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Thermo GasTech CO-95, Operator'S Manual

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Thermo GasTech CO-95 Operator'S Manual Download Page 27

71-0011 — REV E

4-1

CALIBRATION &
MAINTENANCE

OVERVIEW

This chapter contains calibration instructions for all models of 
the 95 Series single-gas monitors.

A troubleshooting guide, alarm setting procedures, and field 
replaceable unit (FRU) replacement procedures are also provided 
in this chapter. A part number list for FRUs and accessories is on 
the final page.

CAUTION

Calibrate or perform maintenance on your instrument only in a 
“fresh air” environment. For the HS-95, this is an environment 
free of H

2

S. For the CO-95, this is an environment free of CO. For 

the OX-95, this is an environment known to consist of normal O

2

 

content.

CHAPTER

 4  

Summary of Contents for CO-95

Page 1: ...95 Series Operator s Guide Personal Portable Gas Monitor HS 95 CO 95 OX 95 ...

Page 2: ...ogos are trademarks of their respective owners GASTECH is a trademark of Thermo GasTech and is registered with the U S Patent and Trademark Office DISCLAIMER Under no circumstances will Thermo GasTech be liable for any claims losses or damages resulting from or arising out of the repair or modification of the equipment by a party other than Thermo GasTech or its authorized service representatives ...

Page 3: ...UTION Notifies you of potential damage to equipment NOTE Notifies you of additional or critical information THIS INSTRUMENT IS DESIGNED TO DETECT ONE OR MORE OF THE FOLLOWING FLAMMABLE VAPORS OXYGEN CONTENT AND OR TOXIC GAS AND TO GIVE WARNING BEFORE THEY REACH HARMFUL CONDITIONS IN ORDER TO ENSURE THAT IT WILL WARN OF DANGEROUS CONCENTRATIONS IT IS ESSENTIAL THAT THE INSTRUCTIONS IN THIS MANUAL P...

Page 4: ...provide a purchase order number If you needtosetalimittotherepairscosts statea NottoExceed figure If you need a quotation before you can authorized the repair costs so state but understand this will incur additional costs and may delay processing of the repair Youmaysendtheunit prepaid to ThermoGasTech 8407Central Ave Newark CA 94560 3431 Attn Service Department Enclosethecopy of the RMA Return Ma...

Page 5: ...e extent the same is assignable In no event shall the Company have any obligation to make repairs replacements or corrections required in whole or in part as the result of i normal wear and tear ii accident disaster or event of force majeure iii misuse fault or negligence of or by Customer iv use of the Products in a manner for which they were not designed v causes external to the Products such as...

Page 6: ...vi 71 0011 REV E ...

Page 7: ...onics Assembly 2 3 Buzzer 2 4 Housing Housing Gasket 2 4 Sensor 2 5 Battery Compartment 2 5 Chapter 3 START UP OPERATION 3 1 OVERVIEW 3 1 START UP 3 2 INSTRUMENT OPERATION 3 3 Alarm Indications 3 3 Low or Dead Battery Indications 3 4 Weak or Failed Sensor Indications 3 5 INTERFERENCE CHARTS 3 6 OPTIONAL ACCESSORIES 3 8 Hand aspirated Sample draw Adapter 3 8 Earphone 3 9 Vibrating Alarm 3 9 ...

Page 8: ...t 4 3 CALIBRATION PROCEDURES 4 3 Preparing for Calibration all models 4 4 How to Use the Control Buttons 4 4 Calibration HS 95 CO 95 4 6 Calibration OX 95 4 7 If Calibration Fails 4 8 Switch to Default Zero OX 95 4 9 Return to Normal Operation 4 10 MAINTENANCE 4 11 How to Open and Close Your Monitor 4 11 Troubleshooting Guide 4 12 Changing Alarm Setpoints 4 13 Changing the Alarm Delay 4 14 Replaci...

Page 9: ...s are in Chapter 3 Start Up and Operation Chapter 4 Calibration and Maintenance also contains troubleshooting information and a list of replacement part numbers DESCRIPTION The 95 Series is a line of three personal portable gas monitors that each detect one gas Each pocket size instrument detects either oxygen O2 hydrogen sulfide H2S or carbon monoxide CO and actuates an alarm to alert you should ...

