Ultraflux UF 831 User manual

NT UF 831 CO GB (b) / March 2014
Uf 831 CO & RV
(open channel or river)
User manual
Bâtiment Texas –Éragny Parc
9, Allée Rosa Luxemburg
95610 ÉRAGNY SUR OISE, FRANCE
Tel.: [phone]
Fax: [phone]

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NT UF 831 CO GB (b) / March 2014
2012 ULTRAFLUX S.A.
All rights reserved. No part of this document may be reproduced without prior written
authorization from ULTRAFLUX S.A. ULTRAFLUX, UF 831 are registered trademarks of ULTRAFLUX
S.A.
With a view to the constant improvement of its products, Ultraflux reserves the right to modify
them without notice. Furthermore, Ultraflux shall not be held responsible for any error which may
be present in its documentation despite the care taken in its production.
The UF 831 flow meter complies with the current regulations of the European Community and
bears the CE compliance mark.

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TABLE OF CONTENTS
Note: A detailed table of contents is provided at the end of the manual.
Important: If you are unfamiliar with the transit time difference measuring technique, we recommend you start by
reading our training manual "Ultrasonic transit time flowmeter".
CHAPTER 1: OVERVIEW ........................................................................................ 5
1.1 Inputs/Outputs ...................................................................................................................6
1.2 Communication with the flow meter......................................................................................6
1.3 Recording possibilities .........................................................................................................6
1.4 Echo display .......................................................................................................................6
1.5 Other functions available .....................................................................................................7
1.6 Accuracy and availability......................................................................................................7
1.7 Dimensions and weight........................................................................................................7
1.8 Supply ...............................................................................................................................8
1.9 Protection against dust and immersion..................................................................................8
1.10 Power supply....................................................................................................................8
1.11 Environment for use of the cabinet .....................................................................................9
1.12 Cleaning the flow meter.....................................................................................................9
1.13 Composition of a measuring point.......................................................................................9
CHAPTER 2: SAFETY INSTRUCTIONS ................................................................. 10
2.1 Symbols used on the flow meter......................................................................................... 11
2.2 Assembly ......................................................................................................................... 11
2.3 Wiring.............................................................................................................................. 12
2.4 Using the flow meter......................................................................................................... 12
2.5 Recycling the flow meter ................................................................................................... 13
2.6 Contact address................................................................................................................ 13
CHAPTER 3: INSTALLATION AND WIRING......................................................... 14
3.1 Opening the cabinet.......................................................................................................... 15
3.2 General procedures........................................................................................................... 16
CHAPTER 4: IMPLEMENTING A MEASURING POINT.......................................... 22
4.1 Choosing the measurement location ................................................................................... 23
4.2 Installing the probes ......................................................................................................... 23
4.3 Measurements to be taken on site ...................................................................................... 24
4.4 Analysing and processing data measured on site.................................................................. 24
4.5 Transferring the data collected to the converter................................................................... 25

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CHAPTER 5: USING AND CONFIGURING THE UF 831 ........................................ 26
5.1 Using the UF 831 .............................................................................................................. 27
5.2 Main configuration elements .............................................................................................. 29
5.3 Configuring the UF 831...................................................................................................... 32
5.4 SIMPLE configuration ........................................................................................................ 33
5.5 NORMAL configuration mode.............................................................................................. 49
5.6 ADVANCED configuration mode.......................................................................................... 53
5.7 Measurement mode/displays.............................................................................................. 56
CHAPTER 6: FUNCTION ENGINE......................................................................... 59
6.1 Principle........................................................................................................................... 60
6.2 Example of application....................................................................................................... 60
CHAPTER 7: PC SOFTWARE ................................................................................ 61
7.1 Introduction ..................................................................................................................... 62
7.2 Archiving, processing and printing of saved files................................................................... 76
7.3 Settings files..................................................................................................................... 76
Appendix 1: Characteristic echo signals............................................................. 77
Appendix 2: Speed of sound in water................................................................. 80
Appendix 3: Troubleshooting ............................................................................. 82
Diagnosis indications............................................................................................................... 83
Description of the fault bits...................................................................................................... 85
Fault grid............................................................................................................................... 88
Appendix 4: Link protocol of the UF 831 ............................................................ 89
Serial link characteristics ......................................................................................................... 90
Reading of N words (with N ≤ 125).......................................................................................... 91
JBUS/MODBUS table............................................................................................................... 92
CRC16 calculation algorithm .................................................................................................... 98
Appendix 5: Wiring ............................................................................................. 99
Wiring of ultrasonic probes.................................................................................................... 100
Wiring of the inputs - outputs ................................................................................................ 101
Wiring of the communication port .......................................................................................... 103
Supply wiring ....................................................................................................................... 104

