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personalDataRAM, provides a switched output triggered by the alarm signal of the <br /> monitor. This switched output(up to 8 amperes,250 volts) can be used to activate <br /> or deactivate other equipment (e.g.ventilation systems,machinery,etc.), or to <br /> control remotely located (by wire connection) alarm indicators (e.g.buzzers, lights, <br /> etc.). <br /> 12.0 MAINTENANCE <br /> 12.1 General Guidelines <br /> The personalDataRAM is designed to be repaired at the factory. Access to the <br /> internal components of the unit by others than authorized MIE personnel voids <br /> warranty. The exception to this rule is the occasional cleaning of the optical sensing <br /> chamber. <br /> Unless a MALFUNCTION message is displayed, or other operational problems <br /> occur, the personalDataRAM should be returned to the factory once every two years <br /> for routine check out, test,cleaning and calibration check. <br /> 12.2 Cleaning of Optical Sensing Chamber <br /> Continued sampling of airborne particles may result in gradual build-up of <br /> contamination on the interior surfaces of the sensing chamber components. <br /> This may cause an excessive rate of increase in the optical background. If this <br /> background level becomes excessive, the personalDataRAM will alert the user at the <br /> completion of the zeroing sequence,as indicated in Section 8.1, by the display of a <br /> BACKGROUND HIGH message. If this message is presented,the personalDataRAM <br /> can continue to be operated providing accurate measurements. However,it is then <br /> advisable to clean the interior of the sensing chamber at the first convenient <br /> opportunity,proceeding as indicated below. <br /> 12.2.1 Model pDR-1000AN <br /> • Remove the two screws on the top of the large protective bumper that covers the <br /> sensing chamber (see Figure 1); <br /> • Remove the large protective bumper by lifting it firmly upwards and away from <br /> the sensing chamber; <br /> • Remove the socket-head screws on the front and back black covers that were <br /> exposed by removal of the large top bumper. Lift away the freed front and back <br /> covers of the sensing chamber; set them aside carefully and such that they can <br /> be reattached in the same position as they were previously; avoid touching the <br /> dull black side of these plates; <br /> • Using filtered (particle-free) pressurized air, blow the inside of the sensing <br /> chamber taking great care in not marring or scratching any of the exposed <br /> surfaces; <br /> • Reposition the two sensing chamber cover plates in the same location (front and <br /> back) as they had been originally. Insert and tighten socket head screws firmly <br /> 28 <br />