SAE J 2912-2014 Performance Requirements for R-134a and R-1234yf Refrigerant Diagnostic Identifiers (RDI) for Use with Mobile Air Conditioning Systems.pdf

1、 SURFACE VEHICLE STANDARD J2912 DEC2014 Issued 2011-02 Revised 2014-12 Superseding J2912 NOV2013 Performance Requirements for R-134a and R-1234yf Refrigerant Diagnostic Identifiers (RDI) for Use with Mobile Air Conditioning Systems RATIONALE This standard is being updated to include USB communicatio

2、n protocol required for use with SAE J3030 certified equipment when configured for use with R134a. Two of the mixture tests, incorporating R-1243zf are deleted to enhance identifier performance by eliminating testing for a fluid with no known potential for mobile A/C application as a refrigerant at

3、this time. 1. SCOPE This SAE Standard applies to refrigerant identification equipment to be used for identifying refrigerant HFC-134a (R-134a) and HFO-1234yf (R-1234yf) refrigerant when servicing a mobile A/C system or for identifying refrigerant in a container to be used to charge a mobile A/C syst

4、em. Identification of other refrigerants is the option of the equipment manufacturer, although it shall not misidentify refrigerants, per 3.2. 1.1 Purpose Establishing such specifications will ensure equipment that meets this standard can identify relatively pure refrigerant HFC-134a (R-134a) and HF

5、O-1234yf (R-1234yf) from mixtures of refrigerants (HFC, HCFC, CFC, hydrocarbons, etc.), in a refrigerant supply tank, or mobile system prior to recovering/recycling (R/R) the refrigerant or prior to charging an A/C system from a refrigerant container. The identifier also shall identify and display w

6、eight of non-condensable gases, such as air. The displays shall be in percentages, per 3.1.3, and to the specified accuracies. _ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is en

7、tirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancel

8、led. SAE invites your written comments and suggestions. Copyright 2014 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, withou

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10、e visit http:/www.sae.org/technical/standards/J2912_201412 SAE INTERNATIONAL J2912 Revised DEC2014 Page 2 of 11 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publ

11、ications shall apply. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J639 Safety Standards for Motor Vehicle Refrigerant Vapor Compression Systems SA

12、E J1739 Potential Failure Mode and Effects Analysis in Design (Design FMEA), Potential Failure Mode and Effects Analysis in Manufacturing and Assembly Processes (Process FMEA) SAE J2843 R-1234yf HFO-1234yf Recovery/Recycling/Recharging Equipment for Flammable Refrigerants for Mobile Air-Conditioning

13、 Systems SAE J2845 R-1234yf HFO-1234yf AND R-744 Technician Training for Service and Containment of Refrigerants Used in Mobile A/C Systems SAE J2911 Procedure for Certification that Requirements for Mobile Air Conditioning System Components, Service Equipment, and Service Technician Training Meet S

14、AE J Standards SAE J2927 R-1234yf Refrigerant Identifier Installed In Recovery and Recycling Equipment For Use With Mobile A/C Systems SAE J3030 Automotive Refrigerant Recovery/Recycling/Recharging Equipment Intended for Use with Both R1234yf and R134a. 2.1.2 UL Publication Available from UL, 333 Pf

15、ingsten Road, Northbrook, IL 60062-2096, Tel: 847-272-8800, . UL 1963 Equipment evaluated under this document shall have the following specification and general description. 3. TECHNICAL REQUIREMENTS 3.1 The identifier shall be suitable for use in safely identifying HFO-1234yf (R-1234yf), an A2L cla

16、ssified flammable refrigerant. 3.1.1 The identifier shall be suitable for use in an automotive service garage environment and be capable of continuous operation in ambients from 10 to 49 C. 3.1.2 The identifier shall be design certified as an “R-134a/R-1234yf Refrigerant Diagnostic Identifier” and s

17、hall carry this labeling and also the following: “Certified to meet SAE J2912.” Tools that do not meet this standard shall not be referred to by this name or carry this labeling. Within this standard the term RDI may be used to mean R-134a/R-1234yf refrigerant diagnostic identifier. SAE INTERNATIONA

