Once calibration is complete, the air inlet reopens to allow the monitoring of ambient air for gas without the need for
further user intervention.
6.6.1 Installation
For correct operation, Sensor S47K and CalGard must be used in a vertical position (hose connection pointing
downwards ±5°). The CalGard remote calibrator can be attached to the sensor by screwing on the thread of the
detector.
NOTE: The tube connector is adapted for tubes with an inner diameter of 5 mm.
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.)
• Minimize the lead time
Hose material should be adapted to the applied test gas, have no absorptive or adsorptive properties and should be
made from inert material such as teflon or polyethylene. When using the CalGard in the hazardous area, a conductive
hose must be used.
NOTE: 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 measurement or in the reverse pressure conditions, the ambient
atmosphere escapes from the sensor at the free end of the tube.
NOTE: To ensure proper function the CalGard must be kept dry and free of any contaminants, e.g. dust particles.
Regular visual checks are recommended. 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.
6.6.2 Operation
Calibration procedure can be carried out as described in chapter 5.1 of this manual.
NOTE: To compensate for possible deviations during measurement of flammable gases a calibration factor of 1.05 shall
be applied when using the CalGard for remote calibration.
NOTE: 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 via controller, set the calibration setup 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. For safe flushing of CalGard, an additional 10 seconds has to
be added to this calculation.
NOTE: 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.
NOTE: The pressure in the test gas tube increases with rising test gas flow rates. A flow rate of 1500 ml/min results in a
pressure up to 600 hPa. This has to be considered if a flow meter is used which is affected by the media pressure.
Materials: Stainless steel. 316
Dimensions: 60 x 122 [mm] dia. x height
Weight: 0,6 kg
Working temperature: -30 °C to +70 °C
Storage temperature: -30 °C to +70 °C
GB Series 47K 22
6 Accessories
To Next Page
Loading...
Need help?
General
