Accessories
PrimaX
62
GB
In general the hose should be as short as possible in order to:
- Minimise the gas volume needed to flush the tube
- Reduce external influences (e.g. temperature shift, pressure, etc.)
- Minimise the lead time
Hose material should be adapted to the applied test gas, have no absorptive or ad-
sorptive properties and should be made from inert material such as teflon or poly-
ethylene.
When using the CalGard in the hazardous area, a conductive hose must be used.
The free end of the test gas tube must be closed if no test gas is applied. This is to
prevent gas or air passing through the tube to the sensor, distorting the measure-
ment or in the reverse pressure conditions, the ambient atmosphere escapes from
the sensor at the free end of the tube.
To ensure proper function the CalGard remote calibration adaptor must be kept dry
and free of any contaminants, e.g. dust particles. Regular visual checks are recom-
mended. Any contaminants must be removed by blowing them off with clean, oil-
free compressed air or with a dry brush. Ensure that the air entrances are kept free
from any coating, e.g. paint, grease or similar.
Operation
Calibration procedure can be carried out as described in chapter 4.3 of this manual
To compensate for possible deviations during measurement of flammable gases a
calibration factor of 1.05 has to be applied.
Example: Calibration for methane.
Apply 40 %LEL methane and adjust to 1.05 x 40 = 42 %LEL
When using the CalGard for a remote calibration, the response time of the system
increases depending on the length of the test gas tubes used. If the calibration is
done automatically, set the calibration setup (menu: M04) with sufficiently long
countdown times for zero gas and calibration gas.
Example: When using a 10 metre long tube with an internal diameter of 5 mm and
applying a gas flow of 1 litre/min, the test gas takes a minimum of 20 sec to reach
the CalGard remote calibration adaptor. For safe flushing of CalGard, an additional
10 seconds has to be added to this calculation.
If the CalGard is being used with a control system (i.e. SUPREMA), please ensure
the manual for the controller has been read and understood.
The tube connector is adapted for tubes with an inner diameter of 5 mm.
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