Dwyer Instruments UFM2 Manual de usuario

Issue 1.1

UFM2/UBT

UFM2: Clamp-on Ultrasonic Flow Meter

UBT: Clamp-on Ultrasonic Heat Meter

User Manual

UBT shown

DWYER INSTRUMENTS, INC.

102 INDIANA HWY 212

MICHIGAN CITY

INDIANA 46360

USA

Phone: 219-879-8000

Fax: 219-872-9057

Web: www.dwyer-inst.com

Email: info@dwyer-inst.com

 UFM2/UBT User Manual 
Issue 1.1b July 20 Page i 
CONTENTS 
1INTRODUCTION....................................................................................... 1 
1 General Description............................................................................................................1 
2 How Does It Work?.............................................................................................................2 
3 Package Contents ..............................................................................................................3 
4 Display................................................................................................................................4 
5 Quick Start Procedure ........................................................................................................5 
2INSTALLATION......................................................................................... 6 
1 Identify Suitable Location....................................................................................................6 
1.1 Additional Considerations for Locating UBT.................................................................6 
1.2 Clean the Pipe’s Flow Sensor Contact Area ................................................................7 
2 Connect Power and Signal Cables .....................................................................................7 
2.1 Power Supply ..............................................................................................................7 
2.2 Pulse Output Connection.............................................................................................8 
2.3 Current Output (UFM2 only) ........................................................................................8 
2.4 Modbus Connections (if fitted) .....................................................................................8 
2.5 Temperature Sensor Probes (UBT only)....................................................................10 
3 Switch On.........................................................................................................................11 
3.1 UFM2 ........................................................................................................................11 
3.2 UBT...........................................................................................................................12 
4 Adjust Flow Sensor Separation.........................................................................................13 
5 Apply Gel Pads.................................................................................................................13 
6 Clamp Sensor Assembly to Pipe.......................................................................................14 
6.1 Pipe Adaptors............................................................................................................14 
6.2 Attaching to Pipe .......................................................................................................15 
7 Remove Sensor-Holding Screws......................................................................................16 
8 Connect Electronics Module.............................................................................................16 
9 Attach the Temperature Sensors (UBT Only)....................................................................17 
10 Normal Operation .............................................................................................................18 
10.1 UFM2 ........................................................................................................................18 
10.2 UBT...........................................................................................................................18 
10.3 Troubleshooting the Flow Reading ............................................................................19 
11 Clip Electronics Module to Sensor Assembly....................................................................19 
3MENUS.................................................................................................... 20 
1 Accessing the Menus........................................................................................................20 
2 Setup Menu......................................................................................................................21 
3 Modbus Menu...................................................................................................................22 

UFM2/UBT User Manual 
Page ii Issue 1.1b July 20 
4 Current Output Menu (UFM2 only)....................................................................................23 
5 Pulse Output Menu...........................................................................................................24 
6 Calibration Menu ..............................................................................................................25 
7 Volume Totals Menu.........................................................................................................26 
8 Diagnostics Menu.............................................................................................................27 
4OUTPUTS................................................................................................ 28 
1 Pulse Output.....................................................................................................................28 
1.1 Volumetric Pulse........................................................................................................28 
1.2 Frequency Mode........................................................................................................29 
1.3 Energy Pulse (UBT only) ...........................................................................................29 
1.4 Flow Alarm - Low Flow ..............................................................................................29 
1.5 Flow Alarm –Signal Loss ..........................................................................................29 
24-20 mA Current Output (UFM2 only, if fitted)...................................................................29 
3 Modbus (if fitted)...............................................................................................................30 
5RELOCATING THE UNIT......................................................................... 33 
6APPENDIX .............................................................................................. 34 
1 Specification.....................................................................................................................34 
2 Default values...................................................................................................................36 
3 Limitations with Water-Glycol Mixtures .............................................................................36 
4 Positioning........................................................................................................................36 
5 Error and Warning Messages ...........................................................................................38 
5.1 Error Messages.........................................................................................................38 
5.2 Example Error Messages...........................................................................................38 
5.3 Modbus Error Messages (if Modbus fitted) ................................................................39 
5.4 Flow Errors................................................................................................................39 
5.5 Flow Warnings...........................................................................................................39 
5.6 Data Entry Errors.......................................................................................................40 
 
 

UFM2/UBT User Manual

Issue 1.1b July 20 Page 1

1INTRODUCTION

1.1 General Description

This manual describes the installation and use of the UFM2 flow meter and UBT energy meter:

•UFM2 is an ultrasonic clamp-on flow meter for measuring flow rate and total flow with a volume

pulse output and optional Modbus or 4-20 mA flow proportional output. It can be used as a

standalone meter or as part of an integral management system.

