1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSeptember 4, 20081SUBJECT 2075AOUTLINE OF INVESTIGATIONFORCO Gas Test Kit for Gas and Vapor Detectors and SensorsIssue Number: 1SEPTEMBER 4, 2008COPYRIGHT 2008 UNDERWRITERS LABORATORIES INC.UL CO
2、PYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSEPTEMBER 4, 2008SUBJECT 2075A2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 General 42.1
3、 Units of measurement .42.2 Undated references .43 Glossary .4CONSTRUCTION4 General 4PERFORMANCE5 Tests 5MARKING6 Product Marking 7Instructions7 Instructions .8SEPTEMBER 4, 2008 SUBJECT 2075A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULIN
4、TRODUCTION1 Scope1.1 These requirements cover CO gas test kits used to test CO gas and vapor detectors and sensors.1.2 The products covered by this outline of investigation are intended to be used as a means to test COgas and vapor detectors and sensors. Installation/operating document(s) and/or pro
5、duct markinginformation provided with the product describe the operation of the accessory.2 General2.1 Units of measurement2.1.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.2.2 Undated references2.2.1 Any undated reference to
6、 a code or standard appearing in the requirements of this standard shallbe interpreted as referring to the latest edition of that code or standard.3 Glossary3.1 For the purpose of this document the following definitions apply.3.2 CARBON MONOXIDE (CO) A colorless, odorless toxic gas.3.3 PPM Gas conce
7、ntration in parts per million.CONSTRUCTION4 General4.1 Gas test kits shall be constructed to comply with the following:4.2 The container shall have a DOT (Department of Transportation) rating suitable for the material beingdispensed. The manufacturer shall provide evidence that the DOT rating is sui
8、table.SEPTEMBER 4, 2008SUBJECT 2075A4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULPERFORMANCE5 Tests5.1 Except for 5.6 all tests are to be completed in sequential order.5.2 Sensitivity Test Conduct on 12 end product detectors or sensors per
9、 clause 15 of the standard forGas and Vapor Detectors and Sensors, UL 2075, (reference the sensitivity limits of Clause 38 of thestandard for Single and Multiple Station Carbon Monoxide Alarms, UL 2034, where appropriate).5.3 Normal Operation To be conducted as outlined in the operating instructions
10、 for the CO Gas Test Kiton 12 end product sample detectors.5.4 Abnormal Usage Expose 12 end product CO detectors to the abnormal exposure levels. The entirecontents of one can is to be dispensed as close to the sensor as possible (while the detector/sensor is inits normal operating configuration) to
11、 determine if subsequent operation of the detectors/sensor has beenadversely affected.5.5 Sensitivity Test Following 5.4, verify that the Sensitivity of the alarm has not been affected bysubjecting the samples to the Sensitivity Test outlined in Section 15 of Gas and Vapor Detectors andSensors, UL 2
12、075, (reference the CO sensitivity limits outlined in Section 38 of Single and Multiple StationCarbon Monoxide Detectors, UL 2034 where appropriate).5.6 As described/defined in the operating instructions, dispense the gas (CO) from the can into a gassample bag. Using a CO monitor/analyzer with an ac
13、curacy of 1 percent or better, analyze theconcentration of the CO that was injected into the gas sample bag. Verify that the measured COconcentration recorded by the CO analyzer is within 5 percent of the manufacturers specifications.Equivalent methods to quantify the gas concentration may be engine
14、ering reviewed to determine theirmeans of repeatability and reliability toward validating CO concentration contained within a can.5.7 Using the mechanical print provided by the manufacturer, calculate the internal volume of the can.Using 3 mutually exclusive end product cans of CO, measure and recor
15、d the CO concentration andpressure in each can. Using Boyles Law (Equation 1 below), calculate the volume of gas (CO andbalance gas) in each can at STP. This volume will indicate the maximum volume of the dispensed gas (atSTP conditions) at which the concentration as measured in 5.5 can exist (i.e.
