5. Installation
5.3 Electrical connection
Please connect all sensors before switch on the S 551. Flow / dew point
sensors are detected automatically when connected. The same
extension modules ( power meter, US flow meter, analog extension)
which are connected to terminal M.
Process signals can not be detected automatically. The user has to
select the appropriate sensor type from the sensor selection menu. For
details please refer to chapter 7.5.4 analog input setting.
Connection on the casing
Channel Sensor type / Description
1 + 2 Flow and dew point sensors
3 + 4 Process signals
M +M Modbus sensor modules
5 Ethernet port
6 Mains supply
10 S 551
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