POLI User’s Guide
26
This procedure determines the zero point of the sensor calibration curve for all the
sensors that require a zero calibration. The POLI should be zero calibrated in clean
ambient air with 20.9% oxygen or with a cylinder of clean zero air.
At the calibration menu, select ‘Fresh Air’ by pressing [+/OK] once to enter fresh air
calibration.
After a timer countdown, the zero calibration is done. The LCD displays the sensor
names and tells you whether each calibration passed or failed, followed by the sensor
readings.
Note: You can abort the calibration at any time during the countdown by pressing [ /↓].
6.2.3 Span Calibration
This procedure determines the second point of the sensor calibration curve for the sensor.
Note: When a manual calibration is performed, the readings shown are in the equivalent
units of the calibration gas, and not the measurement gas.
6.2.3.1 POLI Pump Version
The POLI pump draws at a flow rate of between 200cc/min and 450cc/min. The
instrument must be connected to a cylinder of calibration gas with supplied tubing
featuring a T calibration tube, as illustrated below.
Note: A constant-flow regulator with flow rates from 500cc/min to 1000cc/min should be
used
6.2.3.2 POLI Diffusion
The water-trap filter or inlet cover needs to be taken down first if it is a diffusion version.
A calibration adaptor with a 15cm hose is used for supplying calibration gas to the inlet at
the top of the instrument.
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