Oldham ctx 300 - CTX 300 CO2 calibration

5 – Maintenance
29
CTX 300 CO
2
calibration
This is a Carbone dioxide type sensor.
■ Warning: the sensor should be turned on for 15 minutes before
adjustments are made. The following text describes the steps
necessary to adjust the transmitter (first calibration).
■ Adjustment: if the current loop of the output signal has an impedance of
500 ohms, the power supply should never fall below 23 V DC.
■ Inject nitrogen at a rate of 30 l/h.
■ On the X1 terminal board, place an
ammeter between terminals 1 (+) and
2 (-).
■ With the potentiometer Z, adjust the
current to 4 mA.
■ With the ammeter still connected,
inject the test gas at a rate of 60 l/h.
■ Adjust the sensitivity with the
potentiometer S. Refer to the
paragraph Calibration curves, on
page 30 for sensors without
linearization cards.
■ If this fails, flip the J2 jumper and
begin again.
Figure 33