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Summary of Contents for Gemini 501-B
- Page 1 SMOKE DETECTORS SENSITIVITY ANALYZER Model 501-B USER’S GUIDE GEMINI SCIENTIFIC CORP. 1122-B ASTER AVENUE, SUNNYVALE, CA 94086 Phone: 408.554.0310 Fax: 408.554.7143 E-mail: Gemini@geminiscientific.com Web: http://www.geminiscientific.com Version 3 - May 2004...
- Page 2 ANALYZER FOR SMOKE DETECTORS Model 501-B Aerosol Generator USER’S GUIDE Serial No.: Date Calibrated: Inspected by: Sold To: GEMINI SCIENTIFIC CORP., 1122-B ASTER AVENUE, SUNNYVALE, CA 94086 For technical assistance, please dial 800.582.8882 Version 3 – May 2004...
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Page 3: Table Of Contents
Replacement Parts ........................17 TABLE 3 Accessories ..........................17 APPENDIX A Calibration of the Gemini 501-B ................... 18 APPENDIX B Nebulizer Assembly & Maintenance..................19 APPENDIX C Sample Smoke Detector Test Report .................. 20 APPENDIX D Instructions on How to Change the Vacuum Filter Element ..........21 APPENDIX E Material Safety Data Sheet - RUDOL OIL................ -
Page 4: Warranty
Gemini Scientific Corp.’s obligation under this Warranty relates to the original purchaser and is limited to a return of the purchase price or at the Gemini Scientific Corp.'s sole discretion, to the repair or replacement of the instrument or any of its parts, which prove to be defective. -
Page 5: Introduction
1.0 Introduction The Gemini 501-B Smoke Detector Analyzer/Aerosol Generator is an instrument ideally suited to measure the sensitivity response of installed smoke detectors. The Generator produces an aerosol with particles size characteristics resembling fire smoke. The range of concentration, between 0 and 45 mg/m 3 or from 0 to 4 %/ft obscuration (UL-268), is sufficient to trigger the alarm thresholds of all UL-approved ionization and photoelectric smoke detectors. -
Page 6: Principles Of Operation
3.0 Principles of Operation General The Gemini 501-B Aerosol Generator/Smoke Detector Analyzer operates on the principle of nebulization of a liquid to produce a poly-dispersed micro-sized spray with a relatively large mass median diameter. An impactor reduces the median diameter by selectively removing the larger diameter particles. The remaining aerosol is diluted by a large volume of room air at a constant rate from the blower. - Page 7 Figure 1, Front View of Model 501-B Function Switch (On / Off / Battery Recharge) Compressor/Pump Switch (On / Off) Concentration Adjust Knob Pressure Adjust Knob Pressure LED Indicator Dilution LED Indicator Timer Reset Button Pressure Line Jet Nebulizer Reservoir...
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Page 8: Manifold
3.2.3. Manifold The manifold is a central flow-switching chamber, which connects the nebulizer, impactor, vacuum line, drain outlet, and drain reservoir. It is from this chamber that adjustable portions of the aerosol are discarded through the drain and vacuum system while the remainder goes to the final test stream. -
Page 9: Blower. Hose, Wands, Wall-Mounted Adaptor, Diffuser And Shroud
1/2 inch away from the wall. For some older models of smoke detectors and duct detectors, a different size of shroud may be needed. Please contact Gemini Scientific for more info. -
Page 10: Operation
3.2.11 Operation The Model 501-B is equipped with a 12 V DC Ni-Metal-Hydride rechargeable battery (refer to pg. 4 Figure 1). Newer models (May 2004 or later Model) are also equipped with an AC Adapter/External Battery jack that can be connected to the provided AC Adapter (12VDC output) or any 12VDC battery. - Page 11 Important Battery Charging Notes: A) Do not operate charger with a damaged cord or plug. Have them replaced immediately. B) Do not disassemble charger. There are no consumer serviceable parts inside. C) DO NOT use any other battery charger. Any other charger may blow the fuse or shorten the battery life if the charging rate exceeds 1 amp.