•UBT is an ultrasonic clamp-on thermal, heat/energy meter. It uses ultrasound to measure flow

rate and is also equipped with PT100 temperature sensors to measure flow and return

temperatures. The energy meter displays energy rate and totalised energy with pulse output

and communication options, so it can be used as a standalone meter or as an integral part of

Automatic Monitoring & Targeting (aM&T) or a Building Energy Management System (BEMS).

The electronics and sensor housings form an integral unit which attaches to the pipe using the

supplied hose clips. Power to the unit is provided by an external 12-24 VDC / 24 VAC power supply

(7 W / 7 VA minimum). The unit operates on steel, stainless steel, copper and plastic pipes with

internal diameter in the range 0.8” (20 mm) to 6.5” (165 mm) depending on the product purchased.

The models can also be supplied with Modbus digital communication options.

Typical applications:

UFM2

UBT

Hot water metering and flow measurement

Flow measurement for heat metering

Flow measurement for Energy Metering

Chilled water metering and flow measurement

Potable water metering and flow measurement

Process water metering and flow measurement

Ultra-pure water metering and flow

measurement.

NOTE:

The UBT default configuration is:

•Instrument Type: Heating

•Installation Side: Return

•Fluid: Water

Return refers to the location of the flow measurement relative to flow circuit.

UFM2/UBT User Manual

Page 2 Issue 1.1b July 20

1.2 How Does It Work?

The UFM2 and UBT meters use 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 (blue) 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 Figure 1. The speed at which the ultrasound is transmitted

through the liquid is accelerated slightly by the velocity of the liquid through the pipe. The

subsequent time difference T1 –T2 is directly proportional to the liquid flow velocity.

With the UBT, two temperature sensors measure the difference in temperature between the supply

and return of the flow system being monitored. The temperature difference, in combination with the

volume of water that has flowed through the system, is then used to calculate the energy transferred

to or from the water.

Figure 1 Principle of Transit-Time operation

UFM2/UBT User Manual

Issue 1.1b July 20 Page 3

1.3 Package Contents

The unit consists of two parts:

1. Sensor Assembly

Incorporating guide rails and two transducers for flow measurement.

2. Electronics Module

Consisting of the keypad and display, power, signal and Modbus connections. The Electronics

Module clips onto the Sensor Assembly.

In addition, the kit contains:

3. Adhesive gel pads (4)

4. 2-part adaptors for fixing sensor assembly to pipes with an OD less than 2 ½" (75 mm) (2).

5. UBT only: Non-releasable stainless cable ties for temperature sensors (2)

6. Quick release clamps for use with pipes with an OD of ¾ - 2 ½" (25-75 mm) (2)

7. Quick release clamps for use with pipes with an OD of 2 –5" (63-140 mm) (2)

8. UBT only: PT100 temperature sensors with cable (9.8' (3 m)) (2)

9. Modbus cable (optional)

The kit also contains a copy of this manual.

Figure 2 Package Contents

UFM2/UBT User Manual

Page 4 Issue 1.1b July 20

1.4 Display

The meter display comprises:

•One 2-line x 16 character LCD with backlight

•Four tactile key switches

•Two LEDs

Figure 3 Display (UBT model shown)

BTU (UBT)

Energy pulse signal

4-20 mA (UFM2)

4-20 mA signal.

Pulse

Illuminated when the

Pulse, Frequency or

Alarm functions are

enabled.

Select

Selection key.

Choose between

options on the

display.

Decrease/Down

Decrement the

value of each

digit in numeric

entry fields/move

menu down.

