Oldham olct ir Technical Manual
Also see for olct ir: Technical manual
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195.2. Periodic maintenanceGas detection instruments are potential life -saving devices. Recognizing this fact, Industrial Scientific Corporationrecommends that a functional “bump” test be performed on every portable gas -monitoring instrument prior to eachday’s use. A functional test is defined as a brief exposure of the detector to a concentration of gas(es) in excess of thelowest alarm set-point for each sensor for the purpose of verifying sensor and alarm operation and is not intended to bea measure of the accuracy of the instrument.Industrial scientific further recommends that a full instrument calibration be performed using a certifiedconcentration(s) of calibration gas(es) monthly to ensure maximum accuracy.If an instrument fails to operate properly during any functional “bump” test, a full instrument calibration should beperformed successfully prior to use.These recommendations are based on safe work procedures, industry best practises, and regulatory standards to ensureworker safety. Industrial scientific is not responsible for setting safety practices and policies.5.3. Verificationÿ Equipment required:- Gas calibration kit (bottle of standard reference gas and its accessories)- A test coverÿ Procedure- Use the test cover to inject a standard reference gas (at 2 l/minute) and check the measurement ortriggering of alarms (note: without the test cover, the measurement may be underestimated (if wind> 20 kph)5.4. Calibration procedure for OLCT IR "E" version:ÿ Equipment required:- Gas calibration kit (bottle of standard reference gas and its accessories)- A magnetic to control the maintenance menu and validate the settings.Preparation:- Check that the facility is operating correctly- Set the measuring unit to calibration mode (relays disabled)- Unscrew the locking nut (Figure 3, Item 3) and remove the protective cover- Fit the calibration cover (fitted with two nozzles for injecting the standard reference gas) as shown inFigure 06- Connect the tube of the kit to one of the cover nozzles- Inject air or standard reference gas from the bottles at a rate of 1 l/mn to 2 l/mn (stabilisation time 2 mn).- The concentration of standard reference gas to be used is indicated on the sensor- The actions are carried out using a magnet in response to the red LED (Figure 2, Item 8).Calibration:Procedure- Check that only clean air is present in the detector. If this is not the case, purge it with nitrogen orreconstituted air to ensure that zero setting is correct before starting up the calibration menu as shown inthe diagram below.- Follow the instructions on the diagram.- At the end of the procedure stop the gas injection and refit the original anti-splash cover, checking that thearrow points upwards.- Return the measuring unit to "normal mode" (relays released). |
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