PrimaX
GB
61
Gas flow rate: 1,0 l/min
8.3 Remote Calibration
Fig. 15 PrimaX with CalGard
The CalGard stainless steel remote calibration adaptor provides reliable operation
of remotely installed gas detectors working under harsh environmental conditions.
Additionally, the CalGard allows remote verification ("bump test") or instrument cal-
ibration of gases listed later in this section and oxygen via a hose connection in the
presence of wind speeds up to 6 m/s.
In normal measurement operation, the ambient air passes through the air vents into
the remote calibrator directly to the sensor (diffusion operation). During a bump test
or instrument calibration, the test gas is supplied to the sensor via the hose connec-
tion at the bottom of the CalGard. An integrated mechanism prevents the dilution
and dispersion of test gas otherwise caused by external influences, such as wind.
This allows a fast response from the sensor to the applied test gas.
Once calibration is complete, the air inlet reopens to allow the monitoring of ambient
air for gas without the need for further user intervention.
Installation
For correct operation, PrimaX and CalGard must be used in a vertical position
(hose connection pointing downwards). The CalGard remote calibration adaptor
can be attached to the sensor by screwing on the thread of the detector.
Using the sensor gard will extend the response time, depending on the
gas flow rate.
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