The analogue output options available are:
4.2.1 4-20mA Current Source
The Input Module sources current
proportional to the detected gas level.
i.e. zero gas = 4mA
full scale = 20mA
The supply is taken from the internal PSU.
Notes
Switch ON J3 and J4
4.2.2 4-20mA Current Sink
The Input Module can also sink current
proportional to the detected gas level.
i.e. zero gas = 4mA
full scale = 20mA
The supply is derived from the external
equipment.
Notes
Switch ON J2 and J5
4.2.3 1-5V Voltage Output
The SCM1 can provide a voltage output.
i.e. zero gas = 1V
full scale = 5V
This output is not ideal when transmitting a
signal over a large distance. The resistance
of a cable attached will cause a voltage
drop to occur.
Notes
Switch ON J1, J3 and J4.
NOTE: Incorrect jumper switch
configuration can cause damage to the
system.
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