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N%. 1_0� <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 /> The unit will display a message to indicate that a cleaning or replacement is required. Cleaning <br /> of the window is done by using anhydrous methanol. After cleaning the lamp is inspected for <br /> any remaining film and the process is repeated if required until the lamp is clean. The sampling <br /> pump is rated for 4,000 to 5,000 hours of continuous operation. The pump is replaced after 6 <br /> months if the unit is heavily used, but does not need replacing for longer periods if only used <br /> occasionally. <br /> 42 <br />