Nivetec U1000MKII-HM Manuale utente

Issue 1.3 Apr 19

Page 1

Micronics U1000MKII

-HM

Clamp O

n Ultrasonic Heat M

eter

User Manual

U1000MKII-HM User Manual

Issue 1.3 Apr 19

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 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..................................................................................................................................... 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 Mode ............................................................................................................................. 19

6.2.4 Flow Alarm –High/Low Flow or Signal Loss ............................................................................. 19

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

7Subsequent Power-ON Sequence ............................................................................................................ 22

8Information Screens................................................................................................................................... 22

9Password Controlled Menus...................................................................................................................... 23

9.1 General Procedure For Changing Menu Settings ............................................................................. 23

9.1.1 Selection Menus ........................................................................................................................ 23

9.1.2 Data Entry Menus...................................................................................................................... 23

9.2 User Password Controlled Menu Structure ....................................................................................... 23

10 Diagnostics Menu .................................................................................................................................. 29

11 Relocation Of Guide Rail....................................................................................................................... 31

12 Appendix I –U1000MKII-HM Specification ........................................................................................... 32

13 Appendix II –Default Values ................................................................................................................. 34

14 Appendix III –Error and Warning Messages......................................................................................... 35

13 Declaration of conformity ………………………….……………………………………………...……………..36

U1000MKII-HM User Manual

Issue 1.3 Apr 19

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

U1000MKII-HM User Manual

Issue 1.3 Apr 19

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.

U1000MKII-HM User Manual

Issue 1.3 Apr 19

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

U1000MKII-HM User Manual

Issue 1.3 Apr 19

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.

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.



U1000MKII-HM User Manual

Issue 1.3 Apr 19

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

Valid transducer location

20 x Diameter

10 x Diameter

U1000MKII-HM User Manual

Issue 1.3 Apr 19

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

Water

Glycol

PipeID

Pipe ID

Water

Glycol

inches

S/Steel

inches

M/Steel

20-22

0.79-0.87

A-3

21-22

0.83-0.87

C-3

26-29

1.02-1.14

B-2

1.06

D-2

E-3

34-36

1.34-1.42

C-2

C-4

35-36

1.38-1.42

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

59-64

2.32-2.52

A-3

F-3

62-65

2.44-2.56

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

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

Water

Glycol

Pipe ID

Water

Glycol

inches

PVC U

inches

Copper

22-23

0.87-0.90

C-3

20-39

0.79-1.54

B-1

27-28

1.06-1.10

D-2

C-3

20-39

0.79-1.54

B-1

36-37

1.42-1.45

C-4

20-39

0.79-1.54

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

47-53

1.85-2.09

C-1

67-69

2.64-2.71

E-4

D-5

61-67

2.40-2.64

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

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

143-149

5.63-5.87

F-4

E-5

157-162

6.18-6.34

G-4

F-5

Figure 4 Separation Table

U1000MKII-HM User Manual

Issue 1.3 Apr 19

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.

U1000MKII-HM User Manual

Issue 1.3 Apr 19

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.

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