Page 10: ...programmable HS 95 10 ppm and 15 ppm programmable CO 95 25 ppm 200 ppm programmable Gas Alarm Delay 3 sec programmable to 0 1 2 or 3 sec Other Alarm Modes Weak or failed sensor low or dead battery Operator Controls Power switch ZERO button SPAN button Dimensions Weight 4 5 in H x 2 5 in W x 1 0 in D 6 5 ounces Battery Life approximate Continuous non alarm operation per one 9V alkaline battery OX 9...

Page 11: ... guide the monitor is described as having front and rear housing halves as shown in Figure 2 1 PHYSICAL DESCRIPTION To open your monitor loosen the two captive screws on the rear cover then separate the two halves The components identified in Figure 2 1 are described in this chapter The field replaceable units FRUs include the housing gasket sensor and battery CHAPTER 2 ...

Page 12: ...drophobic membrane behind grille Sensor Port Buzzer Port FRONT HOUSING HOUSING GASKET Operator Controls Cover Earphone Jack Cover ELECTRONICS ASSEMBLY Display Board Display Cable Main Board Buzzer Battery Compartment REAR HOUSING Earphone Jack Span Button Power Switch Zero Button Plug in Sensor LCD ...

Page 13: ...rol circuitry for other components is also located on the main board ZERO and SPAN Buttons The ZERO button alone is used to zero the sensor and decrease parameter settings The SPAN button alone is used to set sensor span and increase parameter settings The ZERO and SPAN buttons are pressed together to select setting modes Power Switch Set to the left position toward the sensor to turn the instrume...

Page 14: ...ted on the main board Housing Housing Gasket The instrument housing is a two piece plastic case held together by two captive screws A mylar gasket covers the operator controls to keep water and dust away from the internal components The case is sealed using a detachable rubber gasket and two flaps to protect the operator controls and earphone vibrating alarm jack The letters Z P and S on the insid...

Page 15: ...sor opening is held down by a gasket The membrane permits diffusion of the surrounding atmosphere to the sensor When sufficiently exposed to the target gas the electrical output of the sensor causes a reading on the display Readings are in parts per million PPM for H2S and CO or percent by volume for O2 Battery Compartment The battery compartment houses a standard 9V alkaline battery ...

Page 16: ...95 Series Operator s Guide 2 6 71 0011 REV E ...

Page 17: ...operation Normal operation is any time that start up has been completed and the monitor is not indicating an alarm fault or low battery condition This chapter also contains interference charts listing other gases that can affect the sensor in the HS 95 or CO 95 monitor and procedures to use the optional accessories available for your monitor CHAPTER 3 ...

Page 18: ... display the installed version of software A number will then be displayed Allow a few seconds for the reading to stabilize then check the display If your HS 95 or CO 95 shows a reading of 0 PPM or your OX 95 a reading of 20 9 proceed to Step 4 If the reading is anything other than this perform Step 2 or 3 as appropriate 2 Zero the HS 95 or CO 95 by pressing the ZERO button until the PASS message ...

Page 19: ...arm setpoint the alarm is indicated by the buzzer pulsing the red alarm light flashing and the gas reading blinking all in unison For the HS 95 and the CO 95 the gas alarm is a pulsing audible tone with a blinking reading for the low level alarm and a steady audible tone with pulsing display for the high level alarm For the OX 95 you can tell whether the alarm is a high or low alarm by the gas rea...

Page 20: ...er has passed Low or Dead Battery Indications Low Battery When your monitor senses that the battery has approximately 8 hours remaining the word LOBAT blinks on the LCD In addition the buzzer emits a short chirp and the red alarm light flashes every 30 seconds Dead Battery When the battery is past the point of useful operation LOBAT appears steadily on the LCD In addition the buzzer sounds continu...

Page 21: ... word FAULT is displayed on the LCD In addition the buzzer sounds continuously and the red alarm light is on steady A fault condition is caused by a missing or bad sensor a bad connection or a main board sensor circuit fault Recommended Action Remove the instrument from the monitoring environment Refer to the troubleshooting guide in Chapter 4 to determine the cause of the alarm condition and the ...

Page 22: ... Table 3 1 HS 95 Interference Chart H2S Sensor Interfering Gas Concentration Tested Reading Acetylene C2H2 50 ppm 170 ppm Chlorine Cl2 5 ppm Negative response AVOID Dimethyl sulfide CH3 2S 2 8 ppm No response Hexane C6H14 4400 ppm No response Hydrogen H2 10 000 ppm 8 ppm Methane CH4 2 5 No response Methanol CH3OH 1000 ppm No response Methyl mercaptan CH3SH 5 ppm 6 ppm Nitrogen dioxide NO2 10 ppm 1...

