Endress+Hauser promag 31 User manual

promag 31
Electromagnetic
Flow Measuring System
BA019D/06/e/10.96
Nr. 50074675
valid from software version
V2.01.XX (measuring amplifier)
Operating Manual
Hauser + Endress
Nothing beats know-how

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.
Safety Instructions Promag 31
2Endress+Hauser

Contents
Contents
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 Short description and design of the
measuring system . . . . . . . . . . . 7
2. Mounting and Installation . . . 11
2.1 General hints . . . . . . . . . . . . 11
2.2 Transport instructions for Promag
from > DN 350 / 14" . . . . . . . . . 12
2.3 Hints for mounting . . . . . . . . . . 14
2.4 Mounting the sensor . . . . . . . . . 17
2.5 Turning the transmitter housing
(compact version) . . . . . . . . . . 20
2.6 Mounting the transmitter
(remote-mounted version) . . . . . . . 21
2.7 Potential equalisation . . . . . . . . . 22
2.8 Earthing in an area with severe interference 23
3. Electrical Connection . . . . . 25
3.1 General information . . . . . . . . . 25
3.2 Connection to the transmitter . . . . . 25
3.3 Connection of the remote-mounted version 26
3.4 Wiring diagrams . . . . . . . . . . 27
3.5 Cable specifications . . . . . . . . . 29
4. Operation and Commissioning . 31
4.1 Functions of the equipment and works
settings . . . . . . . . . . . . . . 31
4.2 Setting unit parameters with miniature
switches . . . . . . . . . . . . . . 35
4.3 Local display Promag 31 . . . . . . . 40
4.4 Commissioning . . . . . . . . . . . 42
5. Fault Location and Remedies . . 43
5.1 Behaviour of the measuring equipment in the
event of a fault or alarm . . . . . . . . 43
5.2 Instructions for fault location and remedies 44
5.3 Replacing the transmitter electronics . . 45
5.4 Replacing the fuse . . . . . . . . . . 47
5.5 Repairs . . . . . . . . . . . . . . 47
6. Technical Data . . . . . . . . . 49
6.1 Dimensions and weights . . . . . . . 49
6.2 Technical data: Sensor . . . . . . . . 53
6.4 Nominal diameter and flow rate . . . . 59
6.5 Error limits . . . . . . . . . . . . 60
7. Approvals . . . . . . . . . . . 61
Index . . . . . . . . . . . . . . 62
Promag 31
Endress+Hauser 3

Promag 31
4Endress+Hauser

1. System Description
1.1 Fields of application
For the exact calculation of the energy used in heating and cooling circulations heat
counter do their work. Part of a heat counter is the hydraulic transmitter Promag 31.
It registers the flow volume of the heat, resp. refrigerating transfer medium.
The thermic energy used ist taken from this measuring value and the temperature
difference between backflow and inflow. Promag 31 can measure all heat or refrig-
erating media with a minimum conductivity of 5 µS/cm.
Major applications are:
•Calculation of heating costs in districts and buildings with central heating.
•Distributory stations of long distance energy nets.
•Definition of efficiency and supervision of energy transforming processes
•Control and regulation of refrigerators
1.2 Principle of measurement
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
Set up of measuring installation
➀Calculatory unit
➁Flow meter Promag 31
➂Inflow temperature feeler
➃Backflow temperature feeler
Auxiliary
power
➀
➁
➂
➃
Auxiliary
power
Fig. 1
Fig. 2
Promag 31 1. System Description
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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 measure-
ment 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 po-
larity. 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
facilities, referable to international standards. There is no need for it to be adapted to
suit changing media.
1.3 The Promag 31 measuring system
The Promag measuring system is 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 extended.
The illustration below gives an overview of the complete Promag 31 measuring
system.
•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 (option)
Sensor
Transmitter
Equipment of
transmitter
PromagA
Promag F
DN 25...300
Promag F
DN 350...1000
Fig. 3
1. System Description Promag 31
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1.4 Short description and design of the measuring system
Short description
The measuring equipment comprises:
•Transmitter Promag 31 and
•Sensor Promag A or F
Transmitter
Sensor
Promag 31 F
Promag A
Promag 31
Promag 31 A
Promag F
Promag 31
Remote-mounted version (FS or FL version):
The transmitter is mounted remote from the sensor:
FS version
•Up to 10 m distance Medium 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
(Exception: Promag A).
•The wall-mounting holder for the transmitter is supplied.
Compact version:
The Promag 31 transmitter
and the sensor together form
a mechanical unit.
Fig. 4
Promag 31 1. System Description
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Design of the measuring system (considering Promag 31 F as example)
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
controlled at the measuring point directly:
•Flow rate and/or totaliser value
•Technical units (SI/US units)
•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).
Power supply*
85...260 V AC 45...65 Hz
20... 55 V AC
16... 62 V DC
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
Auxiliary input The auxiliary voltage to be applied
to activate the function is in the
region of 3...30 V DC
•Measured value suppression
•Totalizer reset (with local display only)
* Technical data: see chapter 6
Cable entry
Sensor
Measuring
electrodes
Reference electrodes
Screw cover of electronic
compartment (6 parameters can
be set here with internal miniature
switches)
Screw cover
Terminal compartment Empty pipe
detection
electrode
Fig. 5
1. System Description Promag 31
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Turn down/Accuracy class
As a hydraulic transmitter appropriate for verification of thermic energy measurement
Promag 31 has been tested according to the international recommendation for heat
counters (OIML R72) and for warmwater countes and meets their technical require-
ments for measurements.
As a partial device of a heat counter it is approved for accuracy class 4, according to
OIML R75 (+/-3% hydraulic transmitter), at a turn down Qi: Qs= 1 : 100 (Qi~ Qmin;
Qs~ Qmax). This applies for a velocity of the medium between 100 mm/s and 10 m/s
at specified measuring accuracy.
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
inserted 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.
Safety
A comprehensive self-monitoring facility for the measuring system assures maximum
safety. Any error messages that do occur are emitted at the configured status output.
•Power supply failure
•Process error
•System error:
Coil-current error
Amplifier error
DAT error
EEPROM error
ROM error
RAM error
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 31 measuring system complies with the requirements for
electromagnetic compatibility (EMC) as per IEC 801/VDE 0843 and the NAMUR
recommendations.
IP 67 protection (EN 60529) is standard for the transmitter and sensor (remote or com-
pact version).
The sensor is also optionally available in IP 68.
Promag 31 1. System Description
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1. System Description Promag 31
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