Micronics U1000-HM User Manual
Micronics U1000-HM User Manual
Issue 1.4 Page 1
Micronics U1000-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 Facsimile: +44(0)1628 531540 E-mail: sales@micronicsltd.co.uk
www.micronicsflowmeters.com
Micronics U1000-HM User Manual
Issue 1.4 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 U1000-HM .................................................................................................................. 7
5.1 Preparation .............................................................................................................................. 8
5.2 Sensor separation ................................................................................................................... 8
5.3 Attaching the U1000-HM to the pipe ..................................................................................... 10
5.4 Adaptors for small pipes ........................................................................................................ 11
5.5 Attaching the Temperature sensors ...................................................................................... 12
5.6 U1000-HM interface cable .................................................................................................... 13
5.7 Connecting the U1000-HM to the Supply ............................................................................. 13
5.8 Pulse Output connection ....................................................................................................... 13
5.9 Modbus connections ............................................................................................................. 13
5.10 Cable Screen......................................................................................................................... 14
6 Powering up for the first time ........................................................................................................ 14
6.1 How to enter the Pipe ID ....................................................................................................... 16
6.2 Pulse output .......................................................................................................................... 17
6.2.1 Volumetric mode ........................................................................................................... 17
6.2.2 Frequency mode ........................................................................................................... 17
6.2.3 Energy ........................................................................................................................... 17
6.2.4 Low Flow Alarm ............................................................................................................. 17
6.3 Modbus .................................................................................................................................. 18
7 Subsequent Power-ON Sequence ................................................................................................ 18
7.1 Information screens ............................................................................................................... 19
8 Password Controlled Menus ......................................................................................................... 20
8.1 General procedure for changing menu settings .................................................................... 20
8.1.1 Selection menus ............................................................................................................ 20
8.1.2 Data entry menus .......................................................................................................... 20
8.2 User Password controlled menu structure ............................................................................ 20
9 Diagnostics Menu .......................................................................................................................... 25
10 Relocation of guide rail .............................................................................................................. 26
11 Appendix I – U1000-HM Specification ...................................................................................... 27
12 Appendix II – Default values ..................................................................................................... 28
13 Appendix III – Error and Warning Messages ............................................................................ 29
14 Declaration of conformity ………………………….……………………………………………...……30
Micronics U1000-HM User Manual
Issue 1.4 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
Operates on steel, copper and plastic pipes with ID’s in the range 20mm (0.8”) to
110mm (4”) and a maximum wall thickness limit of 9mm for metal pipes and 10.5mm
for plastic.
Simple to install temperature sensors
Compact, rugged and reliable, the U1000-HM has been designed to provide sustained
performance in industrial environments
.
U1000 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
Dual PT type temperature sensors (standard cable length 5m)
Continuous signal monitoring
Password protected menu operation for secure use
Operates from external 12 to 24Vac or dc power supplies
Small pipe adaptors
Modbus RTU data output
Typical applications
Domestic, building services and industrial water systems heat metering.
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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. 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)
2. Determine the pipe internal diameter and material.
3. Either use the table in the manual, or power up the instrument to determine the correct
separation code. (See Sections 5.2 or 6)
4. 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)
5. 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)
6. Grease the sensors and mount the guide rail on the pipe using the banding provided,
then remove the sensor holding screws. (See Section 5.3)
7. Wire the electronics up to a 12 to 24V ac or dc power supply via the Blue and Brown
wires. (See Section 5.7)
8. Plug in the temperature sensors and place them touching each other. Wait for the
temperature readings to stabilize, indicated by no change for 30 seconds. Then zero
the temperature sensors. (See Section 5.5)
9. 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)
10. Plug in the flow sensors and clip the electronics assembly on to the guide rail.
11. Power up the instrument and check that flow and temperature readings can be
obtained(See Sections 6 and 7.1)
12. Once good readings have been obtained any further changes, such as selecting
different units, can be made via the User Menu. (See Section 8)
13. If the Modbus output is being used then the address of the instrument must be set
using the User Menu. (See Section 8) The default address is 1 and the Baud rate is
set to 38400; slower Baud rates can be set.
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Issue 1.4 Page 5
3 How does it work?
The U1000-HM is a clamp-on, ultrasonic flowmeter that uses a multiple slope 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
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4 User interface
Figure 2 illustrates the U1000-HM user interface comprising:-
One 2 line x 16 character LCD with backlight
Four tactile key switches
Two LED’s
4.1 Key switches
kWh LED, this pulses each time an energy pulse is sent by the instrument.
Pulse Enabled LED is illuminated when the Pulse output is ON.
Figure 2 U1000-HM User Interface
Selection key. Allows the user to select between options on the
display.
Used to decrement the value of each digit in numeric entry fields.
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.
V
Sig : 87% *
246.3 l/min
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5 Installing the U1000-HM
Figure 3 Location of Transducers
For correct measurement of the energy transfer being measured by the instrument the flow
measurement needs to be made on the hot side of the system as near the hot temperature
sensor as possible.
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 U1000-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
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Issue 1.4 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 sensor must be positioned at the correct distance for the pipe size and type they will be
used on. The table below gives the typical separation code for a given pipe material and Inside
diameter, based on a 4mm wall thickness. 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 range
Pipe material
Separation
Plastic and
Copper
Steel
Plastic and
Copper
Steel
Water
30% Glycol
B1
20-24
---
20-22
A2
25-30
20-22
23-27
20
C1
31-36
23-28
28-33
21-26
B2
37-42
29-34
34-38
27-31
A3
43-48
35-40
39-44
32-37
C2
49-54
41-46
45-50
38-42
B3
55-60
47-52
50-55
43-48
D2
61-65
53-58
56-61
49-53
C3
66-71
59-64
62-66
54-59
B4
72-77
65-70
67-72
60-64
D3
78-83
71-76
73-77
65-70
C4
84-89
77-82
78-83
71-76
E3
90-95
83-88
84-88
77-81
D4
96-101
89-94
89-94
82-87
F3
102-107
95-100
95-99
88-92
E4
108-110
101-106
100-105
93-98
D5
---
107-110
106-110
99-103
F4
---
---
---
104-109
E5
110
Figure 4 Separation Table
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The diagram below shows how to adjust the separation of the sensors
Figure 5 Separation Setting
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Issue 1.4 Page 10
5.3 Attaching the U1000-HM to the pipe
Follow the five steps shown in Figure 6 below to attach the U1000-HM to the pipe.
Figure 6 simple steps to attaching the U1000-HM on the pipe
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 for the procedure to do this.
The grease provided in the syringe is applied
to the centre of the sensors as shown above.
Clamp guide rail and sensor assembly to pipe,
using the supplied banding, and release
sensor locking screws.
Connect power and sensors to the electronics
assembly. Sensor leads can be connected
either way round.
Click electronic assembly onto guide rails and
sensor assembly
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