6 Accessories
6.1 Calibration Cap
The calibration cap is pushed on to the front of the sensor and is sealed by an “O” ring. The surface area S < 20 cm2.
WARNING!
The calibrating cap must be removed after completing the calibration!
The gas is supplied via either of the gas inlets by means of suitable flexible tube.
Failure to follow these warnings can result in serious personal injury or death.
Gas flow rate: 1.0 l/min ±20%
6.2 Weather Protection Cap
The weather protection cap, protecting the sintered disc of the sensor from splash-water, is recommended for outdoor
installations. It is available in Stainless Steel 316.
The stainless steel versions are available with hose or pipe connection for remote calibration.
Pipe connection : 1/8” NPT
Gas flow rate : 1.0 l/min ±20%
Air velocity : 0 ... 6 m/s
Calibration must only be carried out if wind speed is < 1.5 m/s.
Using the Weather Protection Cap will extend the response time to:
t
90
< 80 sec for methane / t
90
< 130 sec for propane
The signals will be reduced by up to 20% when using the weather protection cap. This must be taken into consideration
during calibration and when adjusting alarm levels. The cap must not be used if the incident flow is bottom up.
GB Series 47K 18
6 Accessories
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