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
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
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
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

2. Mounting and Installation
Caution!
Pay consistent attention to the notes in this chapter regarding
•Type of protection
•Temperature ranges
•Mounting
to assure reliable measurement.
2.1 General hints
Type of protection IP 67 (EN 60529)
The equipment fulfils all requirements of IP 67. In order to assure the type of protec-
tion IP 67 after installation in the field or servicing, it is essential to comply with the
following points:
•The housing gaskets must be clean
and undamaged when inserted in
the sealing groove. If necessary, the
gaskets must first be dried, cleaned
or renewed.
•All screws in the housing and the
screw cover must be screwed up
tight.
•The cables used for connection must
possess the stipulated outside
diameter (see chapter 6.3).
•Tighten the cable entry (Fig. 6).
•Loop the cable before inserting. This
prevents moisture from penetrating
the cable entry (Fig. 6).
•Any cable entries not used must be
stopped with a screw plug.
•The protective grommet must not be
removed from the cable entry.
Caution!
The screws of the Promag sensor hous-
ing must not be released, otherwise
the guarantee for the type of protection
expires.
Note!
The sensors Promag A and F can optionally be supplied with the type of protection
IP 68 (permanently under water to a depth of 3 m). In this case the transmitter (IP 67)
has to be mounted remote from the sensor.
Temperature ranges
The maximum permissible ambient and medium temperatures must be adhered to
(see chapter 6 “Technical Data“).
When installed outdoors, specially in countries with high ambient temperatures,
a weatherproof hood should be provided as protection against direct solar radiation.
Fig. 6
Promag 31 2. Mounting and Installation
Endress+Hauser 11

2.2 Transport instructions for Promag from > DN 350 / 14"
Transportation to the installation point
The pipe coating on the flanges is protected from damage by protective disks during
transportation to the installation point. These are to be removed before installation.
The instruments are to be transported in the containers in which they are delivered.
The eyelets on the flange should be
used for lifting out and mounting the
sensor in the piping!
The sensor should not be lifted by the
connection housing!
The sensor should not be lifted by the
sheet casing using a forklift truck!
This can buckle the casing and dam-
age the internal magnetic coils.
Fig. 7
Fig. 8
Fig. 9
2. Mounting and Installation Promag 31
12 Endress+Hauser

Base of the sensor
The sensor should stand on a base
which is sufficiently strong to withstand
its weight.
Note!
The sensor must not be supported by
the sheet casing!
This can buckle the casing and dam-
age the internal magnetic coils.
>10 m
Fig. 10
Fig. 11
Promag 31 2. Mounting and Installation
Endress+Hauser 13

2.3 Hints for mounting
Please pay attention to the following hints, in order that you may measure correctly
and avoid damage to the equipment.
Electrode axis
The plane in which the electrode axis lies
with regard to the Promag 31 measuring
transmitter is identical for the measuring
sensors A and F.
Mounting position (any)
•Vertical mounting:
Optimal, with the flow upwards.
Entrained solid particles sink and
lighter fatty elements in the stationary
medium rise away from the electrodes.
•Horizontal mounting:
The axis of the electrodes must be
horizontal, thus preventing brief insula-
tion of the electrodes by entrained air
bubbles.
Vibration
Fasten the piping before and after the
sensor.
Caution!
Excessive vibration necessitates
separate mounting of the sensor and
transmitter (see chapter 2.6).
With free runs of piping over 10 m long,
we recommend mechanical supports.
Measuring electrodes
Electrode
axis
Fig. 12
Fig. 13
> 10 m
Fig. 14
2. Mounting and Installation Promag 31
14 Endress+Hauser

Inlet and outlet runs
The sensor should be mounted
away from fittings liable to generate
turbulence (e.g. valves, elbows,
T-junctions).
Inlet run: > 3...5 x DN
Outlet run: > 2 x DN
Mounting location
Correct measurement is only possible
when the pipe is full.
Consequently the following locations
should be avoided:
•Installation at the highest point
(air accumulation).
•Installation immediately before an
open pipe outlet in a downward line.
The alternative suggestion, however,
permits such a location.
Promag 31 should preferably be
installed in the cooler backflow for heat
measurement, respectively in the
foreflow for refrigerated measurement.
Promag 31 should be placed between 2
blockage and control units
(see installation scheme on page 5).
Partly filled pipes
For inclines a mounting similar to a
drain should be adopted.
Do not mount at the lowest point
(risk of solids collecting).
Note!
Here, too, the inlet and outlet lengths
should be maintained.
DN = pipe diameter
Fig. 15
Fig. 16
> 3...5 x DN
> 2 x DN
Fig. 17
Promag 31 2. Mounting and Installation
Endress+Hauser 15

