Industrial Scientific OLDHAM 300 Series, Operating And Maintenance Manual

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19
Next, inject the calibration gas at a flow rate of 30 l/h (See Annex 2).
Wait for the signal to stabilize and adjust the signal with the sensitivity potentiometer (Ref. 2, Fig.
19).
The output signal should be:
EXAMPLE:
Sensor measure (% of full
range)
Output signal (mV)
0 880
50 2640
100 4400
Stop injecting the calibration gas and verify that the reading returns to zero (880 mV). If it does not,
repeat the procedure.
CALIBRATION COMPLETE
Flip the switch (Ref. 1, Fig. 17) into the “MES” position.
1.6. CTX300 CO
2
calibration
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)
Fig. 20
(P 5)
Ref. 1
Ref. 2
V
Fig. 19
Ref. 3
U = 880 mV + 3520 mV
Sensor measurement range
S3
S2
S1
1
2
3
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