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

2 Endress+Hauser

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

Endress+Hauser 3

Promag 31

4 Endress+Hauser

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

Endress+Hauser 5

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

•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

6 Endress+Hauser

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

Endress+Hauser 7

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

8 Endress+Hauser

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

Endress+Hauser 9

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

10 Endress+Hauser

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