Preventive Maintenance
Electron capture detector (ECD)
flow through the system is available. Allow time for the system to become fully pressurized.
4.Close carrier gas flow at its source and monitor system pressure.
5.The system may be assumed to be leak•freeif no pressure drop is observed over a 10•minuteperiod.
6.If leakage is observed, use an appropriate leak•detectingfluid to check for leaks at detector column fittings and at the plugged vent.
7.The detector body itself is not a likely source of leaks; in any case, it cannot be disassembled without special license from the Nuclear Regulatory Commission or Agreement State Licensing Agency (USA only).
Caution
WARNING
Thermal cleaning
Detector disassembly and/or cleaning procedures other than thermal should be performed only by personnel trained and licensed appropriately to handle radioactive materials. Trace amounts of radioactive 63Ni may be removed during other procedures, causing possible hazardous exposure to µ•and X•radiation(bremsstrahlung).
Cleaning by bake•out of the detector is performed only after verification that carrier supply gas and flow system components, are leak•and contaminant•free.
To prevent possible hazardous contamination of the area with radioactive material, the detector exhaust vent always must be connected to a fume hood, or otherwise vented in compliance with the latest revision of Title 10, CFR, Part 20, or with state regulations with which the Nuclear Regulatory Commission has entered into an agreement (USA only). For other countries, consult with the appropriate agency for equivalent requirements.
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