77
20.00.16.02.01
S/N: XXXXX
Press v
This screen will display if the Pulse output is Activated or
Deactivated
Pulse:
Deactivated
ToFM connected
5060-01-01-01-03
RTD connected
01-01-01-00
Diagnostics
Error: None
The upper line shows if the flow board is
connected and the lower line shows the software
version of the flow board.
The RTD board software version is shown on the
upper line. The lower line shows it’s status.
This screen will display the Errors. A number between
0-255 will be displayed. If no errors reported “None” is
displayed.
Press v
Press >
Press v
Press v
Press v
Press v
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 29
Gain – a decibel number between -5dB and 80dB – lower is
better, should be around 40dB or below. Above 60dB need to
question the installation.
Signal/Noise ratio in dB, scale is 0 to 80dB – higher is better.
Below 20 question the installation.
The lower line shows the current time differential between the
upstream and downstream signals.
Figure 20 Diagnostics Menu
Press
To exit the Diagnostics
Gain 81dB SNR 11dB
DT 135.818 ns
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 30
11 Relocation Of Guide Rail
If it is necessary to relocate the guide rail and sensor assembly use the following procedure.
1. Remove complete assembly from the pipe.
2. Undo the screw at the end of the guide rail and gently lift the same end as shown.
3. The opposite end of the electronics can now be released from the guide rail.
Figure 21
4. Disconnect the sensors.
5. Remove the original Gel pads from the sensors.
6. Push the sensor blocks into the guide rail to enable the washers and locking screws to be
refitted.
7. Replace the Gel pads. A spare set is supplied with the unit and further sets are available
from Micronics Ltd.
8. Follow the original procedure for installing the guide rail on the pipe.
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 31
12 Appendix I – U1000MKII-HM Specification
Table 1 lists the U1000MKII-HM Product Specification.
General
Measuring Technique
Transit time
Measurement channels
1
Timing Resolution
±50ps
Turn down ratio
200:1
Flow velocity range
0.1 to 10m/s bidirectional
Applicable Fluid types
Clean water with < 3% by volume of particulate content, or up to
30% ethylene glycol
Accuracy
±3% of flow reading for flow velocity >0.3m/s
Repeatability
±0.15% of measured value
Selectable units for Metric (mm)
Velocity: m/s,
Flow Rate: l/s, l/min, m3/min, m3/hr
Volume: litres, m3,
Energy : kWh, MWh
Selectable units for Imperial (inches)
Velocity: ft/s
Flow rate: Imp.gal/min, Imp.gal/hr, USgal/min, USgal/hr
Volume: Imp.gals, USgals
Energy : kBTU, MBTU
Totaliser
14 digits with roll over to zero
Languages supported
English only
Power input
12 – 24V ac or dc (Isolated)
Power consumption
7VA maximum
Cable
5m screened 6 core
Pulse Output
Output
Opto-isolated MOSFET volt free NO/NC contact selectable.
Isolation
2500V
Pulse width
Default value 50ms; programmable range 3 – 99ms
Pulse repetition rate
Up to 166 pulses/sec (depending on pulse width)
Frequency mode
200 Hz maximum (1-200)
Maximum load voltage/current
48V AC / 500mA
Modbus
Format
RTU
Baud rate
1200, 2400, 4800, 9600, 19200, 38400
Data -Parity-Stop Bits
8-None-2, 8-None-1, 8-Odd-2, 8-Even-1
Standards
PI–MBUS–300 Rev. J
Physical connection
RS485
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 32
Table 1 U1000MKII-HM Product Specification.
Temperature sensors
Type
PT100 Class B 4 wire
Range
2 to 85°C (36 to 185°F)
Resolution
0.1°C (32.18°F)
Minimum delta T
0.3°C (32.54°F)
Enclosure
Material
Plastic Polycarbonate
Fixing
Pipe mountable
Degree of Protection
IP54
Flammability Rating
UL94 V-0
Dimensions
250mm x 48mm x 90mm (electronics + guide rail)
Weight
0.5kg
Environmental
Pipe temperature
0°C to 85°C
Operating temperature
(Electronics)
0°C to 50°C
Storage temperature
-10°C to 60°C
Humidity
90% RH at 50°C Max
Display
LCD
2 line x 16 characters
Viewing angle
Min 30°
Active area
58mm (W) x 11mm(H)
Keypad
Format
4 key tactile feedback membrane keypad
Table 1 (cont.) U1000MKII-HM Product Specification.
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 33
13 Appendix II – Default Values
The settings will be configured at the factory for either metric or imperial units.
