Sierra Monitor Corporation 55 User's Manual
Contents
1. 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 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 for which the product was intended and do not cover products which have been modified or repaired without SMC approval or which have been subjected to accident improper maintenance installation or appli cation or on which original identification marks have been removed or altered This Limited Warranty also will not apply to interconnecting cables or wires consumables i e calibration gases batteries sensors nor to any damage resulting from battery leakage In all cases SMC s responsibility and liability under this warranty shall be limited to the cost of the equipment The purchaser must obtain shipping instructions for the prepaid return of any item under this warranty provision and compliance with such instruction shall be a condition of this warranty Except for the e2. Sil C sierra monitor corporation INSTRUCTION MANUAL OXYGEN DEFICIENCY MONITOR Model 55 T10008 Rev A1 ON 01 Go Na 0 TABLE OF CONTENTS INTTOGUCHON Lia 1 na eee ene ae 2 Mechanical Description i 3 AAMS ces ia aaa 4 Operation dia lalla lead ADI ili 6 ipa rogo iaia lella 7 Sensor Replacement i 8 Battery Replacement 10 Remote Sensor Option i 11 Specifications prin A LORA e la hiv 13 Limited Warranty nana genoa ed avd eed la av end 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 N Features of the Model 55 include Temperature Stable Barometric Pressure Insensitive Large LCD digital display 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 Earp
3. TIOMETER DISPLAY AUDIBLE ALARM _ ALARM LEO SENSOR OPENING ON OFF SWITCH do not cover REMOTE SENSOR JACK EARPHONE JACK 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 fo
4. he 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 Section 6 except that the adjusting screw is located in the back of the remote sensor head OXYGEN DEFICIENCY MONITOR PAGE 11 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 reading to its maximum value a If the maximum reading exceeds 23 Oxygen then the monitor circuit if OK Calibrate to 20 9 and return the monitor to normal use b If the maximum reading is lower than 23 but higher than 21 5 the monitor is safe to use but the sensor life may be less than two years The monitor may be returned to Sierra Monitor for a NO COST upgrade to insure full sensor life If the maximum reading is less than 21 5 the monitor is operating correctly and should be returned to Sierra Monit
5. hone for noisy environments Single ON OFF sliding switch Long Battery Life 200 hours 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 41 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 CALIBRATION POTEN
6. imum reading is less than 21 5 the monitor is not operating correctly and should be returned to Sierra Monitor for repair OXYGEN DEFICIENCY MONITOR PAGE 17 WARRANTY REGISTRATION SERIAL Model 55 Oxygen Deficiency Monitor Name Company Address City State Zip Phone 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
7. or for repair Thanks you for your confidence in Sierra Monitor Corporation gas detection products OXYGEN DEFICIENCY MONITOR PAGE 12 11 Specifications SENSOR transducer DISPLAY ACCURACY RESPONSE RESOLUTION SENSOR LIFE PRESSURE SENSITIVITY TEMPERATURE OXYGEN DEFICIENCY MONITOR OXYMAX oxygen concentration digit LCD 0zin air from 0 to 25 0 with low battery indicator 3 of full scale from 10 to 50 C 4 of full scale from 0 to 50 C 10 seconds to 90 indication 0 1 Oxygen 21 months in ambient air 0 33 0 change for 300 foot elevation change or 75 mm Hg barometric change Operating Range 0 to 50 C PAGE 13 CONTROLS CALIBRATION ADJUSTMENT ALARAMS CONNECTIONS BATTERY EARPHONE EXTERNAL SENSOR INTRINSIC SAFETY SIZE OXYGEN DEFICIENCY MONITOR ON OFF switch Calibrate both internal and external sensors against dry 02 3 Both calibration adjustments are with jeweler screwdriver Audible Factory set to alarm below 19 5 02 Visual LED lights when Audible Alarm sounds Alarm earphone jack External sensor jack 9V alkaline 200 hours life typical Supplied with 36 cable length Optional Sensor housing and circuitry provided with 20 foot cable Designed for intrinsic safety HWD 5 7 x 3 5 1 4 14 5 x 8 9 x 3 6 PAGE 14 WEIGHT 11 Oz 0 3 Kg INTERFERING GASES Ozone chlorine and other highly oxidizing gases will interfere to
8. r 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 sensor must rest inside the hole in the center Plug the connector into the printed circuit board 7 5 Replace the back cover and install the four screws Turn the monitor ON wait ten minutes and recalibrate OXYGEN DEFICIENCY MONITOR PAGE 8 RUBBER SEATING GROMMET FIGURE 2 Sensor Installation OXYGEN DEFICIENCY MONITOR PAGE 9 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 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 t
9. xpress warranty stated above SMC disclaims all warranties with regard to the products sold hereunder including all implied warranties of merchantability and fitness and the express warranties stated herein are in lieu of all obligations or liabilities on the part of SMC for damages including but not limited to consequential damages arising out of or in connection with the use or performance of the product OXYGEN DEFICIENCY MONITOR PAGE 16 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 Pe Install the new sensor 2 Allow1 hour of stabilization 3 In aclean air environment turn the calibration adjustment to increase the reading to its maximum value a If the maximum reading exceeds 23 Oxygen then the monitor circuit if OK Calibrate to 20 9 and return the monitor to normal use b If the maximum reading is lower than 23 but higher than 21 5 the monitor is safe to use but the sensor life may be less than two years The monitor may be returned to Sierra Monitor for a NO COST upgrade to insure full sensor life If the max
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