Micronics U1000 User Manual

Micronics U1000 User Manual

Issue 2.0 Page 1

Micronics U1000

Ultrasonic Flowmeter

User Manual

Micronics Ltd, Knaves Beech Business Centre, Davies Way, Loudwater,

High Wycombe, Bucks HP10 9QR

Telephone: [phone] Facsimile: [phone] E-mail: [e-mail]

www.micronicsflowmeters.com

Micronics U1000 User Manual

Issue 2.0 Page 2

Table of Contents

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

2 How does it work? .......................................................................................................................... 4

3 User interface .................................................................................................................................. 5

3.1 Key switches ............................................................................................................................ 5

4 Installing the U1000 ........................................................................................................................ 5

4.1 Preparation ............................................................................................................................. 6

4.2 Attaching the U1000 to the pipe ............................................................................................ 7

4.3 Adaptors for small pipes ......................................................................................................... 8

4.4 U1000 interface cable ............................................................................................................. 9

4.5 Connecting the U1000 to the Supply ...................................................................................... 9

4.6 Pulse Output connection ........................................................................................................ 9

4.7 Current Output (When fitted) .............................................................................................. 10

4.8 Cable Screen .......................................................................................................................... 10

5 Powering up for the first time ....................................................................................................... 10

5.1 How to enter the Pipe ID ...................................................................................................... 11

5.2 Pulse output .......................................................................................................................... 12

5.2.1 Volumetric mode .......................................................................................................... 12

5.2.2 Frequency mode ........................................................................................................... 12

5.3 4-20mA Current output (When fitted) .................................................................................. 12

6 Subsequent Power-ON Sequence ................................................................................................. 12

7 Password Controlled Menus ......................................................................................................... 13

7.1 General procedure for changing menu settings ................................................................... 13

7.1.1 Selection menus ............................................................................................................ 13

7.1.2 Data entry menus .......................................................................................................... 14

7.2 User Password controlled menu structure ........................................................................... 14

8 Diagnostics Menu .......................................................................................................................... 19

9 Relocation of guide rail ................................................................................................................. 20

10 Appendix I – U1000 Specification ............................................................................................. 21

11 Appendix II – Default values ..................................................................................................... 22

12 Appendix III – Error and Warning Messages ............................................................................. 23

12.1 System errors ........................................................................................................................ 23

12.2 Errors ..................................................................................................................................... 23

12.3 Warnings ............................................................................................................................... 23

13 Declaration of Conformity ……………………………………………………………………………………………………….. 25

Micronics U1000 User Manual

Issue 2.0 Page 3

1 General Description

The U1000 is a fixed installation, clamp-on flowmeter that is easy to install and requires the
minimum of information to be entered by the user. Unlike other clamp-on flowmeters, the
U1000 transducer separation distance is factory preset to a nominal pipe size. Both the
electronics and guide rail housings form an integral unit that is attached to the pipe using the
supplied jubilee clips. Power to the unit is provided by an external 12 - 24V ac/dc power
supply. The U1000 is intended to operate on steel and plastic pipes with ID’s in the range
20mm (0.8”) to 110mm (4”).

Compact, rugged and reliable, the U1000 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
 Simplified factory configured guide rail and transducer assembly
 Continuous signal monitoring
 Password protected menu operation for secure use
 Operates from external 12 to 24Vac or dc power supplies

Optional features

 4-20mA current output
 Small pipe adaptors

Typical applications

 Hot water metering and flow measurement
 Flow measurement for Heat 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.

Micronics U1000 User Manual

Issue 2.0 Page 4

2 How does it work?

The U1000 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.

Figure 1 Principle of Transit-Time operation

Micronics U1000 User Manual

Issue 2.0 Page 5

3 User interface

Figure 2 illustrates the U1000 user interface comprising:-

 One 2 line x 16 character LCD with backlight
 Four tactile key switches
 Two LED’s

3.1 Key switches

4-20mA LED is illuminated when the 4-20mA output is ON

Pulse LED is illuminated when the Pulse output is ON

4 Installing the U1000

Figure 3 Location of Transducers

Figure 2 U1000 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 will take the user to another menu or to
the Flow Reading screen.

V

Possible Air

Possible
sludge

Guide
rail

Uniform Flow Profile

Distorted Flow Profile

Flow

Flow

Valid transducer location

20 x Diameter

10 x Diameter

45°

Micronics U1000 User Manual

Issue 2.0 Page 6

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 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.

4.1 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.

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.

Micronics U1000 User Manual

Issue 2.0 Page 7

4.2 Attaching the U1000 to the pipe

Follow the four steps shown in Figure 4 below to attach the U1000 to the pipe.

Figure 4 simple steps to attaching the U1000 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 key, 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

Micronics U1000 User Manual

Issue 2.0 Page 8

4.3 Adaptors for small pipes

Figure 5 Pipe Adaptors

Guide rails for small pipes are supplied with adaptors. The diagrams above shows how these are
fitted around the pipe. The top pipe adaptor clips into the ends of the guide rail.

Less than 40mm outside diameter

40 to 60mm outside diameter

Greater than 60mm outside diameter