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Installation, operation and maintenance
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© 06 / 2021 METTLER TOLEDO Group, CH
4.2
Electrical connections
Caution! Some components inside the sensor are energized with voltages which can
cause lethal shocks in case of contact. The instrument needs to be switched to zero-po-
tential before any operation on the wiring terminal. Be careful during preparing of
operation, handling and operation of the sensor. This work is to be accomplished in
principle only by qualified technical personnel..
Cable connection to M800 Process 1-Channel transmitter
The RS 485 data cable (5-pin) is available from METTLER TOLEDO in various lenght. Connect the
data cable to the M800 Process 1-Channel transmitter as described below.
M800 Process 1-Channel
Terminal
1
2
3
4
5
6
7
8
In order to ensure optimum measurement results the following points must be considered:
– Run the connection cable through the cable gland.
– Connect the wires to the sensor.
– Hand-tighten the cable gland.
4.3
Operation
In case of any failure or malfunction, the equipment in which the sensor is installed, needs to be
in a safe condition (depressurized, empty, rinse, vent, etc.).
4.3.1 Process conditions
– The plant pressure should never exceed the specification of the delivered sensor.
– The process temperature should never exceed the specification of the delivered sensor.
Caution! Exceeding the specified maximum pressure and / or the specified maximum
temperature represent a very high safety risk. Please read the additional safety instructions
before installation.
– Avoid air and gas bubbles inside the sensor, they cause disturbances. Noise and drift of the
measurement would be the result (air bubbles are not expected at a pressures higher than
2 bar in aqueous solutions).
TB3
Function
1-Wire
GND 5 V
RS 485 B
RS 485 A
GND 5 V
5 V
24 V
GND 24 V
5-pin cable wire color
–
Yellow
Blue
White
Grey
–
Brown
Black
InPro 86X0 i e
30 421 372 D
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