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6.4 Calibration via Modbus Communication
6.4.1 Operation of the Registers for Calibration
Sensor Days
of Operation
Max days to service
autoset to 0
Max days to service
autoset to 0
Execute zero
calibration
Execute zero
calibration
Execute span
calibration
Execute span
calibration
Sensor expired
Days since Service
Service Due
Zero Calibration
Span Calibration
Max Days to Service Max Days to Service Lifetime Sensor
Automatic at 0 when the
sensor is replaced
Place the sensor in clean air and wait for the
warm-up phase to be completed at the end of the
start-up phase. Enter the Technician password to
access the device (2222 to register 205).
Send 1 to ZeroCalibration (coil 407) to perform
the fresh air calibration. If coil 407 is read as 0
after calibration, it means that calibration was
successful.
Send the span gas concentration to the
SpanConcentration variable (holding register 655).
Supply gas to the sensor. Use the calibration kit
and a 0.5 l/min airflow regulator. Wait around 1
minute until the concentration is stable.
Send 1 to SpanCalibration (coil 408). Read as 0 to
confirm the calibration was successful.
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