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H O LEAK DETECTOR APITRE 4 GE 12 AP-SOLUTION Many refrigerant detection devices also have varying sensitivity ranges that can be adjusted, as shown here: CHAPITRE 4 4PAGE 12 Using soap-solution A water-soap solution is the most popular, minimal cost, and one of the most effective methods used among servicing technicians. Applying a soap solution to joints, connections and fittings while system is running or under a standing pressure of nitrogen helps to identify leak points when bubbles appear, as shown here: TOPPING-UP SENSING BULB ON / OFF SWITCH Electronic refrigerant detector ON FLEXIBLE PROBE BATTERY LIFE INDICATOR BAT. OFF Use of soap-solution for leak detection Using an electronic refrigerant detector Electronic refrigerant detectors contain an element sensitive to a particular chemical component in a refrigerant. The device may be battery or AC-powered and often has a pump to suck in the gas and air mixture. Often, an audible “ticking” signal, and/or visible flashing indicating lamp increases in frequency and intensity as the sensor analyses higher concentrations of refrigerant, which suggests to the operator that the source of the leak is closer. Many modern refrigerant detectors have selector switches for switching between refrigerant types, e.g. chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), HFCs or HCs. HCFCs have less chlorine than CFCs and the sensitivity has to be changed by the selector switch. When using electronic refrigerant detectors in a workshop, always ensure good ventilation since sometimes it gives false signals due to other refrigerants being present in the surrounding area. Electronic refrigerant detectors may be used to detect hydrocarbons (HCs), but the sensitivity may not be adequate, or may need re- calibration. The detection equipment should be calibrated in a refrigerant-free area. Ensure that the detector is not a potential source of ignition and is suitable for hydrocarbon refrigerants. 100 Servicing PracticesPDF Image | Manual for Refrigeration Servicing Technicians
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