Endress+Hauser promag 31 User manual

promag 31
Electromagnetic
Flow Measuring System
BA 028D/06/e/02.97
No. 50084257
valid from software version
V3.01.XX (measuring amplifier)
Cold Water Fiscal Metering
Operating Manual

Safety Instructions
Correct Usage
•The Promag 31 is only to be used for measuring the flow of conductive fluids.
•The Promag 31 flowmeter is designed and checked according to the regulations in
force EN 61010 “Protection Measures for Electronic Measuring Equipment”). The
flowmeter may be dangerous if it is not used for the purpose it was designed for or
is used incorrectly.
Please carefully note the information provided in this
Operating Manual indicated by the pictograms:
•The manufacturer assumes no liability for damage caused by incorrect use of the
instrument. Modifications and changes to the instrument may not be carried out.
Personnel for Installation, Start-up and Operation
•Mounting, electrical installation, start-up and maintenance of the instrument may
only be carried out by trained personnel authorized by the operator of the facility.
Personnel must absolutely and without fail read and understand this Operating
Manual before carrying out its instructions.
•The instrument may only be operated by personnel who are authorized and trained
by the operator of the facility. All instructions in this Manual are to be observed
without fail.
•With special fluids incl. those used for cleaning, E+H will be pleased to supply
information concerning the chemical resistance properties of wetted parts.
•The installer has to make sure that the measuring system is correctly wired
according to the wiring diagrams. The measuring system is to be grounded.
•Please observe all provisions valid for your country and pertaining to the opening
and repairing of electrical devices.
Repairs, Dangerous Chemicals
The following procedures must be carried out before a Promag 31 flowmeter is sent to
Endress+Hauser for repair:
•A note must always be enclosed with the instrument, containing a description of
the fault, the application, and the chemical and physical properties of the product
being measured.
•Remove all residue which may be present. Pay special attention to the gasket
grooves and crevices where fluid may be present. This is especially important if the
fluid is dangerous to health, e.g. corrosive, poisonous, carcinogenic, radioactive,
etc.
•No instrument should be returned to us without all dangerous material being
removed first, e.g. in scratches or diffused through plastic.
Incomplete cleaning fo the instrument may result in waste disposal or cause harm to
personnel (burns, etc.). Any costs arising from this will be charged to the owner of the
instrument.
Technical Improvements
The manufacturer reserves the right to modify technical data without prior notice.
Your local E+H Sales Office will supply you with all current information and any
updates to this Operating Manual.
Warning!
Safety Instructions Promag 31
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ContentsContents
Safety Instructions . . . . . . . . . 2
1. System Description . . . . . . . 5
1.1 Fields of application . . . . . . . . . 5
1.2 Principle of measurement . . . . . . . 5
1.3 The Promag 31 measuring system . . . 6
1.4 Design of the measuring system . . . . 8
2. Mounting and Installation . . . 11
2.1 General Information . . . . . . . . 11
2.2 Transport instructions for Promag
from DN 350 / 14" . . . . . . . . . 12
2.3 Mounting Instructions . . . . . . . 13
2.4 Mounting Promag 31 F . . . . . . . 16
2.5 Turning the transmitter housing
and local display
(compact version) . . . . . . . . . 18
2.6 Mounting the transmitter
(remote-mounted version) . . . . . . 19
2.7 Potential equalisation . . . . . . . 20
2.8 Earthing in an area with severe
interference . . . . . . . . . . . 21
3. Electrical Connection . . . . . 23
3.1 General information . . . . . . . . 23
3.2 Connection to the transmitter . . . . 23
3.3 Connection of the remote version . . . 24
3.4 Wiring diagrams . . . . . . . . . 25
3.5 Cable specifications . . . . . . . . 27
4. Operation and Commissioning . 29
4.1 Instrument Functions . . . . . . . . 29
4.2 Setting unit parameters with miniature
switches . . . . . . . . . . . . 33
4.3 Local display . . . . . . . . . . . 36
4.4 Commissioning . . . . . . . . . . 38
5. Fault Location and Remedies . . 39
5.1 Behaviour of the measuring equipment
in the event of a fault or alarm . . . . . 39
5.2 Instructions for fault location and remedies 40
5.3 Replacing the transmitter electronics . . 41
5.4 Repairs . . . . . . . . . . . . . . 43
6. Technical Data . . . . . . . . 45
6.1 Dimensions and weights . . . . . . . 45
6.2 Technical data: Sensor . . . . . . . . 48
6.3 Technical data: Transmitter and
measuring system . . . . . . . . . 52
6.4 Nominal diameter and flow rate . . . . 53
6.5 Conceptual definitions . . . . . . . . 54
6.6 Error limits . . . . . . . . . . . . 55
Index . . . . . . . . . . . . . 57
Documentation for Ex instruments
Instruments which are used in the explosion hazardous area are supplied with a
separate “Ex documentation”, which is an integral part of this Operating Manual.
