Endress+Hauser Promag 31 Bedienungsanleitung

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

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

Endress+Hauser 5

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

•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

6Endress+Hauser

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

Endress+Hauser 7

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

8Endress+Hauser

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

Endress+Hauser 9

1. System Description Promag 31

10 Endress+Hauser

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