Page 23: ... produce an interference reading Table 3 2 CO 95 Interference Chart CO Sensor Interfering Gas Concentration Tested Reading Acetylene C2H2 100 ppm No response Chlorine Cl2 7 ppm No response Hexane C6H14 4400 ppm No response Hydrogen H2 100 ppm 12 ppm Hydrogen sulfide H2S 10 ppm No response Methane CH4 2 5 No response Methanol CH3OH 1000 ppm No response Methyl mercaptan CH3SH 5 ppm No response Nitro...

Page 24: ...gs and a probe How to Use 1 Attach the test cup over the sensor port The cup fits into the groove around the port and is held snugly by the retainer arm pressing onto the back of the instrument 2 Place the probe in the sampling location 3 Squeeze the aspirator bulb repeatedly until the display stabilizes Continue to squeeze the bulb repeatedly during the monitoring process to maintain the sample f...

Page 25: ...rt the earpiece into your ear Vibrating Alarm Description The Vibrating Alarm is housed in its own compact case with a cord and adapter that plug into the 95 Series earphone vibrating alarm jack It operates from its own batteries and vibrates simultaneously with the alarms of the monitor It has its own clip that can be attached to the belt or shirt pocket How to Use 1 Plug the Vibrating Alarm into...

Page 26: ...11 REV E Note Vibration should always occur with the audible buzzer and display light If it does not vibrate replace the battery see chapter 4 for maintenance NOTE Close the earphone flap when the earphone or vibrating alarm is not in use ...

Page 27: ...laceable unit FRU replacement procedures are also provided in this chapter A part number list for FRUs and accessories is on the final page CAUTION Calibrate or perform maintenance on your instrument only in a fresh air environment For the HS 95 this is an environment free of H2S For the CO 95 this is an environment free of CO For the OX 95 this is an environment known to consist of normal O2 cont...

Page 28: ...released when the regulator or dispensing valve is attached to the cylinder and the flow control knob is opened H2S Regulator for HS 95 The H2S regulator allows the test gas to flow to the HS 95 at a fixed flow rate The regulator gauge shows the pressure of the gas in the cylinder The flow control knob opens and closes the regulator To connect screw the regulator onto the cylinder and install the ...

Page 29: ...6 in I D flexible vinyl tubing connects the cylinder the flowmeter CO 95 and OX 95 and the test cup Test Kit Instruction Sheet The test kit instruction sheet describes how to prepare and operate the test kit with the 95 Series gas monitors CALIBRATION PROCEDURES Calibration procedures include preparing your instrument verifying or adjusting zero verifying or adjusting span then returning your inst...

Page 30: ...as outlet of the regulator or dispensing valve For the HS 95 securely attach the other end of the tubing directly to the test cup 3 For the CO 95 or OX 95 attach the other end of the tubing from the dispensing valve to the inlet bottom connector of the flowmeter Attach a second piece of tubing between the outlet upper connector of the flowmeter and the test cup CAUTION The flowmeter must be vertic...

Page 31: ...elay d and normal When any setting mode is active the mode letter is displayed to the left of the setting C for setting the span calibration L for setting the low and H for setting the high alarm and d for setting the alarm delay Normal mode is not indicated by a letter The space to the left of the current gas reading is blank In all setting modes press and release ZERO to decrease and SPAN to inc...

Page 32: ...appears The value displayed is the current span calibration setting If necessary press the ZERO or SPAN button to change the setting to match the concentration indicated on the test gas cylinder 3 When the values match return to normal mode by pressing and releasing ZERO and SPAN twice The instrument passes through set gas alarm L H modes and set delay d mode and enters normal mode 4 Fit the test ...

Page 33: ...arm is inhibited to allow you to finish calibration without setting off the alarm During the inhibit period a rotating pattern of horizontal bars appears to the left of the gas reading to remind you that the alarm is shut off Calibration OX 95 Open the operator controls flap and slide the power switch on toward the sensor Allow a few seconds for the instrument to stabilize 1 Fit the test cup into ...