The instructions and connected loads provided in this supplement must absolutely
be observed.
An appropriate icon is shown on the front of this document according to the
approval given and the test centre.
Promag 31 Contents
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Promag 31
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1. System Description
1.1 Fields of application
The measuring system Promag 31 possesses the PTB licence for the transport of cold
water (waste water) and at an attractive price offers accurate magnetic-inductive flow
measurement of fresh water with a minimum conductivity of 5 µS/cm. The measuring
system operates within a temperature range of 0 to 30 degrees celsius and can be
deployed for the following uses in the supply of drinking water:
Local water network Internal monitoring of delivery pipe network
Junctions Calculation of the bill from the main supply pipe
Tank inlet points
(incl. pump stations) Monitoring of the water source. For example, the amount of ground water.
Tank outlet points Certification for the amount supplied to the
delivery network
Overland supply pipe of a water
network Monitoring of the withdrawal and supply of different water works in a supply pipe
1.2 Principle of measurement
In accordance with Faraday’s law of induction, a voltage is induced in a conductor
that is moved through a magnetic field. In the magneto-inductive principle of
measurement the flowing medium represents the moving conductor. The induced
voltage is proportional to the flow velocity and is fed to the measuring amplifier by a
pair of electrodes. Across the cross-section of the pipe the flow volume is calculated.
The DC magnetic field is generated by a switched direct current of alternating
polarity. Together with the patented “Integrated Autozero Circuit” this assures a stable
zero point and makes the measurement independent of the medium and insensitive to
entrained solid particles. In our works every unit is calibrated on modern calibrating fa-
cilities, referable to international standards. There is no need for it to be adapted to
suit changing media.
ba028y01
Ue=B
⋅L ⋅v
Q=v
⋅A
Ue= induced voltage
B = magnetic induction
L = distance between electrodes
v = flow velocity
Q = volume flow
A = pipe cross-section
Fig. 1
Promag 31 1. System Description
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1.3 The Promag 31 measuring system
The promag measuring system is a fully modular, both mechanically and electrically.
The equipment can be extended by exchanging electronic boards. Thus the measur-
ing point can be optimally equipped and updated. The illustration below gives an
overview of the complete Promag 31 system.
Caution!
The Promag 31 is available with different Ex-certificates. Information about the current
status can be found from your existing E+H representive.
Furthermore, all relevant Ex informations and the specifications of the certificates
can always be obtained from your E+H representative.
Sensor Equipment of transmitter
Promag F
DN 15...300
Promag F
DN 350...2000
•Power pack board
85...260 V AC
or
•Power pack board
20...55 V AC,
16...62 V DC
•Amplifier board with
Pulse output
Current output
Status output
Auxiliary input
•Local display
ba028y02
Fig. 2
1. System Description Promag 31
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The measuring equipment comprises:
•Transmitter Promag 31 and
•Sensor Promag F
Remote-mounted version (FS version or FL version)
The transmitter is mounted remote from the sensor:
FS version
•Up to 10 m distance meduim conductivity
min. 5 µS/cm
•From 10…200 m distance max. cable length in terms
of the medium conductivity
(5...200 µS/cm)
FL version
•Max. cable length 200 m, not dependent on
conductivity.
•No EPD available.
•The electrical connection between transmitter and
sensor is made in the connection housing
Compact version:
The Promag 31 transmitter
and the sensor together form
a mechanical unit.
Promag F
Promag 31Promag 31 F
ba028y03
Fig. 3
Promag 31 1. System Description
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1.4 Design of the measuring system
Special points in the non fiscal use
•After the official calibration inspection of the measuring system, the clutch of the
leaded screw (Electronics compartment, Diagram) is sealed. Operation of this
measurement system with these DIP switches (page 33) or above the displays keys
(page 36) is not possible afterwards.
•After every application of the power supply, also with the first service inspection,
“Error” flashes on the display, as an indication of voltage drop. The system remains
in normal measurement mode and the status output is not activated. The same
applies to failure mode, that happens sporadically whilst in service. The flashing dis-
play section is deleted by activating the auxiliary input.
•The system totalises bidirectionaly, during which the pulse and current output
remains unidirectional.
•In fiscal use the periodical electrode cleaning is not possible.
•The auxiliary input, in contrast to “normal” use, is configured to suspend for the
second stage of interuption on the display like for the trigger of the display tests.
