User's Guide

POLI User’s Guide

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.

Note: Make sure pressure

in the calibration gas

cylinder is higher than 100

psi when using a T

calibration tube. (Pump

version only)