Related Manuals for Grace 850
Summary of Contents for Grace 850
- Page 1 Model 850 Investigator’s Aid Accelerant and Gas Detector Operation and Maintenance www.graceindustries.com M850TM1215 © December 2015...
- Page 2 6. Operation: Adjusting Sensitivity 7. Operation: Scanning for Gases 9. Operation: Electronic Purge 11. Operation: Battery Life 12. Operation: Charging the Battery 13. Maintenance: Battery Maintenance 14. Maintenance: Sensor Maintenance 15. Maintenance: Replacement of Sensor 18. Model 850 Warranty Information...
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Page 3: Top View
Model 850 Top View Plug-In Sensor Sensor Guard Removable Telescoping Wand Locking Clips Guard Screen Telescoping Wand HI/LO Range Switch Retractile Cord Audio Annunciator ON / OFF Switch and Sensitivity Adjust Control Analog Meter Mute Switch Indicator LEDs Battery Transfer Switch... - Page 4 Model 850 Features & Benefits • Detects approx. 125 toxic/combustible gases and/or vapors including heating gases • Adjustable Sensitivity aids in pinpointing the source of high gas concentration • Solid State Sensor, housed in a protective guard, with a 6 foot coiled sensor cord •...
- Page 5 Model 850 Operation Turning ON • Turn the Model 850 ON by rotating the ON/OFF & Sensitivity Adjust Control clockwise until a click is heard. • Allow approximately three (3) minutes for the sensor to attain operating temperature and stabilize.
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Page 6: Adjusting Sensitivity
• Place the Range switch in the “HI” position. • Place the Purge and Mute switches in the down position. • The Model 850 is now ready for use and has a sensitivity of approximately 50 parts per million (ppm) for methane as the test gas. - Page 7 • When attempting to locate very small leaks or hydrocarbon vapors, slowly scan the area in question, holding the Model 850 at a 45 degree angle and one inch from the area being examined. • When gas or accelerants are detected, the audio and visual indicators will beep and flash in synchronism.
- Page 8 • If there is an area of suspicion and you do not get a reading, put the Model 850 in its most sensitive mode (indicated by a very slow beep and flash rate) and observe if any change in beep rate occurs upon further...
- Page 9 • After 15 to 30 seconds, slide Purge Switch to OFF position. • The unit will rapidly cease to annunciate and the Model 850 is now ready to detect another sample. • Before attempting to detect another sample: Turn Purge Switch OFF and reset sensitivity.
- Page 10 • When the Purge Switch is in the ON position, the detector’s circuits are disabled and the Model 850 will NOT detect the presence of gas or accelerants in this mode. • Turn Purge Switch OFF before attempting to detect a suspect area.
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Page 11: Battery Life
Model 850 Operation Battery Life • Model 850 is powered by two nickel cadmium cells. • Operating time for each cell is 4 hours. Total operating time is approximately 8 hours. • When battery power is low, a slow beeping sound will be observed. -
Page 12: Charging The Battery
Model 850 Operation Charging the Battery To charge your Model 850: • Turn unit OFF and insert charger plug into the Battery Charging Jack on the side of the unit. • Plug the charger/adapter into power source/outlet. Battery Charging Indicator Light will glow Red while the unit is charging. - Page 13 • For optimum performance from your Model 850, the following procedures are recommended: • Be certain the Model 850 is used a minimum of ten (10) hours per month, preferable several hours each week. If the unit is used less than ten hours, the following procedure should be observed to maintain peak performance.
- Page 14 Model 850 Maintenance Sensor Maintenance • Avoid getting debris or foreign material in the sensor. • If the sensor becomes contaminated, let the unit warm up and then lightly tap the sensor over a white piece of paper and observe if any material is dislodged.
- Page 15 Model 850 Maintenance Replacement of Sensor • Remove sensor guard screen. • Remove damaged or malfunctioning sensor from the socket located at the end of the telescoping probe. • Use a small screwdriver to carefully and incrementally loosen the sensor from the socket.
- Page 16 Model 850 Maintenance Replacement of Sensor • Plug in new replacement sensor by carefully aligning the sensor pins into the socket.
- Page 17 Model 850 Maintenance Replacement of Sensor • Gently and firmly press the replacement sensor into the socket until it is secure. • Allow for required warm-up period (approximately three (3) minutes) before use.
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Page 18: Warranty Information
Warranty Information Grace Industries, Inc. warrants Grace Industries, Inc. portable hydrocarbon detector Model 850 to be free from defects in workmanship and materials for a period of one year from the date of purchase. Grace Industries, Inc. will not repair or replace... - Page 19 Model 850 Investigator’s Aid www.graceindustries.com M850TM1215 © December 2015...
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