Refrigerant gas leak detection is becoming a high priority for many companies, especially considering the increasing price of refrigerant gas, not to mention emergency service call-out costs to find, detect and repair leaks of hydrofluorocarbons (HFC), chlorofluorocarbons (CFC), hydrochlorofluorocarbons (HCFC), Ammonia or CO2, and the potential for loss of inventory if a major leak renders a system inoperable. Installation of InfraRed Leak Detection Systems (IRLDS) is becoming increasingly important to be able to monitor for leaks in critical areas continuously. Along with the above concerns, depleting the ozone layer becomes everyone's responsibility to prevent further damage to the environment. One of the most difficult areas of sealed system servicing can be trying to find a refrigerant leak. The leak may exist within a series of tubing that may be up to hundreds of feet long or in a component that is not readily accessible or may even be, totally concealed. It could be in an operating or safety control such as a pressure switch, an expansion valve in a display case or in the compressor room located far from normal human traffic. Typical IRLDS leak monitors either employ detectors mounted at or near expected sources of fugitive emissions wired to a central console or a central sampling station which "pulls" a sample via pneumatics circuits to periodically introduce a representative sample into an analyzer/detector. Using detectors at each point poses a maintenance problem for the system operator as the routine maintenance and calibration has to be repeated once per sampling point. Automating the calibration requires additional cost and complexity to the system. IRLDS detection locates the sensing component at a central location, which can more easily be accessed for maintenance and calibration. Judicious use of flow or pressure sensing on each run of sample tubing can be used to detect filter or tube and filter blockage to make the well-designed sampling type of IRLDS a cost effective means to monitor for leaks in refrigeration systems. The Andros 6500-RM can address many of the needs of the integrator with the basic NDIR bench. Up to three sample points and a dedicated zero channel can be supported directly with the on-board 12 VDC solenoid valve drivers. Additionally a 12 VDC pump can be directly operated by the 6500-RM or can operate a relay to operate AC pumps when higher flow rates are needed. The 6500-RM has a differential pressure transducer available for flow measurement as well as an absolute pressure transducer for gas channel compensation and automatic shut off of the pump in case of sample cell overpressure.
|
