Nivetec Micronics U1000-HM Manuale utente

Issue 2.2

Page 1

Micronics U1000-HM

Clamp On Ultrasonic Heat Meter

User Manual

Micronics U1000-HM User Manual

Issue 2.2

Page 2

Table of Contents

1General Description..................................................................................................................................... 3

2Quick Start Procedure ................................................................................................................................. 4

3How does it work? ....................................................................................................................................... 5

4User interface .............................................................................................................................................. 6

4.1 Key switches........................................................................................................................................ 6

5Installing 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 cables............................................................................................................... 13

5.7 Connecting the U1000-HM to the Supply.......................................................................................... 13

5.8 Pulse Output connection.................................................................................................................... 15

5.9 Modbus connections.......................................................................................................................... 15

5.10 Cable Screen..................................................................................................................................... 15

6Powering up for the first time..................................................................................................................... 16

6.1 How to enter the Pipe ID.................................................................................................................... 18

6.2 Pulse output....................................................................................................................................... 19

6.2.1 Volumetric mode........................................................................................................................ 19

6.2.2 Frequency mode........................................................................................................................ 19

6.2.3 Energy........................................................................................................................................ 19

6.2.4 Low Flow Alarm ......................................................................................................................... 19

6.3 Modbus.............................................................................................................................................. 20

7Subsequent Power-ON Sequence ............................................................................................................ 21

7.1 Information screens ........................................................................................................................... 21

8Password Controlled Menus...................................................................................................................... 22

8.1 General procedure for changing menu settings ................................................................................ 22

8.1.1 Selection menus ........................................................................................................................ 22

8.1.2 Data entry menus ...................................................................................................................... 22

8.2 User Password controlled menu structure......................................................................................... 22

9Diagnostics Menu ...................................................................................................................................... 28

10 Relocation of guide rail.......................................................................................................................... 29

11 Appendix I –U1000-HM Specification................................................................................................... 30

12 Appendix II –Default values.................................................................................................................. 32

13 Appendix III –Error and Warning Messages......................................................................................... 33

14 Declaration of conformity ………………………….……………………………………………...……………..33

Micronics U1000-HM User Manual

Issue 2.2

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, copper and plastic pipes with IDs 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

Two sets of self-adhesive Gel pad acoustic couplant

Dual PT 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

Modbus RTU data interface

Typical applications

Domestic, building services and industrial water systems heat metering.

Micronics U1000-HM User Manual

Issue 2.2

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 guidrail 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 30 seconds. 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 8).

12. Clip the electronics assembly on to the guide rail to complete the assembly.

13. If the Modbus interface is being used then the address and data rate of the instrument must

be set using the User Menu. (See Section 8). The default address is 1 and the default data

rate is set to 38400.

Micronics U1000-HM User Manual

Issue 2.2

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

Micronics U1000-HM User Manual

Issue 2.2

Page 6

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 LEDs

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.



Sig : 87% *

246.3 l/min

Micronics U1000-HM User Manual

Issue 2.2

Page 6

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 LEDs

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.



Sig : 87% *

246.3 l/min

Micronics U1000-HM User Manual

Issue 2.2

Page 6

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 LEDs

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.



Sig : 87% *

246.3 l/min

Micronics U1000-HM User Manual

Issue 2.2

Page 7

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 to 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. Flowprofile distortions can result from upstream disturbance such

as bends, tees, valves, pumps and other similar obstructions. To ensure a uniform profile the

transducers must bemounted 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 isa 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 10diameters 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

Valid transducer location

20 x Diameter

10 x Diameter

Micronics U1000-HM User Manual

Issue 2.2

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 flowreadings 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. Preparethe pipe by degreasing it and removingany loose materialor 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 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 material

Plastic and Copper

Steel

Plastic and Copper

Steel

Water

30% Glycol

Separation

Inches

20-24

0.79-0.94

---

20-22

0.79-0.87

25-30

0.98-1.18

20-22

0.79-0.87

23-27

0.91-1.06

0.79

31-36

1.22-1.42

23-28

0.91-1.10

28-33

1.10-1.30

21-26

0.83-1.02

37-42

1.46-1.65

29-34

1.14-1.34

34-38

1.34-1.50

27-31

1.06-1.22

43-48

1.69-1.89

35-40

1.38-1.57

39-44

1.54-1.73

32-37

1.26-1.46

49-54

1.93-2.13

41-46

1.61-1.81

45-50

1.77-1.97

38-42

1.50-1.65

55-60

2.17-2.36

47-52

1.85-2.05

50-55

1.97-2.17

43-48

1.69-1.89

61-65

2.40-2.56

53-58

2.09-2.28

56-61

2.20-2.40

49-53

1.93-2.09

66-71

2.60-2.80

59-64

2.32-2.52

62-66

2.44-2.60

54-59

2.13-2.32

72-77

2.83-3.03

65-70

2.56-2.76

67-72

2.64-2.83

60-64

2.36-2.52

78-83

3.07-3.27

71-76

2.80-2.99

73-77

2.87-3.03

65-70

2.56-2.76

84-89

3.31-3.50

77-82

3.03-3.23

78-83

3.07-3.27

71-76

2.80-2.99

90-95

3.54-3.74

83-88

3.27-3.46

84-88

3.31-3.46

77-81

3.03-3.19

96-101

3.78-3.98

89-94

3.50-3.70

89-94

3.50-3.70

82-87

3.23-3.43

102-107

4.02-4.21

95-100

3.74-3.94

95-99

3.74-3.90

88-92

3.46-3.62

108-110

4.25-4.33

101-106

3.98-4.17

100-105

3.94-4.13

93-98

3.66-3.86

107-110

4.21-4.33

106-110

4.17-4.33

99-103

3.90-4.06

---

104-109

4.09-4.29

110

4.33

Figure 4 Separation Table

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