Figure 17: sensor calibration assembly.
Zero adjustment should be performed in a gas and vapor free area. If this is not
possible, synthetic bottled air can be injected at a rate of 60 l/h.
Use a bottle of test gas to adjust sensor sensitivity (concentration close to the alarm
threshold or corresponding to 30% of the measurement range at a minimum). The
recommended rate is 60 l/h.
Note: when dealing with dangerous gases, you MUST consult a specialized Oldham
technician or use another sensor pack recently pre-calibrated at a factory.
The detector should be calibrated using the intended flow-rate. The actual
concentration of gas may be underestimated if the detector was calibrated
with too high of a flow rate.
CTX 300 calibration
1
st
case: CTX 300 with display (excluding O
2
)
■ The sensor is operating: the green
light (ref. 1) is lit and the display
screen shows the measurement level.
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