Oldham ctx 300 - 4-20 mA analog output

20
CTX 300
User manual
Figure 16: CTX 300 CO
2
main circuit
board. This card does is not equipped
with a MES-CAL switch.
4-20 mA analog output
For CTX 300 sensors, except for the CO
2
sensor, the 4-20 mA output current is
proportional to the gas level.
Notes:
■ The CO
2
sensor can be equipped with a linearization board.
■ MX 15 and MX 32 control units that integrate with the linearization of the CO
2
sensor are available upon request.
■ The MX 62 integrates with the linearization of CO
2
sensors.
The various states of the 4-20 mA output are:
■  1 mA to indicate a fault.
■ = 2 mA in Calibration position, except for the CO
2
sensor that does not have a
calibration function.
■ Between 4 and 20 mA for measurement values.
■ ≥ 20 mA if levels exceed measurement range.