Measuring principleFollowing Faraday's law of magnetic induction, a voltage is induced in a conductor moving through a
magnetic field.
A0017035
UeInduced voltage
B Magnetic induction (magnetic field)
LElectrode spacing
ICurrent
vFlow velocity
In the electromagnetic measuring principle, the flowing medium is the moving conductor.
The voltage induced (U
) is proportional to the flow velocity (v) and is supplied to the amplifier by
e
means of two measuring electrodes. The flow volume (Q) is calculated via the pipe cross-section (A).
The DC magnetic field is created through a switched direct current of alternating polarity.
Formulae for calculation:
• Induced voltage Ue = B · L · v
• Volume flow Q = A · v
Measuring systemThe measuring system consists of a transmitter and a sensor.
Two versions are available:
• Compact version: Transmitter and sensor form a mechanical unit.
• Remote version: Sensor is mounted separate from the transmitter.
Terminal numbers and cable colors:
5/6=brown, 7/8=white, 4=green, 37/36=yellow
Note!
The measuring system must be included in the potential equalization.
Perfect measurement is only ensured when the fluid and the sensor have the same electrical potential.
This is ensured by the reference electrode integrated in the sensor as standard.
Endress+Hauser7
The following should also be taken into consideration for potential equalization:
• Internal grounding concepts in the company
• Operating conditions, such as the material/ grounding of the pipes (see table)
Standard situation
Operating conditionsPotential equalization
When using the measuring device in a:
• Metal, grounded pipe
Potential equalization takes place via the ground terminal
of the transmitter.
Note!
!
When installing in metal pipes, we recommend you connect
the ground terminal of the transmitter housing with the
piping.
Via the ground terminal of the transmitter
Special situations
Operating conditionsPotential equalization
Proline Promag 10L
A0010831
When using the measuring device in a:
• Metal pipe that is not grounded
This connection method also applies in situations where:
• Customary potential equalization cannot be ensured.
• Excessively high equalizing currents can be expected.
Both sensor flanges are connected to the pipe flange by
means of a ground cable (copper wire, at least 6 mm² /
0.0093 in²) and grounded. Connect the transmitter or
sensor connection housing, as applicable, to ground
potential by means of the ground terminal provided for the
purpose.
The ground cable is mounted directly on the conductive
flange coating with the flange screws.
Note!
!
The ground cable for flange-to-flange connections can be
ordered separately as an accessory from Endress+Hauser.
When using the measuring device in a:
• Plastic pipe
• Pipe with insulating lining
This connection method also applies in situations where:
• Customary potential equalization cannot be ensured.
• Excessively high equalizing currents can be expected.
Potential equalization takes place using additional ground
disks, which are connected to the ground terminal via a
ground cable (copper wire, at least 6 mm² / 0.0093 in²).
When installing the ground disks, please comply with the
enclosed Installation Instructions.
A0011567
Via the ground terminal of the transmitter and the
flanges of the pipe
A0010833
Via the ground terminal of the transmitter and the
optionally available ground disks
8Endress+Hauser
Proline Promag 10L
1
22
1
2
3
4
5
6
7
a
b
Operating conditionsPotential equalization
When using the measuring device in a:
• Pipe with a cathodic protection unit
The device is installed potential-free in the pipe.
Only the two flanges of the pipe are connected with a
ground cable (copper wire, at least 6 mm² / 0.0093 in²).
Here, the ground cable is mounted directly on the
conductive flange coating with flange screws.
Note the following when installing:
• The applicable regulations regarding potential-free
installation must be observed.
•There should be no electrically conductive connection
between the pipe and the device.
• The mounting material must withstand the applicable
torques.
Cable entryPower supply and electrode cables (inputs/ outputs):
• Cable entry M20 × 1.5 (8 to 12 mm / 0.31 to 0.47")
• Thread for cable entries, ½" NPT, G ½"
Connecting cable for remote version:
• Cable entry M20 × 1.5 (8 to 12 mm / 0.31 to 0.47")
Operation in zones of severe electrical interference
The measuring device complies with the general safety requirements in accordance with EN 61010
and the EMC requirements of IEC/EN 61326.
Note!
Grounding is by means of the ground terminals provided for the purpose inside the connection
housing. Ensure that the stripped and twisted lengths of cable shield to the ground terminal are as
short as possible.
