External Calibration

Principle:

Same calibration as XXX931 but outside the analyser.

The permeation tube, swept by a constant stream of pure gas (constant output which can be modified thanks to the pressure regulator), is installed in an oven regulated in temperature outside the analyzer and delivers a constant concentration of standard.

This feature allows validating all the analyses.

The gas of dilution used may be nitrogen or zero air (continuous output 50 ml / min and in dilution 300mL / min). In the sequence we program analyses and calibrations.

The electric gate of switching is included with a permeation tube (Benzene or DMS in standard).

A rotameter indicate the total dilution flow value used as working standard.

Example :

CALIB: Sample generated one permeation oven containing certified permeation tubes (e.g.: N-Butane, N-Hexane, Benzene, H2S, DMS…). One permeation tube is delivered in standard with the calibrator. Other permeation tubes are available upon request ; a maximum of 4 tubes may be placed in one permeation oven.

Ambient air: Sample from the analyzer (ambient air)