H4-EN Calibration P
AGE
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5
Analyze of the calibration results
During the calibration process, several parameters are measured for each analyser:
• Zero: voltage when ambient air (or ambient gas from the cylinder) is passing through
the analyzers
• Sensitivity: voltage variation in mV for 1% of gas concentration change
• Transit time: time (in ms) needed for the calibration gas to pass through the internal
circuit and reach the analyser. O
2
transport time is higher than CO
2
transport time
because O
2
analyser is located after CO
2
analyser in the circuit.
• Response time: time in (ms needed for the analyzers to respond when the calibration
gas pass through them. This time is calculated between 10 and 90% of the analyzer’s
response.
The traffic lights indicate the deviation of these parameters relative to the factory
(reference) adjustment.
The calibration is good and the system can be used.
The calibration is acceptable but a verification of the system is recommended.
The calibration is not acceptable. A verification of the system is required.
Zero (mV)
Sensitivity (mV/%)
Response time (ms)
Transport time (ms)
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