For purge monitoring
October 1st 2005 Emptying hydrocarbon storage tanks or other vessels is dangerous because there is a risk of creating an explosive mix if the purging operation is not managed correctly.
Vessels have to be purged with nitrogen to reduce the hydrocarbon content to below the lower exposure limit (LEL) before air can be allowed into the enclosure.
Many gas detectors are not well equipped to measure hydrocarbons at this level and are prone to burn-out if exposed to higher levels.
The infrared technology in Crowcon’s Triple Plus+ IR has been designed for such applications. The device monitors purge vent gas to determine when there is less than 100% LEL equivalent flammable gas concentration. Costly nitrogen purging can be stopped as soon as it is safe, with no need to guess the time or to run the purge longer than necessary.
The Triple Plus+ IR is a dual range IR sensor for flammable hydrocarbons scaled with both 0 to 100% volume and 0 to 100% LEL ranges, with an automatic range switch between these. More articles from Crowcon Detection Instruments Ltd: | 
