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Features.........................................................................................................2 3. Mechanical Description..................................................................................3 4. Alarms............................................................................................................4 5. Operation.......................................................................................................6 6. Calibration......................................................................................................7 7. Sensor Replacement .....................................................................................8 8. Battery Replacement ...................................................................................10 9. Remote Sensor Option................................................................................11 10. Specifications...............................................................................................13 11. Limited Warranty..........................................................................................16 OXYGEN DEFICIENCY MONITOR PAGE 1 1. Introduction 1.1 The SMC Model 55 is a portable oxygen efficiency monitor for personnel in confined work places. It is self-contained, light weight and battery operated. It does not require any adjustments by the user other than routine calibrations. The monitor reads true percent oxygen in the presence of any diluents including humidity and will not be affected appreciably by barometric pressure changes caused by elevation or weather changes. OXYGEN DEFICIENCY MONITOR PAGE 1 2. Features 2.1 Features of the Model 55 include: • Temperature Stable • Barometric Pressure Insensitive • Large LCD digital display • High accuracy over temperature range 0-50oC • Fast response -90% full scale in 10 seconds • Visual Alarm – LED provided on top of case • External Earphone for noisy environments • Single ON/OFF sliding switch • Long Battery Life – 200 hours on a 9V battery • Low Battery indication – visual display • Small Size – Comfortable for belt water OXYGEN DEFICIENCY MONITOR PAGE 2 3. Mechanical Description 3.1 The Model 55 is housed in a rugged, high impact enclosre. The sliding ON/OFF power switch is located on the left side, the calibration potentiometer is accessible on the right side and the digital display is on the front surface. The top of the monitor and the digital display is on the front surface. The top of the monitor contains the sensor opening, jacks for earphone and remote sensor , the alarm LED and audible alarms. See Figure 1. 3.2 Located on the back surface of the monitor are a belt clip and the battery cover. OXYGEN DEFICIENCY MONITOR PAGE 3 4. Alarms 4.1 LOW OXYGEN CODITION: When the % oxygen falls below 19.5 (factory set) the digital display will be augmented by an audible alarm when using either internal or external sensor. The red LED will also truno on to provide visual indication. If an earphone is in use the alarm will only sound through the earphone. 4.2 LOW BATTERY VOLTAGE: When the battery voltage falls below 3.6 volts, the warning “BAT” will display in the upper left corner. 4.3 LOW SENSOR OUTPUT: Sensor failure will be indicated by abnormally low, unadjustable, reading on the LCD display. OXYGEN DEFICIENCY MONITOR PAGE 4 Figure 1 OXYGEN DEFICIENCY MONITOR PAGE 5 5. Operation 5.1 Turn the ON/OFF switch to “ON” position. 5.2 Display reads percent oxygen. 5.3 If the alarm sounds the percentage oxygen has dropped below the present alarm lever (factory set to 19.5%). The alarm will turn off automatically when the oxygen concentration rises above the alarm level. 5.4 If the word “BAT” is indicated on the display the battery must be replaced. 5.5 If the reading is abnormally low in an environment which is known to have sufficient oxygen, and the unit cannot be calibrated, the sensor life is complete and the sensor must be replaced. OXYGEN DEFICIENCY MONITOR PAGE 6 6. Calibration NOTE: This instruction assumes that only the internal sensor is in use (external probe disconnected). See option instructions for calibration of external probe. 6.1 Turn the monitor “ON” and place it in an environment containing 20.9% oxygen and 79.1% nitrogen. This can be supplied from a calibration cylinder or can be open air if it is known to be clean. 6.2 Adjust the monitor to read 20.9% by turning the set screw which is located on the right side of the monitor behind a black grommet. Use a small jewels screwdriver to make the adjustment. OXYGEN DEFICIENCY MONITOR PAGE 7 7. Sensor Replacement 7.1 Sensors for the Model 55 are provided in a sealed bag to prevent depletion of the electrolyte prior to required use. Sensor depletion begins when the bad seal is broken. 7.2 Remove the four screws from the rear of the monitor and open the case. 7.3 Remove the sensor from the clamp in the back panel and unplug it from the printed circuit board. 7.4 Insert the new sensor into t...
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