Performance characteristics
Reference operating
conditions
Maximum measured error• Current output: also typically ± 5 μA
• Error limits following DIN EN 29104, future ISO 20456
• Water, typically +15 to +45°C (+59 to +113 °F); 0.5 to 7 bar (73 to 101 psi)
• Specification as per calibration protocol
• Data on the measured error based on accredited calibration rigs traced back to ISO 17025
Mounting locationEntrained air or gas bubble formation in the measuring tube can result in an increase in measuring
errors.
Avoid the following installation locations in the pipe:
• Highest point of a pipeline. Risk of air accumulating!
• Directly upstream from a free pipe outlet in a vertical pipeline.
!
A0003202
Mounting location
Installation of pumps
Sensors may not be installed on the pump suction side. This precaution is to avoid low pressure and the
consequent risk of damage to the lining of the measuring tube. Information on the pressure tightness
of the measuring tube lining → 17, Section "Pressure tightness".
Pulsation dampers may be needed when using piston pumps, piston diaphragm pumps or hose pumps.
Information on the shock and vibration resistance of the measuring system → 16, Section "Shock and
vibration resistance".
A0003203
Installation of pumps
Partially filled pipes
Partially filled pipes with gradients necessitate a drain-type configuration.
The empty pipe detection function (EPD) provides additional security in detecting empty or partially
filled pipes.
Note!
Risk of solids accumulating. Do not install the sensor at the lowest point in the drain. It is advisable to
install a cleaning valve.
Endress+Hauser11
Proline Promag 10L
³´5DN
³ 2
´ DN
h
2
1
A0003204
Installation with partially filled pipes
Down pipes
Install a siphon or a vent valve downstream of the sensor in down pipes h ≥ 5 m (16.4 ft). This
precaution is to avoid low pressure and the consequent risk of damage to the lining of the measuring
tube. This measure also prevents the liquid current stopping in the pipe which could cause air locks.
Information on the pressure tightness of the measuring tube lining → 17, Section "Pressure
tightness".
A0008157
Installation measures for vertical pipes
1Vent valve
2Pipe siphon
hLength of the down pipe
OrientationAn optimum orientation helps avoid gas and air accumulations and deposits in the measuring tube.
However, the measuring device also offers the additional function of empty pipe detection (EPD) for
detecting partially filled measuring tubes or if outgassing fluids or fluctuating operating pressures are
present.
Vertical orientation
This is the ideal orientation for self-emptying piping systems and for use in conjunction with empty
pipe detection.
A0008158
Vertical orientation
12Endress+Hauser
Proline Promag 10L
A
1
22
A
3
³ 5DNx
³ 2DNx
!
Horizontal orientation
The measuring electrode axis should be horizontal. This prevents brief insulation of the two measuring
electrodes by entrained air bubbles.
Note!
Empty pipe detection only works correctly with horizontal orientation if the transmitter housing is
facing upwards. Otherwise there is no guarantee that empty pipe detection will respond if the
measuring tube is only partially filled or empty.
A0003207
Horizontal orientation
1EPD electrode for empty pipe detection
2Measuring electrodes for signal detection
3Reference electrode for potential equalization
Inlet and outlet runIf possible, install the sensor well clear of assemblies such as valves, T-pieces, elbows etc.
Note the following inlet and outlet runs to comply with measuring accuracy specifications:
• Inlet run: ≥ 5 × DN
•Outlet run: ≥ 2 × DN
Inlet and outlet run
A0003210
Endress+Hauser13
Proline Promag 10L
100
10
0.5
d / D
[mbar]
0.60.7 0.80.9
1 m/s
2 m/s
3 m/s
4 m/s
5 m/s
6 m/s
7 m/s
8 m/s
1
D
d
max. 8°
AdaptersSuitable adapters to DIN EN 545 (double-flange reducers) can be used to install the sensor in larger-
diameter pipes. The resultant increase in the rate of flow improves measuring accuracy with very slowmoving fluids. The nomogram shown here can be used to calculate the pressure loss caused by reducers
and expanders.
!
Note!
The nomogram only applies to liquids of viscosity similar to water.
1.Calculate the ratio of the diameters d/D.
2.From the nomogram read off the pressure loss as a function of flow velocity (downstream from
the reduction) and the d/D ratio.
A0003213
Pressure loss due to adapters
14Endress+Hauser
Loading...
+ 30 hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.