Downward pipe (> 5 m)
With the suggested installation opposite
no partial vacuum is created (siphon,
vent valve after the sensor).
Installation of pumps
If possible avoid mounting the sensor
on the suction side of the pump (danger
of vacuum!). Information on the resist-
ance to vacuum of the measuring pipe
lining can be found in section 6.2.
Adaptor pieces
The sensor can also be mounted in a
pipe with a larger nominal diameter
when suitable adaptors (reducers and
expanders) to DIN 28545 are fitted.
The resultant increase in the rate of flow
increases the accuracy of measurement
with slowly flowing fluids.
The adjacent nomogram can be used
to determine the pressure loss caused.
Procedure:
1. Determine the ratio of the diameters
d/D.
2. From the nomogram read off the
pressure loss at the flow velocity and
d/D ratio.
Note!
The nomogram applies to fluids with a
viscosity similar to that of water.
Vent valve
Fig. 18
Fig. 19
Diameter ratio d/D
Pressure loss in mbar
Fig. 20
2. Mounting and Installation Promag 31
16 Endress+Hauser

2.4 Mounting the sensor
Mounting Promag 31 A
Length and dimensions
See chapter 6.1 “Dimensions and weights”.
Mounting
The inserted parts are
•screwed on to the 1" stub with a skirted nut.
•screwed on to the 1" stub direct
•mounted instead of the 1" threaded stub.
Screw tightening torques and gaskets
When screwing on the inserted parts the O-ring or the flat gasket is pressed
completely into the sealing groove of the stub. The skirted nut thereby experiences a
fixed stop.
Internal thread, external thread,
PVC adhesive coupling, hose con-
nection, welded nipples are screwed
on with a skirted nut.
Sensor 1" threaded stub
(ISO 228)
(not required with flange joints)
O-ring of Viton or
Kalrez or silicone flat
gasket (aseptic)
version
Tri-clamp connection is scre-
wed on directly
(incl.mounting clamps).
Flange joints (stainless
steel, 1.4571/316L,
PVDF) are fitted instead
of the welded stub.
Nominal diameters: DN 2...25
Fig. 21
Promag 31 2. Mounting and Installation
Endress+Hauser 17

Mounting Promag 31 F
Lengths and dimensions
See chapter 6.1 “Dimensions and weights”
Mounting
The sensor is mounted between the flanges of the pipe (Fig. 22). Since the lining of
the measuring pipe is drawn on over the sensor flange, it performs the sealing func-
tion at the same time.
Caution!
The Teflon (PTFE)-lined measuring pipe of the Promag F is fitted with protective discs
to guard the liner which is turned over the flanges. These discs may only be removed
just before mounting the sensor, thereby making sure that the liner is not damaged at
the flange or removed (during storage these discs must remain in position).
Screw tightening torques
•The listed tightening torques apply
to greased threads.
•Screws tightened up too tightly
deform the sealing surface.
Gaskets
•With Teflon (PTFE) linings a flange
gasket is dispensable.
•With soft rubber linings the mating
flange should have a thin film of
sealing grease applied.
•Use a gasket according to DIN 2690.
Caution!
Do not use sealing media that is electrically conductive (e.g. graphite). On the inside
of the measuring pipe this could result in an electrically conductive layer forming
which would short-circuit the measuring signal.
Fig. 22
DN
[mm] PN [mm] Screws Max. tightening
torque [Nm]
Hard
rubber
Teflon
(PTFE)
25
32
40
50
40
4 x M 12
4 x M 16
4 x M 16
4 x M 16
25
40
50
64
33
53
67
84
65
80
100
125
150
200
16
4 x M 16
8 x M 16
8 x M 16
8 x M 16
8 x M 20
8 x M 20
87
53
65
80
110
108
114
70
85
103
140
137
250
300
10 12 x M 20
12 x M 20
104
119
139
159
350
400
450
500
600
700
800
900
1000
10/16
16 x M 20
16 x M 24
20 x M 24
20 x M 24
20 x M 27
24 x M 27
24 x M 30
28 x M 30
28 x M 33
141/193
191/245
170/251
197/347
261/529
312/355
417/471
399/451
513/644
188/258
255/326
227/335
262/463
348/706
-
-
-
-
2. Mounting and Installation Promag 31
18 Endress+Hauser

