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4.39 FIELD INSTRUMENT CALIBRATION, MAINTENANCE, <br />D REPORTING <br />UUM <br />The PID being used is a MiniRAE Plus Professional PID. The MiniRAE Plus is a <br />programmable Professional Photo Ionization Detector (PID) used to measure organic vapors in <br />hazardous environments. The instrument incorporates a sampling pump and data download <br />capabilities for continuous toxic monitoring, site survey, and leak detection applications. It can <br />measure two classes of toxic gases: (1) organic vapors with a 10.6 eV gas discharge lamp, and <br />(2) chlorinated compounds with a 11.7 eV gas discharge lamp. <br />Calibration of the unit in hygiene mode consists of a two point calibration process using <br />"zero gas" and standard reference gas. First, a "zero gas" which contains no detectable organic <br />vapors is used to set the zero point. Then a standard reference gas, which contains a known <br />concentration of a specific gas, is used to set the second point of reference. <br />The major items of the MiniRAE PID that require periodic maintenance are: <br />• Battery <br />• Probe Assembly <br />• Sensor Module <br />• Lamp <br />• Sampling Pump <br />The battery is recharged when a display flashes "bat". Charging time is less than 10 <br />hours and the unit will operate for 10 hours continuously on a charge. The probe assembly <br />contains a dust filter (steel wool) which is checked and replaced once a week, if required. The <br />sensor module may have a build up of gas vapor that causes a film to build up inside the module. <br />The module is normally cleaned after each use. Cleaning is performed using methanol and a <br />water rinse. The lamp will not turn on if there is an excessive film build-up on the lamp window. <br />47 <br />