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01115009A _9
Paracube
®
Micro – Instruction Manual
5.3
Zero Drift Offset Correction in the Host Equipment
To optimize measurement accuracy without employing the SPOC can be made in the
host unit’s software.
Apply a known concentration of oxygen, e.g. air (20.9% O
2
) to the sensor, and store in
the host system memory the difference between the sensor’s reported oxygen reading
and the known oxygen concentration. Subsequent oxygen readings may then be
corrected by removing this stored offset value.
5.4
LED sensor status
The dual colour LED located on upper circuit board provides a visible indication of the
calibration status or the sensor’s health.
1. Under normal operating conditions and with valid calibration data the LED
will emit a constant green light.
2. Following an unsuccessful SPOC, the LED will emit an amber light, flashing
at 2Hz and 20% duty cycle. This LED status will remain until a successful
SPOC is performed. During this period the sensor will use the previous valid
calibration/SPOC data to provide the sensor’s oxygen reading.
3. The sensor’s LED will flash amber at 20% duty cycle if the sensor has
completed its zero offset correction following a SPOC via the ‘Change to
physical orientation’ method, but is not subsequently returned to its normal
measurement orientation.
4. If after applying power to the sensor, it cannot initiate the micro-processor
the LED will emit a static red light indicating sensor failure.
