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XDT User’s Manual Appendices
51
-100°C to +20°C settings, because the 4-20mA provides sufficient resolution to measure the out-
put better than the specified accuracy of the sensor.
Relationship of 4-20mA output and instrument reading in ppmV or LBS
Instrument reading in ppmV
Instrument reading in LBS of H2O / million cubic feet
10 100 1000 10000
4.1mA
5mA
0.1 1 10 100 1000
12mA
8mA
20mA
4.5mA
4/20 mA output
0.56 LBS = -60˚C = 10.66 ppmV
1.97 LBS = -50˚C = 38.83 ppmV
49.3 LBS = -20˚C = 1019.3 ppmV
289.1 LBS = 0˚C = 6063.8 ppmV
Low AO range = -100
˚C High AO range = +20
˚C
Low AO
range = -65.5
˚C
High AO
range = -38.5
˚C