Endress+Hauser Proline Promag 53H - Electrical Connection, Remote Version; Potential Equalization

Proline Promag 50H, 53H
Endress+Hauser 11
Electrical connection, remote
version
A0011747
Connecting the remote version
a Wall-mount housing connection compartment
b Sensor connection housing cover
c Electrode cable
d Coil current cable
n.c. Not connected, insulated cable shields
Terminal no. and cable colors: 6/5 = brown; 7/8 = white; 4 = green; 36/37 = yellow, 41 = 1, 42 = 2
Potential equalization Perfect measurement is only ensured when the medium and the sensor have the same electrical
potential.
Metal process connections
Potential matching usually takes place via the metallic process connections in contact with medium
which are directly mounted on the measuring transmitter. This usually means that additional potential
matching measures are unnecessary.
Plastic process connections (DN 2 to 25)
If the process connections are made of a synthetic material, additional ground rings or process
connections with an integrated ground electrode must be used to ensure the potential between the
sensor and fluid is matched. No potential matching can affect the accuracy of the measurements or
cause the destruction of the sensor through the electrochemical decomposition of the electrodes.
When using ground rings, note the following points:
• Depending on the option ordered, plastic disks may be installed at the process connections instead
of ground rings. These plastic disks serve only as spacers and have no potential matching function.
In addition, they provide a sealing function at the sensor/process connection interface. For this
reason, with process connections without metal ground rings, these plastic disks/seals must not be
removed, or must always be installed.
• Ground rings can be ordered separately from Endress+Hauser as accessories.
When placing the order, make certain that the ground rings are compatible with the material used
for the electrodes. Otherwise, there is a risk that the electrodes may be destroyed by electrochemical
corrosion! You can find material data on   59.
• Ground rings, including the seals, are mounted within the process connections. Therefore, the fitting
length is not affected. You can find the dimensions of ground rings on   46.
E1
E2
GND
E
S1
E1
E2
S2
GND
E
S
5
7
4
37
42 41
42 41
6
5
7
8
4
37 36
n.c. n.c.
dc
c
d
a
b
n.c.
21