A measuremement calculation under pressure or the interuption of the totalisers is
not possible through the auxiliary inputs.
•Status output and auxiliary input must be wired by the user of the system.
Cable entry
Measuring
electrodes
Reference electrode
Screw cover of electronic
compartment (6 parameters can
be set here with internal miniature
switches)
Option: local display
Empty pipe
detection electrode
Outputs*
Current output active
galvanically separated
0/4...20 mA
RL ≤700 Ω
Pulse output Open Collector, passive
galvanically separated
0...400 Hz
Status output Open Collector, passive
galvanically separated
configurable for:
•output of system or process errors
•detection of the direction of flow (not available with fiscal metering
measurement system)
Auxiliary input The auxiliary voltage to be applied
to activate the function is in the region of 3...30 V DC
•External reset in case of error. (Reset-button must be supplied by the end
customer)
•Self test function through the displays has a 10 second duration
* Technical data: see Chapter 6
Sensor
Screw cover
Terminal compartment
Power supply*
85...260 V AC 45...65 Hz
20... 55 V AC
16... 62 V DC
ba028y04
Fig. 4
1. System Description Promag 31
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Operation
Inside the housing of the transmitter there are miniature switches with which
altogether six operating parameters can be set (see Chapter 4):
•Current range 0/4...20 mA
•Full-scale value scaling (volume/time), 8 steps
•Pulse weighting in decadic steps (volume), 8 steps
•Engineering units
•Function of the status output
Output of system/process errors
Flow direction recognition
•Creep suppression (on/off)
Local display
Using the Promag 31 local display, important parameters can be read off and control-
led at the measuring point directly:
•Flow rate and/or totaliser value
•Technical units (SI/US units)
(US-conformity with fiscal measuring systems is not available)
•Process variables (e.g. creep rate, partial pipe filling)
•Error messages
Using the three operating keys, it is also possible to select and activate various
functions. A small pin is used to press the keys down (keep pressed for
approx. 0.5...0.8 s).
•After the unit has been certified for fiscal metering, it is sealed and it is not possible
to self programe the unit.
Dynamic response
The Promag 31 measuring amplifier has a very high dynamic response of over
1000:1. It measures at medium velocities from less than 10 mm/s to over 10 m/s with
the specified accuracy. When the flow is pulsating, the amplifier is not over-driven
even above the end value setting at maximum speeds up to 12.5 m/s. There is then
no falsification of the measured value, provided the outputs are not over-driven.
Fiscal acceptance
Note!
Fiscal, magnetic-inductive flow meters may (in contrast to mechanical meters) be
operated with Q100 = Qmax.
Warning!
Only a custody transfer certified flowmeter can be used for cold water fiscal metering.
Fiscal-capability
Note!
Fiscal-capable flowmeters for custody transfers are not approved of by the standards
authority. These meters are however technically identical to fiscal flowmeters.
These meters may not be used in fiscal-bound custody transfers.
The fiscale-capable flowmeter can however can be examined and approved of by an
official standards authority through discussion at a later point in time.
Mass-measuring systems with a maximum flow of >2000 m3/h are exempted from
fiscal-standards. These measuring systems will not be fiscal, but they could be
fiscal-capable.
Promag 31 1. System Description
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Memory (DAT)
DAT is an exchangeable memory module. Stored in it are all characteristic data of the
sensor, such as calibrated quantities, nominal diameter, sensing rate, version, serial
number. When the transmitter has been changed, the previous DAT memory is in-
serted in the new transmitter. When the measuring system is started, the measuring
point continues to operate with the data stored in the DAT memory. Thus the DAT
concept assures maximum safety and optimum ease of operation when components
of the equipment are exchanged.
After calibration
The user of a fiscal Promag 31 measuring system is obligated to insure that the
perscribed standards have been adhered to.
Safety
•A comprehensive self-monitoring facility of the measuring system assures high
safety. Any system error messages (coil-current error, amplifier error, DAT error,
EEPROM error, ROM error, RAM error) or a power supply failure that do occur are
emitted at the configured status output.
•In the event of a power supply failure all data of the measuring system are securely
stored in the EEPROM (without a backup battery).
•The Promag 30 measuring system fulfils the safety requirements according to
EN 61010 “Protection Measures for Electronic Equipment for Measurement,
Control, Regulation and Laboratory Procedures”, and the general requirements
for electromagnetic compatibility (EMC) according to EN 50081 Part 1 and 2 /
EN 50082 Part 1 and 2 as well as the NAMUR recommendations.
•IP 67 protection (EN 60529) is standard for the transmitter and sensor (remote or
compact version). The sensor is also optionally available in IP 68.
1. System Description Promag 31
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