5 Functions
5-3. External output
FP-300AGZS
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5-3-2. External signal output (4 - 20 mA)
The gas monitor provides 4 - 20 mA output that corresponds to the gas concentration display on LCD.
The 4 - 20 mA output on FP-300AGZS has the following features.
The value is updated at the end of each detection cycle.
The value indicates an average gas concentration within a detection cycle.
The detection result (average value) from the previous detection cycle is output.
See the following chart that indicates the timing of 4 - 20 mA output for gas concentration varying with time.
5-3-3. External output operation
Output:
4 - 20 mA output
Load resistance: Below 300 Ω
4 mA ............ Gas concentration indication 0
20 mA ............ F.S.
22 mA ............ Gas concentration over F.S.
0.5 mA ............ During a time of trouble
2.5 mA ............ After initial power-on (until the gas monitor enters detection state)
During maintenance
Measurement cycle
Gas concentration variation
4 - 20 mA output
Elapsed time