16、worst-case COconcentration produced by a fully-dispensed can). The Ideal Gas Law shall then be applied to verify thatthe total amount of CO in the can does not exceed 3.22 x 10-4moles (approximately 9.0 mg) of CO at25C, 1 atm.NOTE: Equivalent concentrations that exceed the maximum allowable number o
17、f moles are to beindividually assessed. Additionally, an equivalent number of moles that exceeds the maximum of 1850ppm in concentration are to be individually assessed. See example below:SEPTEMBER 4, 2008 SUBJECT 2075A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION
18、WITHOUT PERMISSION FROM ULCO Test Kit (example)Measured CO concentration (inside can, at 298.15K): 1850 ppmCalculated internal can volume: 0.36 LCalculated internal can pressure: 11.5 barAt STP (298.15K, 1.01325 bar):Equation 1: P1V1=P2V2(Boyles Law):in which:P1= pressure within the can at 298.15KV1
19、= fixed internal volume of the canP1= the standard ambient pressure at 298.15K andSolve for V2(11.5 bar)(0.36L) = (1.01325 bar)(V2)WhereV2= (11.5 x 0.36)/(1.01325) = 4.086 LThis result indicates that the measured CO concentration of 1850 ppm can only fill a maximum of 4.086L of space at standard amb
20、ient conditions, after which the CO will diffuse into a larger volume and becomeless concentrated. Next, we will determine whether this CO gas test kit exceeds the defined maximumnumber of moles.Because 1 mole of gas at STP will occupy a specific volume, regardless of the molecular weight of thegas,
21、 we can use the following formula (Equation 2) to determine the volume fraction of the CO withrespect to the overall CO/balance gas mixture volume at STP:Equation 2: ppm (CO) = (Volume of CO at STP) / (Total Gas Volume at STP) x 1061850 ppm = (Volume of CO) / (4.086 L) x 106Therefore, the Volume of
22、the CO at STP is 0.007559 LNext, calculate the number of moles of CO, using the Ideal Gas Law (Equation 3).Equation 3: PV = nRT (Ideal Gas Law)in which:P = Pressure of the CO (Standard Ambient Pressure: 101.325 kPa)V = Volume of the CO in Ln = number of molesSEPTEMBER 4, 2008SUBJECT 2075A6UL COPYRIG
23、HTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULR = a constant, 8.134 JK-1mol-1T = Temperature of the CO (Standard Ambient Temp: 298.15K)Thus, at STP, the Ideal Gas Law becomes:(101.325kPa)(0.007559L) = n(8.134)(298.15K)Solving for “n” yields: n = (0.76
24、59)/(2425.1521) = 3.16 x 10-4moles of COThis result indicates that the measured number of moles of CO does not exceed the maximum allowableamount of 3.2 x 10-4moles.5.8 Quantitative Gas Chromatographic Analysis shall be conducted on samples of the gas mixture thatare at the manufacturers highest and
25、 lowest production tolerances of CO to diluting/balance gas (such asnitrogen) concentration.MARKING6 Product Marking6.1 The product marking shall include at least the following:a) Manufacturers name and address,b) CO level of gas within the container in ppm,c) A reference to the user installation in
26、structions and direction for use,d) An indication that the test gas is only to be used with detectors that are equipped with afunctional speed-up test feature,e) Information on maximum storage temperature and any other storage concerns andf) A statement that the product is intended for use only by a
27、larm installing/maintainingcompanies (or equivalent statement).SEPTEMBER 4, 2008 SUBJECT 2075A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULInstructions7 Instructions7.1 User Instructions (on marking or packaged with product) shall include
28、 at least the following:a) Instructions for proper use of the product,b) Reference to the CO detector/sensor installation/operating instructions on the action to takedepending upon the results of the test,c) A recommendation that detector test personnel who are exposed to repeated discharges ofthe test gas should wear personal CO detection badges,d) An indication that the product is intended for use only by alarm installing/maintainingcompanies (or equivalent statement).SEPTEMBER 4, 2008SUBJECT 2075A8
