Electrical connection Proline Promag W 800
36 Endress+Hauser
7.3 Connecting the external power supply (optional)
7.3.1 Preparing the connection
It is possible to power the measuring device directly via an external power supply.
In addition, batteries are to be used as a backup if the power supply fails and to operate the
GSM/GPRS module.
Possible combinations:
If the measuring device is powered via an external power supply, energy from the batteries is
not used. In such instances, the measuring device can work with maximum measured value
acquisition cycles (Prof./ MPROF parameter).
To ensure the device continues measuring if the external power supply fails, a battery is used as
the backup power supply at the B1 terminal → 38.
The external power supply only supports measuring operation. Additional batteries must be
inserted at the B3 terminal for communication via the GSM/GPRS modem → 38.
The batteries are not charged if an external power supply is used.
The current state of charge of the batteries can be read on the onsite display or in the
BATTS parameter.
7.3.2 Measuring device requirements
• Integrate the measuring system into the potential equalization system → 42.
• The power supply line must be equipped with an external protection for overload current
(fuse or automatic circuit breaker).
• The measuring device must have a suitably labeled and easy-to-reach ON/OFF switch.
7.3.3 Power supply and power supply unit requirements
• The power supply must be within the range indicated on the nameplate.
• Take the cable specification of the connecting cable into consideration.
• Take the connecting cable requirements into consideration.
Ordered feature
"Power supply"
Power
supply
Number of
batteries
5W8B**-***J*********
100 to 240 V AC
12 to 60 V DC
1 backup battery
5W8B**-***K*********
100 to 240 V AC
12 to 60 V DC
1 backup battery
3 batteries for GSM/GPRS module
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