5.1.3 PG11 Function check using the “Gas nozzle”
This procedure is used for gas testing of detectors mounted high up or in another not easily
reachable location. Kit consists of a “Gas nozzle” on the nose of the detector. In between the
Gas nozzle and Gas test box there will be a gas pipe to allow for the gas to flow from the Gas
test box and into the Gas Detector through the Gas nozzle.
Requirements:
● Gas nozzle (if not already fitted)
● PG11 should be fitted with the Environment Shield especially if there is any wind.
● Gas cylinder with same type of gas as Detector is rated to detect
○ Concentration of test gas shall be above 40%FS
○ Flow rate of minimum 2 liters/min.
● Flexible gas hose
Procedure:
1. If PG11 is not already fitted with a Gas nozzle, please fit this to PG11 as illustrated
below at point A.
2. Verify that PG11 is fitted with an Environment Shield. Not having an Environment
Shield will make the gas dilute too quickly giving low gas reading, especially in windy
conditions.
3. Connect the test Gas cylinder to the Gas nozzle as illustrated below.
4. Apply the gas from the Gas cylinder with at least 2 liters/min flow rate.
5. Observe that the detector indicator is showing gas alarm or that a gas response is
received at the control system
6. With a response of more than 20 %FS the Gas Detector has passed the test.
Document 022-80036-OM Revision R03 Page 25 of 48
To Next Page
Loading...