Replacement measuring electrodes
Assembling the electrode:
1. Slide the new electrode (e) through the holding
cylinder (g) from below.
Gaskets at the tip of the electrode must be in
place and clean.
2. Connect the rotary arm (b) and electrodes
together using the pins (h). Ensure that the small
coil spring is in place.
3. Pull back the electrode as far as possible so that
the tip does not protrude out from the holding
cylinder (g).
4. Screw the holding cylinder onto the shut-off unit
(I) and tighten by hand.
Note!
Gasket (j) on the holding cylinder
must be in place and clean.
5. Open the shut-off value (f) and screw in the
electrode using the rotary arm (b). Pull the
electrode on by hand.
6. Screw the knurled nut (d) onto the holding
cylinder in order to clamp the electrode tight.
7. Secure the electrode cable (c) to the rotary arm
using the Allen screw.
Caution!
Ensure that the Allen screw of the
electrode cable is tight. A close
electrical contact cannot otherwise
be guaranteed and this can lead to
measurement errors.
Dismantling the electrode:
1. Loosen the Allen screws (a) of the cap/cover.
2. Unscrew the electrode cable (c) attached to the
rotary arm (b).
3. Undo the knurled nut (d) by hand. This nut is
used as a counter nut.
4. Remove the electrode (e) using the rotary arm
(b). This can now be taken out from the holder (g)
as far as the stop allows.
Warning!
The electrode can spring back to the
stop. Keep pressing against it
while loosening.
5. Close the shut-off valve (f) after the electrode has
been taken out as far as the stop.
Warning!
Do not attempt to open the shut-off
valve. Keeping it shut prevents
medium from escaping.
6. Unscrew the entire electrode along with the
holding cylinder (g).
7. Remove the pins (h) below the rotary arm.
8. Replace electrode with a new one.
A set of new electrodes can be ordered from E+H.
•left side:
Type DN 1350...2000
•right side:
Type DN 350...1200
cb
d
g
a
j
e
a
h
f
i
The Promag F Type DN 350...DN 2000 is available with replacement electrodes.
This version enables the measuring electrodes to be cleaned or replaced under process conditions.
Replacing an electrodes is carried out as follows:
Fig.23
Promag 31 2. Mounting and Installation
Endress+Hauser 19

2.5 Turning the transmitter housing (compact version)
In the compact version the transmitter housing can be rotated in steps of 90° relative
to the sensor. This enables the unit to be adapted to suit the various mounting
positions in the pipe.
Procedure:
1. Loosen the two fixing screws of the
transmitter bayonet catch (appr. 2
turns).
2. Turn the bayonet catch of the trans-
mitter as far as the screw slits.
3. Lift the transmitter housing to the
stop.
Note!
During servicing (and only then) the
transmitter housing can be separated
from the sensor. To do this the corre-
sponding marking notches on the
side of the bayonet flanges should
be brought into alignment. Do not
damage the cable to the sensor
when lifting the transmitter housing.
4. Turn the transmitter housing into the
desired position. Engage the bayonet
catch and re-tighten the two screws.
Turning the local display
1. Warning! Danger from electric shock.
Switch off the power supply.
2. Loosen the safety grip of the cover of
the electronics area. Loosen the
screw with a 3 mm Allen key.
3. Unscrew the cover of the electronics
area of the transmitter housing.
4. Unscrew the two Phillips screws
which fasten the display module.
5. Rotate the display module to the
required position.
6. Securely tighten the Phillips screws.
7. Replace and screw down securely
the cover of the electronics area of
the transmitter housing.
8. Replace and tighten the safety grip.
Fig. 24
Fig.25
2. Mounting and Installation Promag 31
20 Endress+Hauser