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CHAPTER 1: OVERVIEW

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UF 831 flow meters are ultrasonic flow meters used to measure open channel flows using the transit time
difference method.
The measurement can be taken using an installation with up to 8 ultrasonic measurement chords. (One
chord designates the acoustic path between two probes, each alternating between emitting and receiving.
The use of several chords is above all required when the hydraulic conditions are poor and high accuracy is
required).
1.1 Inputs/Outputs
In addition to the links with the probes, UF 831 converters offer the following possibilities:
Integration of up to 10 single modules (or 5 double modules) of inputs/outputs.
Connection of the inputs/outputs to the equipment, which is made directly on the base of the
cabinet via connectors, without the need for any intervention inside the flow meter.
The modules are put in place by Ultraflux in the factory.
1.2 Communication with the flow meter
UF 831 has a serial link, which can be configured by RS232 or RS485 wiring. For this communication
interface, the standard protocol chosen is the Slave JBUS (MODBUS). This is used to connect the flow meter
to an instrumentation and control system or to a computer (Ultraflux provides PC software compatible with
Windows XP or later, allowing you to configure the flow meter, unload the logger and display the values
measured).
As an option, communication modules managing the following protocols may be installed on request:
MODBUS TCP (Ethernet)
MODBUS RTU
Important: This option must be requested on ordering, since it requires a specific cabinet.
A USB interface on the front panel allows a computer to be connected for the configuration. This is only
accessible with the door open.
1.3 Recording possibilities
The flow meter is used to record the measurement data (logger function). Up to 30 variables can be
recorded (for example: average flow, minimum flow, maximum flow, water level). A total of 530,000
readings can be recorded.
1.4 Echo display
It is possible to display the measurement echo for each chord, which allows you in particular to check the
quality of the measurement and directly view the effect of certain corrective actions (positioning and
alignment of the probes, adjustment of the settings, cleaning of the probes, etc.).

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1.5 Other functions available
Four flow volume totalizers which can count the positive flows, the negative flows or the total flows,
regardless of their sign,
Filtering of the measurement using a first-order filter allowing the non-significant flow fluctuations to
be smoothed,
Storage of the measurement in memory in the event of a momentary loss of the echo (due, for
example, to the passing of air bubbles) or other faults (adjustable storage interval),
Setting the measurement to zero if the flow is below a programmable value,
Readjustment of the zero if it is possible to completely stop the flow.
1.6 Accuracy and availability
Accuracy on the velocity measured: up to ±0.5%
Repeatability: up to 0.1%
Linearity: up to 0.1%
Accuracy on the level acquisition: up to 0.1%
Accuracy in the description of the section: up to 0.25%
Typical accuracy on the flow calculation: from 1 to 5% depending on the application and the
number of chords
1.7 Dimensions and weight
Weight: 7 kg (cabinet only)

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1.8 Supply
a UF 831 box
the connectors
the Y-cables for the probes
1.9 Protection against dust and immersion
IP 67: Total protection against dust; protection against immersion (30 minutes under 1m of water). This
protection is only valid if the installation was carried out or audited by Ultraflux.
This protection is only ensured when the connectors are connected or plugged (if not in use).
Important: If the flow meter is equipped with an optional communication module (Ethernet for example),
the protection index becomes IP20.
1.10 Power supply
There are two power supply ranges for the flow meter:
110 to 240 VAC (50 - 60 Hz)
9 to 36 VDC
The power of the flow meter is less than 40 W. A fuse-type internal protection protects the equipment. If
this protection is triggered, the equipment must be returned to Ultraflux, otherwise the guarantee will no
longer be valid.
The ground must be connected to both the power connector and to the ground connection contact, located
alongside the connectors. For the ground connection, it is recommended to use a copper braid.
When choosing the braid, it is important to respect the following rule:
Length / Width < 3
Bar
Braid
Green / yellow wire

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NT UF 831 CO GB (b) / March 2014
The cabinet power supply can be provided using an H05-RNF-3G0.75 type cable.
It is recommended to install a disconnectable bipolar circuit breaker interrupter with visible cut-off of 10 A
upstream of the flow meter power supply. It is also recommended to install lightning arresters on each of
the inputs/outputs of the flow meter, along with a galvanic isolator.
Important:
The wiring and unwiring of the flow meter must be performed by a person with electrical
accreditation. This accreditation must be obtained before dismounting the plate including the keypad
and the display. It is essential for this plate to be closed with a tool after each intervention.
Connection and disconnection from the outlets must be carried out with the power off and the
equipment isolated.
Ultraflux accepts no responsibility for incidents which may occur following a failure to respect these
instructions.
Comments:
Check the marking on the cabinet to ensure its supply voltage.
The flow meter is intended for an overvoltage category II installation.
1.11 Environment for use of the cabinet
Cabinet: –25°C to 50°C
Hygrometry: 80% maximum
Ventilation: no specific precautions.
Warning: This flow meter is a class A device. In a residential environment, it may cause radio-frequency
interference. In this case, the user may be asked to take appropriate measures.
1.12 Cleaning the flow meter
Use a dry cloth to clean the screen and the keypad.
The box may be cleaned with water, diluted alcohol or detergent using a sponge or a soft cloth. Do not use
abrasive materials or solvents.
1.13 Composition of a measuring point
Apart from the electronic converter (the cabinet), a measuring point includes the following elements:
1 to 8 pairs of probes
1 to 16 special cables for the probes (provided by Ultraflux)
1 to 4 level measurements per channel (which may or may not be provided by Ultraflux)

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CHAPTER 2: SAFETY INSTRUCTIONS