Increase/Up

Increment the

value of each

digit in numeric

entry

fields/move

menu up.

Enter

Enter displayed

selection/

terminate the

data entry.

Select menu or

exit to Flow

Reading screen.

Flow

Measured flow.

Signal strength

For accurate

results, must be

over 40%.

Flow Units

Units applicable to

measured flow.

Flow Direction

* Indicates positive

flow

! Indicates

reversed flow.

 UFM2/UBT User Manual 
Issue 1.1b July 20 Page 5 
1.5 Quick Start Procedure 
The following procedure summarises the steps required to set up the meter. Please refer to the 
referenced sections for full details. 
1. Identify a suitable location for the meter on a straight length of pipe clear of bends and valves or 
similar obstructions (See pages 6 and 36). 
2. Electronics Module: 
a. Connect to a 12 –24 VDC or 24 VAC power supply (7 W / 7 V minimum per 
instrument) using the Blue and Brown wires. (See page 7). 
b. Switch on and program to determine the correct separation code. (see page 11). 
3. Sensor Assembly: 
a. Loosen but do not remove the two sensor-holding screws to lower the flow sensors 
so they can slide along the Sensor Assembly’s internal guide rail (see page 13). 
b. Set the flow sensors to the correct separation (see page 13). 
c. Tighten the sensor-holding screws. 
d. Apply the gel pads to the sensors (see page 13). 
e. Mount the Sensor Assembly onto the pipe using the supplied hose clips 
(see page 15). 
If the pipe has an OD less than 2 ½" (75 mm), use the adaptors provided (see page 
14). 
f. Remove the sensor-holding screws (see page 16). 
4. Connect the two wires from the Sensor Assembly to the Electronics Module (see page 16). 
DO NOT CLIP THE ELECTRONICS MODULE ONTO THE SENSOR ASSEMBLY AT 
THIS STAGE. THE ELECTRONICS MODULE CAN BE FULLY CLIPPED DOWN LATER 
ONCE ALL MEASUREMENTS HAVE BEEN CHECKED. 
5. UBT only: Plug in the temperature sensors to the Electronics Module (see page 17) and attach 
the PT100 sensors to the flow and return pipes (see Section 2.1.1, page 6). 
6. Check that flow readings can be obtained (see page 18). 
7. Clip the Electronics Module to the Sensor Assembly and tighten the side screw to complete 
assembly (see page 19). 
 
To use the Pulse Output features, see page 28. 
To use the 4-20 mA Output, see page 29 (UFM2 only). 
To use the Modbus interface, see page 30. The address, data rate, and configuration of the 
instrument must be set using the Modbus Menu (see page 22). The default address is 1, the default 
data rate is 38400 baud, and the default Comms configuration is 8-None-2. 
 

UFM2/UBT User Manual

Page 6 Issue 1.1b July 20

2INSTALLATION

2.1 Identify Suitable Location

We recommend a location where there is a straight length of pipe with no bends, constrictions or

obstructions within at least 10 times the pipe diameter upstream, and 5 times the pipe diameter

downstream.

Figure 4 Identifying a suitable location

IMPORTANT: DO NOT EXPECT TO OBTAIN ACCURATE RESULTS IF THE UNIT IS

POSITIONED CLOSE TO ANY OBSTRUCTION THAT DISTORTS THE UNIFORMITY OF

THE FLUID FLOW PROFILE (SEE PAGE 36). DWYER INSTRUMENTS INC. ACCEPTS

NO RESPONSIBILITY OR LIABILITY IF PRODUCT HAS NOT BEEN INSTALLED IN

ACCORDANCE WITH THESE INSTRUCTIONS.

2.1.1 Additional Considerations for Locating UBT

For optimum reliability on boiler applications, the flow measurement needs to be made on the cold

side of the system. For optimum reliability in chiller applications, the flow measurement needs to be

made on the warmer side of the system.

Figure 5 Typical setup of UBT for boiler applications

UPSTREAM

10 x pipe

diameter

DOWNSTREAM

5 x pipe

diameter

UFM2/UBT

fluid flow

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