Expo-Telektron Safety Systems MiniPurge Z & Y Purge Manual ...

More documents

Recommendations

Info

Expo-Telektron MiniPurge Z purge Handbook ML 307 Issue A Relief Valve opens continuously or intermittently Is the PE pressure too high? NO Is there Debris on the RLV disk allowing air to leak from the valve? NO Call Expo-Telektron YES YES 8.2.1 Pressure sensor calibration C:\Main System Files\Marketing\Memo\ML307 ISSUE A.doc Page 8-4 If it is decided that the minimum pressure /purge flow sensor needs recalibrating it must be returned to Expo Telektron for this service The Leakage Compensation Valve (LCV) is too far open. Adjust the LCV as described in Section 6.9.2 above. Remove the RLV cover and clean the valve disk. If it is necessary to remove the disk and sping from the RLV draw a line around it with a pencil to allow accurate replacement before removal, otherwise the opening pressure may be affected. Page 8-4
Expo-Telektron MiniPurge Z purge Handbook ML 307 Issue A 8.3 Fault Finding (CF) "Pressurized/Purging" indicator will not turn green during start-up Is there insufficient Purging Flow due to indadequate air supply pressure? YES Is the supply pipe at least as big as the CU inlet fitting, i.e. at least 12mm/1/2" Nominal Bore? YES Is there excessive Pressurized Enclosure (PE) leakage? YES Is the PE strong enough? YES The Minimum Pressure Sensor is not operating correctly or out of calibration. NO Call Expo-Telektron NO NO YES NO NO C:\Main System Files\Marketing\Memo\ML307 ISSUE A.doc Check the air supply pressure at the inlet to the CUwhen purging is taking place. Replace pipework Any significant leakage must be corrected. Check for leakage down the cables or conduit. Ensure leakage does not exceed 60 NI/min (2 scfm). The standard requires that the PE is tested to 1.5 times the Relief Valve opening pressure e.g. 15mb/6" wc for many enclosures. Has this been done? The basic operation of the Minimum Pressure sensor can be checked by unscrewing the 60mm/2" diameter diaphragm housing and, by using a rubber pad, e.g. an eraser, block the 12mm/1/2" threaded hole in the top of the valve module. The valve should operate and the indicator turn green. If this is correct the sensor diaphragm needs recalibrating or replacing. Page 8-5 Page 8-5
Page 1 and 2: Expo-Telektron MiniPurge Handbook M
Page 7 and 8: Expo-Telektron MiniPurge Z purge Ha
Page 27: Expo-Telektron MiniPurge Z purge Ha
Page 43: Expo-Telektron MiniPurge Z purge Ha

Expo-Telektron Safety Systems MiniPurge Z & Y Purge Manual ...

Create successful ePaper yourself

Delete template?

Save as template?