CSA AM CSA ANSI Z21 94A-2007 Automatic Flammable Vapor Sensor Systems and Components Addenda to the First Edition《自动可燃蒸气传感系统和部件 第1版补遗》.pdf
《CSA AM CSA ANSI Z21 94A-2007 Automatic Flammable Vapor Sensor Systems and Components Addenda to the First Edition《自动可燃蒸气传感系统和部件 第1版补遗》.pdf》由会员分享,可在线阅读,更多相关《CSA AM CSA ANSI Z21 94A-2007 Automatic Flammable Vapor Sensor Systems and Components Addenda to the First Edition《自动可燃蒸气传感系统和部件 第1版补遗》.pdf(10页珍藏版)》请在麦多课文档分享上搜索。
1、ANSI Z21.94a-2007CSA 6.31a-2007Addenda to the First EditionANSI Z21.94-2006 CSA 6.31-2006American National Standard/ CSA Standard forAutomatic Flammable Vapor Sensor Systems and ComponentsCopyright CSA America, Inc. Provided by IHS under license with CSA/AM Not for ResaleNo reproduction or networkin
2、g permitted without license from IHS-,-,-Standard DeveloperAPPROVEDCSA AMERICA INC. 8501 East Pleasant Valley RoadCleveland, Ohio 44131CANADIAN STANDARDS ASSOCIATION5060 Spectrum Way, Suite 100Mississauga, Ontario, Canada L4W 5N6Published - October 2007Copyright 2007Canadian Standards AssociationPer
3、mission is granted to republish material herein in laws or ordinances, and in regulations, administrative orders, or similar documents issued by public authorities. Those desiring permission for other republication should consult Canadian Standards Association, 5060 Specrum Way, Suite 100, Mississau
4、ga, Ontario, Canada L4W 5N6.Copyright 2007CSA America, Inc.Permission is granted to republish material herein in laws or ordinances, and in regulations, administrative orders, or similar documents issued by public authorities. Those desiring permission for other republication should consult CSA Amer
5、ica, Inc., 8501 East Pleasant Valley Road, Cleveland, Ohio 44131.PrefaceThe standards set forth herein apply to the first edition of the Standard for Automatic Flammable Vapor Sensor Systems and Components, ANSI Z21.94-2006 CSA 6.31-2006, and supersede corresponding standards therein. Following thei
6、r preparation by the supervising Technical Advisory Group, they were accepted by the American National Standards Institute (ANSI) and the Interprovincial Gas Advisory Council (IGAC), and subsequently approved.NOTE: Changes, other than editorial, are denoted by a vertical line in the margin.July 17,
7、2007American National Standards Institute, Inc.September 14, 2007Interprovincial Advisory Council Effective in Canada May 1, 2009IGACCopyright CSA America, Inc. Provided by IHS under license with CSA/AM Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-1Part II: Perf
8、ormance2.2 Flammable Vapor SensitivityThe sensor or system under test shall produce a signal indicating that the flammable vapor limit has been reached, within the period of time specified by the manufacturer, but not to exceed 60 seconds, after being exposed to the flammable vapor limit, when teste
9、d in accordance with the following Method of Test. Method of TestThe sensor or the systems sensor components under test shall be tested in a chamber such as the typical chamber shown in Figures 1, Typical Flammable Vapor Sensor Test Chamber (Side view external wall) through 3, Typical Flammable Vapo
10、r Sensor Test Chamber (Top view), which is capable of maintaining the temperature and relative humidity conditions specified in Table VII, Temperature/RH Conditions.The accuracy and precision of the measurement test equipment shall be as shown in Table VIII, Requirements of Flammable Vapor Measureme
11、nt Test Equipment.The accuracy and precision of the test chamber shall be as shown in Table IX, Requirements of Flammable Vapor Measurement Test Chamber.The chamber shall be capable of generating and maintaining the flammable vapor at a uniform concentration throughout the test chamber equivalent to
12、 the flammable vapor limit (as specified by the manufacturer) by the injection of winter blend gasoline, through a means such as atomized into a fine mist.The chamber shall be capable of causing the gasoline vapor concentration surrounding the sensor to increase from zero percent, to the flammable v
13、apor limit (as specified by the manufacturer) within a period of 5 seconds.The signal from the sensor or system shall be monitored throughout each test.The sensor or system shall be maintained at test condition 1 of Table VII for a minimum period of two hours or until the sensors or systems signal d
14、oes not change by 5 percent over a period of 15 minutes. There shall be no gasoline vapor in the chamber during this period.Once the sensor or system has stabilized, it shall be exposed to a gasoline vapor concentration equivalent to the flammable vapor limit. The time required for the gasoline vapo
15、r concentration to increase to the flammable vapor limit at the sensor location shall not exceed 5 seconds. This gasoline vapor concentration shall be maintained throughout the remainder of the test. A suitable timer shall be started at the beginning of the 5-second vapor establishment period. The t
16、imer shall be operated until the sensor or system indicates that the flammable vapor limit has been reached. This time shall not exceed the time specified by the manufacturer, or 60 seconds, whichever is less.This test shall be repeated at test conditions 1 through 5 specified in Table VII.Copyright
17、 CSA America, Inc. Provided by IHS under license with CSA/AM Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-22.3 Continued PerformanceThe system shall demonstrate sufficient robustness to meet the requirements of the application at extreme operating conditions. Th
18、e same device(s) tested under 2.2, Flammable Vapor Sensitivity, or new devices from the same production run as the sample(s) tested under 2.2 shall be used for each section below, as specified by the manufacturer. Acceptance criteria is (1) no false trips during exposure and (2) successfully passing
19、 the requirements of 2.2 at ambient temperature and humidity when completed.Method of TestA sensor and/or system shall be subjected to each of the following tests:a. Sensor and/or systems shall be powered with rated voltage and operated continuously for 720 hours in clean air at maximum operating te
20、mperature and rated voltage.b. Sensor and /or systems shall be subjected to 100,000 on-off cycles in clean air. Duration of the on-off cycles shall be a joint decision between the testing agency and the sensor manufacturer with the goal of simulating operational cycles in its application. c. Sensor
21、and/or system shall be subjected to 14 days of thermal cycling between the extreme temperature likely to occur during normal use and which may result from ambient temperature variation, or the cycling of supply voltage. The ambient temperature shall be varied between the manufacturers declared Tmaxa
22、nd Tminoperating temperatures to cause the temperature of the components to be cycled between their declared operating extremes. The rate of ambient temperature change shall be approximately 2F/minute (1C/minute) and the temperature at Tmaxand Tminshall be maintained for at least 1 hour, or until th
23、e sample reaches ambient temperature, whichever is longer. Care shall be taken to avoid the occurrence of condensation during this test. During the temperature cycling test the sensor and/or system shall be energized to 110 percent of rated voltage, except for at least one 1 minute and no longer tha
24、n 30 minutes during each 24-hour period the sensor and/or system shall be deenergized. The deenergization is not to be synchronized with the change in the ambient temperature. d. The sensor or systems sensor component(s) shall be subjected to ten cycles of flammable vapor exposure. The sensor or sys
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