18、L J2912 Revised DEC2014 Page 3 of 11 3.1.3 Refrigerant Diagnostic Identifier The R-134a/R-1234yf refrigerant diagnostic identifier shall have a panel that displays the percentages of R-134a and R-1234yf in the refrigerant sample, with the following levels of accuracy, based on a percentage of non-co

19、ndensable gasses that is 20% or less: a. If the refrigerant in the sample contains 90% or more of either refrigerant, the displayed percentage shall be accurate to r1% points or better. b. If the refrigerant in the sample contains 70 to less than 90% of either refrigerant, the displayed percentage s

20、hall not display as greater than 92% pure. c. If the refrigerant in the sample contains less than 70% of either refrigerant, but the percentage makes it the primary refrigerant, the displayed percentage shall not display as greater than 85% pure. d. The percentages listed shall be for the refrigeran

21、ts listed in 3.2, and pursuant to the testing in 5.8. 3.1.4 Non-condensable gases including air shall be displayed if in weight of 3% or greater of the sample, provided the refrigerant sample is identified as 95% or greater of R-134a or R-1234yf. The display then shall be accurate to r2% points if N

22、CG is in the range of 3 to 10% of the sample. The display shall be accurate to within r3% points if NCG is in the range of 11 to 20%. If NCG content is in excess of 20%, up to 50%, the display shall be accurate to within r10 percentage points. If NCG content is in excess of 50%, the display may simp

23、ly read over 50 or an equivalent listed in the instruction manual. 3.1.5 Hydrocarbons and R-152a shall be identified if either or both are in the refrigerant sample at a percentage of 3% to 10%, accurate to r2% points. For Hydrocarbons or R152a quantities greater than 10%, the RDI shall display the

24、percentage as greater than 10% so as to not impinge upon the prior stated accuracy. The display may read HC/R-152a or an equivalent listed in the instruction manual. 3.2 This document provides the tests the equipment must pass and the feature content it is required to have, to certify the equipment

25、to this standard, for identification of HFC-134a (R-134a), HFO-1234yf (R-1234yf) and hydrocarbons and/or R-152a. However, the equipment may identify as many refrigerants or substances as are in accordance with the manufacturers design. The identifier shall not misidentify (i.e., incorrectly identify

26、 as pure R-134a or R-1234yf) any of the following: CFC-12, R-142b, R-22, R-32, R-124, R-404A and R-410A. 3.2.1 If the equipment displays a percentage beyond the design certified percent purity level (i.e., to one or more decimal places) or identifies refrigerants other than R-1234yf, HFC-134a and hy

27、drocarbons/R-152a, the additional display is understood to be informational and may not be accurate. See 4.5. 3.2.2 To prevent possible refrigerant contamination the equipment shall comply with Federal requirements that a unique separate hose assembly be used with a permanently attached service port

28、 fitting, for each primary refrigerant it will test/identify. The RDI shall be furnished with fittings for R-134a and R-1234yf unless said device is designed for integration into an R/R/R machine. 3.2.3 The equipment shall be certified that it meets this specification by SAE J2911. SAE INTERNATIONAL

29、 J2912 Revised DEC2014 Page 4 of 11 3.3 As an example, for an RDI that meets this specification to identify R134a and R-1234yf by ABC Company, to 98% purity and to detect weight of non-condensable gases 3% or greater, the label (with lettering at least 3 mm high) would read - “Refrigerant Diagnostic

30、 Identifier Design Certified by (name, such as ABC Company or ABC Laboratories) to Meet SAE J2912 to Identify HFC-134a (R-134a) and HFO-1234yf (R-1234yf), to 98% purity.” Also, “This equipment will detect 3% or greater by weight of non-condensable gases in HFC-134a (R-134a) and HFO-1234yf (R-1234yf)

31、.” 3.4 The supplier of an RDI that meets this standard also is permitted to list separately in the operating manual and/or on a separate label, any other refrigerants for which the RDI has similarly been tested and its performance verified to identify to accuracy levels equal to R-134a, R-1234yf and

