Oldham ctx 300 - Page 23

5 – Maintenance
23
■ Flip the maintenance switch (ref. 1)
into the CAL (calibration) position: the
yellow light (Figure 18, ref. 2) will be
lit and the sensor will send a 2 mA
current to the control unit
(Maintenance mode).
■ Verify that the sensor is located in a
clean-air environment. If not, inject
synthetic air at a flow rate of 30 l/h.
Figure 19
■ Wait for the measurement to stabilize
(displayed on screen) and adjust the
zero by using the ZERO
potentiometer located on the sensor
pack (ref. 2).
■ Inject the recommended calibration
gas at a flow rate of 30 l/h.
■ Wait for the measurement to stabilize.
■ Adjust the sensitivity by using the
sensitivity potentiometer located on
the sensor pack (rep. 1).
Figure 20
■ Stop injecting the calibration gas.
■ Remove the gas injection pipe, then
wait and verify that the signal returns
to zero. Repeat procedure if it does
not.
■ Flip the maintenance switch (rep. 1)
into the MES (measure) position. The
yellow light will turn off (Figure 18,
rep. 2).
■ Calibration is complete.
Figure 21