Parameter
Default Value
Parameter
Default Value
Dimensions
mm
Calibration Factor
1.000
Flow Rate
l / min
Zero Cut-off
0.02 m / s
Pipe ID
50 (mm)
Zero Offset
0.000 l / min
Pulse Output
Off Modbus Address
1
Energy per Pulse
1kWh
Data Rate
38400 baud
Pulse Width
50ms
Parity
None
Damping
20s Stop Bits
2
Table 2 System Default Values (Metric)
Parameter
Default Value
Parameter
Default Value
Dimensions
Inches
Calibration Factor
1.000
Flow Rate
USgal / min
Zero Cut-off
0.07 f / s
Pipe ID
1.969 (inches)
Zero Offset
0.000 USgal / min
Pulse Output
Off Modbus Address
1
Energy per Pulse
1kBTU
Data Rate
38400 baud
Pulse Width
50ms
Parity
None
Damping
20s Stop Bits
2
Table 3 System Default Values (Imperial)
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 34
14 Appendix III – Error and Warning Messages
Error Messages
Error Messages are displayed as a number in the diagnostics menu. Contact Micronics if other
messages appear.
Common Error Message
Error Message
Error Meaning
None or 0
None
2
Hot sensor error
4
Cold sensor error
6
Hot and Cold sensor error
8
No flow signal
10
Hot error and no flow signal
12
Cold error and no flow signal
14
Hot and Cold error no flow signal
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 35
Modbus Error Messages (if modbus fitted)
Test case
Transmitter
Address
Command
Start Register
Length (no of
registers)
CRC-16
[1 byte]
[1 byte]
[2 bytes]
[2 bytes]
[2 bytes]
No error
0x01
0x03
0x00
0x00
0x00
0x20
0x44
0x12
Incorrect function
request
0x01
0x0C
0x00
0x00
0x00
0x20
0x10
0x13
incorrect register start
0x01
0x03
0x00
0xEF
0x00
0x20
0x75
0xE7
Incorrect register length
0x01
0x03
0x00
0x12
0xFF
0x02
0x25
0xFE
slave is busy
0x01
0x03
0x00
0x00
0x00
0x20
0x44
0x12
incorrect CRC-16
0x01
0x03
0x00
0x20
0x00
0x20
0x44
0xFF
Reciever
Comments
Address
Command
Error code
CRC-16
[1 byte]
[1 byte]
[1 byte]
[2 bytes]
0x01
0x03
None
n/a
n/a
Example of a good message
0x01
0x8C
0x01
0x85
0x00
The only acceptable commands are 0x03 and 0x06
0x01
0x83
0x02
0xC0
0xF1
Incorrrect register start
0x01
0x83
0x03
0x01
0x31
Incorrect register length
0x01
0x83
0x06
0xC1
0x32
slave is busy processing and is unable to respond
0x01
0x83
0x07
0x00
0xF2
CRC is incorrect
Flow and temperature errors
A signal strength of less than 40% indicates poor set up of the instrument, and the installation
should be checked or possibly moved to a different site.
If instant Power is zero, there will either be no flow or flow signal to the flow transducers or the delta
T is negative. If this happens check the following.
1. Make sure the temperature sensors are connected and securely on the pipe.
2. Check the display to make sure there is a deta T.
3. Make sure there is flow in the pipe.
4. Check the display to make sure flow signal is not showing “----". If so makes sure flow
sensors are sitting on the pipe, and check for grease or gel pads have been used.
Warnings
These generally advise the user that the data entered is out of the specified range.
1. When an invalid Pipe ID is entered, the warning message shown below is displayed,
prompting the user to enter a value between 20 and 165.1mm, depending on the unit
purchased.
Range 20.0 – 165.1
0.000 mm
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 36
2. When programming a Frequency Pulse output the frequency is limited to the range 1 to 200 Hz. If
an invalid value is entered then the following warning message is displayed.
3. When programming a Volume Pulse output the pulse width is limited to the range 3 to 99ms. If an
invalid value is entered then the following warning message is displayed.
4. When programming the Zero Cut-off this is limited to the range 0.000 to 0.500. If an invalid value
is entered then the following warning message is displayed.
5. When programming the Calibration Factor this is limited to the range 0.5 to 1.5. If an invalid value
is entered then the following warning message is displayed.
6. If an attempt is made to zero the offset between the temperature sensors, and the difference in
temperature is too large then this error message will be displayed.
Ensure the temperature sensors are correctly plugged in and are both at the same temperature.
Updates
25/7/18
Page 13
For safety, connecting the U1000MKII to a power supply via a mains rated transformer is the responsibility of the installer to conform to
the regional voltage safety directives.
Range 1 - 200
200
Range 3 - 99
0000.0
Range 0.00 – 0.500
0000.0
Range 0.500 – 1.500
0000.0
Calibrate Error
Press Enter
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 37
Micronics U1000MKII-HM User Manual
Issue X.X July 18
Page 38
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