Proline Promag 50D
Hauser
9
Power supply failure
• Lasting min. 1 cycle frequency:
• EEPROM saves measuring system data
• S-DAT: exchangeable data storage chip which stores the data of the sensor (nominal diameter, serial number,
calibration factor, zero point etc.)
Potential equalization
Perfect measurement can only be guaranteed if the fluid and sensor are on the same electric potential. This is
ensured by the two ground disks of the sensor.
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, cathodic protection etc. (see Table)
Operating conditions
Potential equalization
When using the measuring device in a:
• Metal, grounded pipe
• Plastic pipe
• Pipe with insulating lining
Potential equalization takes place via the ground terminal of the
transmitter (standard situation).
!
Note!
When installing in metal pipes, we recommend you connect the
ground terminal of the transmitter housing with the piping.
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Via the ground terminal of the transmitter
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
Potential equalization takes place via the ground terminal of the
transmitter and the two pipe flanges.
Here, the ground cable (copper wire, 6 mm²) is mounted directly
on the conductive flange coating with flange screws.
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Via the ground terminal of the transmitter and the
flanges of the pipe.
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, 6 mm²). 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.
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Potential equalization and cathodic protection
1
Power supply isolation transformer
2
Electrically isolated
6 mm² Cu
6 mm² Cu
1
2
2