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Page 12: Operating Instructions
4.0 Operating Instructions Initial Operation Working Standard. Establish a working standard for your analyzer when you receive the instrument for the first time and every time it is recalibrated. (Pg. 15 – 6.2) Location of Instrument. The tester should be used in a ventilated or large room to avoid exposing operator to aerosol concentration greater than the OSHA limit of 5 mg/m 3 . -
Page 13: Oil Temperature
Oil Temperature Oil temperature in the reservoir would affect the aerosol output. The sensitivity reading on the LCD is corrected for the temperature variation. If you are working at an ambient temperature below 70 °F on a consistent basis, the temperature may be too low to generate enough smoke. -
Page 14: Inspection Protocol And Test Procedures
5.0 Inspection Protocol and Test Procedures General Objective The Gemini 501-B Analyzer was designed to perform on-site inspections of installed smoke detectors to determine their sensitivities. Sensitivity is defined as the amount (concentration in mg/m 3 or obscuration in %/ft) of smoke needed to trigger the alarm of the detector under test. -
Page 15: Sensitivity Ranges
Consult the manufacturer, if necessary. Because of the built-in uncertainty of ± 0.4 %/ft in relating field test results from the Gemini 501-B to that of the UL smoke chamber, detectors with results ± 0.4 %/ft beyond the given range may be considered acceptable. - Page 16 Figure 2 is an example of the test decision tree and statements you can make based on the test results. It is based on a detector with the stated sensitivity of 3.0± 0.5 %/ft. Figure 2, Example of Test Decision Tree and Statement of Results Test Alarm Alarm...
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Page 17: Calibration And Accuracy
(60 L/min) and aerosol temperature at 75 °F. Estimated uncertainty based on our study relating detectors' sensitivity test results between the UL 268 Smoke box and the Gemini 501-B Tester is ± 0.4 %/ft (both operator and measurement errors). Operational Precautions (1) Attach drain reservoir to drain outlet before any operation. -
Page 18: Servicing
The benchmarks are the alarm threshold of the two detectors based on the LCD sensitivity readings of the instrument. Store these two working standard detectors and only use them to check the Gemini Tester. Any change in the alarm thresholds of these two detectors in subsequent tests can reasonably be assumed to be a shift in calibration of the instrument, rather than to shift in detector sensitivity. -
Page 19: Routine Maintenance
Concentration cannot be Filter overload Change filter element. adjusted to reach zero Vacuum line leaks or Locate and fix leak. Or contact Gemini. pump fails. Pump running, no pressure Major pressure leak Check for leak or pump function. Dilution air indicator stays at... -
Page 20: Replacement Parts
7.0 Replacement Parts Table of Parts This section contains information on replacement parts for Model 501-B, Aerosol Generator from Gemini Scientific Corp. or from the originating manufacturer. Table 2 Replacement Parts List Gemini Part Number Description B0100 12V Ni-Metal Hydride Battery... -
Page 21: Appendix A Calibration Of The Gemini 501-B
Since the minimum amount of smoke needed to trigger the alarm of the detector, defined as its sensitivity, is equivalent for both the UL smoke box as well as for the Gemini 501-B, the alarm points of detectors are used to bridge the two systems by making equivalent scales. -
Page 22: Appendix B Nebulizer Assembly & Maintenance
APPENDIX B: Nebulizer Assembly & Maintenance Note: Nebulizer Assembly consists of part #3,4,5,6,7,9, 11 only. O-RING TARGET O-RINGS PIECE HOUSING ORANGE COVER INLET DIP TUBE O-RING FILTER SCREEN RESERVOIR To Disassemble Nebulizer: Remove Inlet (8) with hose from Housing (2). Remove Housing with the Reservoir from the Manifold on the front panel with a pulling and twisting motion. -
Page 23: Appendix C Sample Smoke Detector Test Report
APPENDIX C: Sample Smoke Detector Test Report SMOKE DETECTOR TEST REPORT Annual Inspection & Function Test Bi-Annual Sensitivity Test Instrument used: Gemini 501-B S/N: Other: Property Name: Property Address: Property Contact Person: Building: Location: Room/Zone: Listed Detector Serial Brand/ Type... -
Page 24: Appendix D Instructions On How To Change The Vacuum Filter Element
APPENDIX D: Replacement of Vacuum Filter 1. Replace vacuum filter when the color on the filter element turns red. 2. Open the front panel by loosening the thumbscrews. 3. Loosen filter strap. 4. Locate elbow connectors with orange fittings on both ends of the vacuum filter. 5. -
Page 25: Appendix E Material Safety Data Sheet - Rudol Oil
APPENDIX E: Material Safety Data Sheet - RUDOL™ OIL... -
Page 27: Appendix F Pictorial Illustrations
APPENDIX F: Pictorial Illustrations Fig. A Correct way of filling the Fig. B Symptom of clogged nebulizer nebulizer Fig. C Removal of nebulizer Fig. D Removal of target piece from housing by twist & pull the housing motion... -
Page 28: Appendix G Duct Detector Testing
6. Insert the hose into the inlet tube of the detector that has been removed from the duct for testing. 7. Allow space for excess smoke to flow out. 8. Maintain green on the LED. The restrictor is available from Gemini. Contact Gemini at (408) 554-0310 if you have any questions. - Page 29 Additional instructions on how to connect the duct detector testing hose: Inlet tube (duct detector) Duct detector testing Restrictor Hose Fitting Hose from your tester hose (connector-hose) 1. Connect the optional duct detector testing hose (connector-hose) to the hose fitting from your tester as shown in the figure above.