Page 34: ...SS or FAIL message is displayed The instrument returns to normal mode with no additional alarm inhibition NOTE The OX 95 gas alarms are inhibited for 2 minutes after a successful PASS zero calibration and after an unsuccessful FAIL span calibration This allows you to finish calibration without setting off an alarm During the inhibit period a rotating pattern of horizontal bars appears to the left ...

Page 35: ...o 0 A rotating pattern of horizontal bars appears for 2 minutes and then the low O2 alarm occurs the buzzer pulses the red alarm light flashes and the reading blinks To restore proper function the instrument must be rezeroed with N2 test gas To keep the instrument operational in the meantime you can switch to the default zero value 1 Go to default zero mode by pressing and releasing the ZERO and S...

Page 36: ...the test cup and close the flap that covers the operator controls 3 Disassemble the test kit Store the components in the storage case You can leave the hoses attached for the next calibration Your instrument is now ready for normal operation NOTE While in normal mode the HS 95 or CO 95 goes into a FAULT condition if you press the SPAN button for several seconds without introducing calibration gas ...

Page 37: ...e screws on the rear housing then separate the two halves The gasket normally remains attached to the front housing but may slip out of its retaining groove To close first verify that the gasket is securely within the groove around the front housing Then place the two halves together and tighten the two screws Test the placement and seal of the gasket by closing its two flaps Each flap should neat...

Page 38: ... operating level Instrument inoperative Replace the battery immediately Steady FAULT message Steady buzzer and alarm light Bad sensor or faulty sensor circuit Or improper calibration Recalibrate If the indication persists replace the sensor and recalibrate If the indication persists contact the factory for repair Blinking FAULT message No buzzer or alarm light Sensor is still functioning but is ne...

Page 39: ...ions To adjust an alarm setpoint turn your monitor on allow it to stabilize for a few seconds then perform the following steps Refer to Figure 2 1 for locations of the buttons 1 Press and release the ZERO and SPAN buttons simultaneously one or more times until the letter L or H is displayed indicating the desired alarm 2 The current alarm setpoint is displayed Press the ZERO button to decrease and...

Page 40: ...N buttons simultaneously one or more times until the character d is displayed on the LCD indicating the delay setting mode 2 The current alarm delay is displayed Press the ZERO button to decrease and the SPAN button to increase the alarm delay setting 3 When the desired value is displayed exit by pressing and releasing the ZERO and SPAN buttons simultaneously one or more times until normal mode co...

Page 41: ...two pins O2 that match the socket pattern on the main board Align the pins of the new sensor with the socket then insert them straight down into the board 4 Securely close your monitor 5 Allow at least 1 hour for the new CO or H2S sensor or 5 minutes for the O2 sensor to stabilize before turning on your monitor 6 Calibrate the new sensor before using the instrument NOTE If the FAIL message was dis...

Page 42: ...y spent the sensor has lost its bias In this case allow at least 1 hour after battery replacement before turning on the monitor If the battery was low but still functional when it was replaced allow 15 minutes For the OX 95 allow 5 minutes 5 After turning your monitor back on verify proper calibration before actual use If recalibration is needed for an HS 95 or CO 95 wait 1 hour after battery repl...

Page 43: ...ce the screw used in step 2 6 Test the Vibrating Alarm using the Testing instructions If The alarm does not vibrate after changing the batteries contact Thermo GasTech for futher instructions Electronics Assembly Components The electronics assembly consists of the main board power switch buttons earphone vibrating alarm jack liquid crystal display LCD and display cable If any of these components f...

Page 44: ...95 Series Operator s Guide 4 18 71 0011 REV E Figure 4 1 95 Series Gas Monitor FRU Locations Housing Gasket 9V Battery Plug in Sensor O ring 2 Place thumb on buzzer when removing sensor ...

Page 45: ...eries vibrating alarm 49 1302 9V alkaline battery 52 2022 Vibrating alarm 52 7515 Earphone alarm 65 1059 O2 sensor for OX 95 65 2007 CO sensor for CO 95 65 2037 H2S sensor for HS 95 71 0011 Operator s Guide 72 0020 02 OX 95 gas monitor 73 0010 01 CO 95 gas monitor 73 0011 01 HS 95 gas monitor 81 0066 Test gas cylinder 200 ppm CO in air 81 0078 Test gas cylinder 100 N2 81 0151 Test gas cylinder 25 ...

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