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INSTRUCTION MANUAL
OXYGEN DEFICIENCY MONITOR
(Model 55)
T10008
Rev A1
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TABLE OF CONTENTS 1. Introduction ....................................................................................................1 2. Features.........................................................................................................2 3. Mechanical Description..................................................................................3 4. Alarms............................................................................................................4 5. Operatio
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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
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2. Features 2.1 Features of the Model 55 include: • Temperature Stable • Barometric Pressure Insensitive • Large LCD digital display o • High accuracy over temperature range 0-50 C • 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
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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
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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
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Figure 1 OXYGEN DEFICIENCY MONITOR PAGE 5
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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
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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 behin
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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 the clamp. The sensor should be oriented as indicated in Figure 2 and the tip of the s
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FIGURE 2 Sensor Installation OXYGEN DEFICIENCY MONITOR PAGE 9
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8. Battery Replacement 8.1 When the “BAT” indicator is displayed approximately 8 hours of battery life remain. 8.2 Slide off the battery cover located on the lower rear of the unit. Remove the battery and disconnect. 8.3 Connect a new battery and carefully install it in the compartment taking care to stow the wires in a way in which they will not be crimped or cut by the cover. Place the cover back onto housing and secure with the four screws. OXYGEN DEFICIENCY MONITOR PAGE 10
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9. Remote Sensor Option 9.1 Use the remote sensor option to check the confined environment before entry. 9.2 Plug the probe into the top of the monitor and loop the cable securely around the belt clip. When the remote probe is plugged in the internal sensor is disabled and the display reads the remote probe concentration. 9.3 The remote probe will require 5-10 minutes to stabilize depending upon the time since last use. 9.4 Calibrate, if necessary, by following the instructions in Sec
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10. NOTICE The enclosed replacement sensor for your Model 55 Personal Oxygen Monitor is an enhanced version which will provide twice the operating life compared to sensors shipped prior to September, 2004. The enclosed sensor will operate for two years. To insure maximum life of your new sensor, please perform the following test: 1. Install the new sensor. 2. Allow 1 hour of stabilization 3. In a clean air environment, turn the calibration adjustment to increase the
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11. Specifications SENSOR OXYMAX™ oxygen concentration transducer. DISPLAY 3 digit LCD, %0 in air from 0% to 25.0% 2 with low battery indicator. o ACCURACY + 3% of full scale from 10 to 50 C o + 4% of full scale from 0 to 50 C RESPONSE 10 seconds to 90% indication RESOLUTION 0.1% Oxygen SENSOR LIFE 21 months in ambient air PRESSURE SENSITIVITY 0.33% 0 change for 300 foot elevation 2 change or 75 mm Hg barometric change. o TEMPERATURE Operating Range: 0 to 50 C OXYGEN DEFI
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CONTROLS ON/OFF switch. CALIBRATION ADJUSTMENT Calibrate both internal and external sensors against dry 0 /N Both 2 2. calibration adjustments are with jeweler screwdriver. ALARAMS Audible: Factory set to alarm below 19.5% 0 Visual: LED lights when 2. Audible Alarm sounds. CONNECTIONS Alarm earphone jack. External sensor jack. BATTERY 9V alkaline. 200 hours life typical. EARPHONE Supplied with 36” cable length. EXTERNAL SENSOR (Optional) Sensor, housing and circuitry provided wi
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WEIGHT 11 Oz. (0.3 Kg) INTERFERING GASES Ozone, chlorine and other highly oxidizing gases will interfere to the extent of their oxygen equivalent. Highly corrosive atmosphere will cause premature failure. CASE Three-piece, molded of high impact plastic. OXYGEN DEFICIENCY MONITOR PAGE 15
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12. Limited Warranty SIERRA MONITOR CORPORATION warrants its products to be free from defects in workmanship or material under normal use and service for two years after date of shipment. SMC will repair or replace without charge any equipment found to be defective during the warranty period. Final determination of the nature and responsibility for defective or damaged equipment will be made by SMC personnel. All warranties hereunder are contingent upon proper use in the application fo
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13. NOTICE – New 2-year Oxygen Sensor Thank you for your order for a SPC21111 Oxygen Sensor Assembly for your Model 55 Personal Oxygen Monitor. In this shipment you will find the new Sierra Monitor 2-year Oxygen sensor for your Model 55 Personal Oxygen Monitor. This enhanced version will provide twice the operating life compared to sensors shipped prior to September, 2004. To insure maximum life of your new sensor, please perform the following test: 1. Install the new sensor. 2. Allow
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WARRANTY REGISTRATION SERIAL # Model 55 Oxygen Deficiency Monitor Name: Company: Address: City/State/Zip: Phone: I am also interested in the following Sierra Monitor Products: Remote Probe for my Model 55 Oxygen Monitor Spare parts for Model 55 Sentry – Fixed installation monitor for Combustible, Oxygen, and Toxic Gases Other fixed installations Please send the Sierra Monitor General Catalog OXYGEN DEFICIENCY MONITOR PAGE 18
