Micronics U1000-U User Manual
Issue 1.5 Feb 17 Page 1
U1000-U
Ultrasonic Flowmeter
(Universal)
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
Issue 1.5 Feb 17 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-U ................................................................................................................................................. 7
5.1 Preparation.......................................................................................................................................................... 8
5.2 Sensor separation ................................................................................................................................................ 8
5.3 Adaptors for small pipes ................................................................................................................................... 10
5.4 Attaching the U1000 to the pipe ....................................................................................................................... 11
5.5 U1000-U interface cable ................................................................................................................................... 12
5.6 Connecting the U1000-U to the Supply ............................................................................................................. 12
5.7 Pulse Output connection ................................................................................................................................... 13
5.8 Current Output (If fitted) .................................................................................................................................. 13
5.9 Cable Screen ...................................................................................................................................................... 13
6 Powering up for the first time .................................................................................................................................... 14
6.1 How to enter the Pipe ID ................................................................................................................................... 15
6.2 Pulse output ...................................................................................................................................................... 16
6.2.1 Volumetric mode ...................................................................................................................................... 16
6.2.2 Frequency mode ....................................................................................................................................... 16
6.2.3 Low Flow Alarm ........................................................................................................................................ 16
6.2.4 Loss of Flow Reading Alarm ...................................................................................................................... 16
6.3 4-20mA Current output (If fitted) ..................................................................................................................... 17
7 Subsequent Power-ON Sequence .............................................................................................................................. 17
8 Password Controlled Menus ...................................................................................................................................... 17
8.1 General procedure for changing menu settings ................................................................................................ 18
8.1.1 Selection menus ....................................................................................................................................... 18
8.1.2 Data entry menus ..................................................................................................................................... 18
8.2 User Password controlled menu structure ....................................................................................................... 19
9 Diagnostics Menu ....................................................................................................................................................... 24
10 Relocation of guide rail .......................................................................................................................................... 25
11 Appendix I – U1000-U Specification ...................................................................................................................... 26
12 Appendix II – Default values .................................................................................................................................. 27
13 Appendix III – Error and Warning Messages .......................................................................................................... 28
13 Declaration of Conformity ………………………………………………………………………………………………………………..………………….29
Issue 1.5 Feb 17 Page 3
1 General Description
Fixed installation, clamp-on flowmeter
Easy to install
Requires the minimum of information to be entered by the user
Both the electronics and guide rail housings form an integral unit
Simple attachment 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 ID’s in the range 20mm (0.8”) to 110mm
(4.3”) and a maximum wall thickness of 9mm for metal pipes and 10.5mm for plastic.
Compact, rugged and reliable, the U1000-U has been designed to provide sustained
performance in industrial environments.
U1000-U standard features include:
2 line x 16 character LCD with backlight
4-key keypad
Isolated pulse output
Simplified guide rail and transducer assembly
Two sets of self- adhesive Gel pad acoustic couplant
Continuous signal monitoring
Password protected menu operation for secure use
Operates from external 12 to 24Vac or dc power supplies
Small pipe adaptors
Optional features
4-20mA current output
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.
Issue 1.5 Feb 17 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. 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 5.3)
6. Apply the Gel pads or couplant to the sensors and mount the guide rail on the pipe using the banding
provided, then remove the sensor holding screws. (See Section 5.4)
7. 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 5.6)
8. Plug in the flow sensors and DO NOT clip the electronics assembly on to the guide rail at this stage.
9. Power up the instrument and check that flow readings can be obtained(See Sections 6 and 7)
10. Once good readings have been obtained any further changes, such as selecting different units, can be
made via the User Menu. (See Section 8)
11. When happy with set up and readings, clip the electronic assembly to the guide rail.
Issue 1.5 Feb 17 Page 5
3 How does it work?
The U1000-U 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 (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.
Figure 1 Principle of Transit-Time operation
Issue 1.5 Feb 17 Page 6
4 User interface
Figure 2 illustrates the U1000-U user interface comprising:-
One 2 line x 16 character LCD with backlight
Four tactile key switches
Two LED’s
4.1 Key switches
4-20mA LED is illuminated when the 4-20mA output is ON
Pulse LED is illuminated when the Pulse output or Frequency output are enabled, and
then flashes to indicated active pulse activity. It is also illuminated if an alarm is enabled
and active.
Figure 2 U1000-U User Interface
Selection key. Allows the user to select between options on the
display.
Used to increment the value of each digit in numeric entry fields.
Used to decrement 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
Λ
Issue 1.5 Feb 17 Page 7
5 Installing the U1000-U
Figure 3 Location of Transducers
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 also 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-U 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
45°
Issue 1.5 Feb 17 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.
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
B1
20-24
---
A2
25-30
20-22
C1
31-36
23-28
B2
37-42
29-34
A3
43-48
35-40
C2
49-54
41-46
B3
55-60
47-52
D2
61-65
53-58
C3
66-71
59-64
B4
72-77
65-70
D3
78-83
71-76
C4
84-89
77-82
E3
90-95
83-88
D4
96-101
89-94
F3
102-107
95-100
E4
108-110
101-106
D5
---
107-110
Figure 4 Separation Table
Issue 1.5 Feb 17 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.
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