32、 hydrocarbons/R152a. However, such listings shall be referred to as informational, as no specific testing is required by this standard. The label should include the words “Informational only; not certified to SAE J2912.” 3.4.1 The manufacturer can state certification of compliance with this Standard

33、, including use of any labeling per 3.3, only after meeting the requirements in SAE J2911. SAE J2911 also sets forth the definition of the independent testing laboratory that shall be used, laboratory test technician training requirements, and the Test Verification Table (see Appendix A) that shall

34、be completed. 3.5 The analyzer shall integrate with the SAE J2843 R-1234yf Recovery/Recycling/Recharging Equipment. The R-1234yf Recovery/Recycling/Recharging Equipment may be used as the digital display for the detector or the detector may have its own digital display. The required communication pr

35、otocol is shown in Appendix B. 3.6 The communication of the gas test results between the Analyzer and the SAE J2843 recovery machine shall be encrypted so as to avoid the use of non SAE J2912 certified devices to simulate the test results. The required encryption method is the AES-256 algorithm. 4.

36、OPERATING INSTRUCTIONS 4.1 The equipment manufacturer shall provide operating instructions, including warm-up time (if needed), calibration, parts replacement list, and use instructions. The instructions shall include any other necessary maintenance procedures, source information for replacement par

37、ts and repair, and safety precautions. 4.2 The instructions shall explain that the percent refrigerant purity indicated by this equipment includes the amount of air that may be in the refrigerant being tested, but the percentage of non-condensable gasses (such as air) is an independent number. For e

38、xample, the identifier may indicate 95% refrigerant purity, but the refrigerant may contain 10% air, and both numbers would be displayed, the refrigerant by weight, the non-condensable gasses by weight. The method of determining weight may include an algorithm that uses weight of the same, however.

39、4.3 If the equipment requires special calibration gases, source information, and test facilities, this information shall be included with the operating instructions. Instructions shall clearly indicate calibration frequency intervals to ensure the analyzer maintains its accuracy and sensitivity. 4.4

40、 The instructions shall indicate if the equipment is for use with vapor only or for vapor and liquid. Tests per 5.8 shall be conducted using the correct refrigerant phase as declared by the manufacturer. 4.5 If the accuracy of informational displayed percentages of R-134a or HFO-1234yf (R-12343yf) i

41、s outside of the designed certified purity value required by 3.1.3 and 3.1.4 because the refrigerant sample is identified as contaminated, the following statement shall be published in the manual. “If the refrigerant being tested is identified as contaminated (i.e., less than 98% pure R-1234yf or HF

42、C-134a), any visual percentages displayed of HFC-134a (R-134a) and/or HFO-1234yf (R-1234yf), outside the design certified value is informational and may not be accurate“ or equivalent. Certification for other refrigerant identification in Section 1 shall also comply with this requirement. SAE INTERN

43、ATIONAL J2912 Revised DEC2014 Page 5 of 11 5. EQUIPMENT REQUIREMENTS 5.1 The equipment shall be capable of identifying the specified refrigerants, HFC-134a (R-134a) and HFO-1234yf (R-1234yf), to the specified purity level when evaluated to the test criteria in 5.8. The indication shall be a digital

44、display. No other type of indicator display is acceptable for an RDI certified under this standard. If the equipment has multiple modes of use based on the primary refrigerant being tested, all tests in 5.8 and 5.9 shall be conducted using the correct mode. 5.2 The equipment shall not use more than

45、7 g (0.25 oz.) of refrigerant per test cycle of the refrigerant being identified to perform its functions. 5.3 Equipment shall meet a gas ignition test as follows. The identifier is to be installed in a test chamber at a 49 C ambient. The identifier is to be operated in the normal standby condition

46、and the most easily ignitable mixture of propane and air is to be introduced into the identifier and not into the chamber. The identifier is then to be operated in the signal condition and the input voltage for the test shall be increased to 110% of rated voltage. There shall be no ignition of the g

47、as-air mixture during 10 min of the sample standing in the RDI chamber followed by one operating cycle. The RDI also shall indicate a refrigerant percentage of 100% +0/-2% for hydrocarbons when the operating cycle is completed. 5.4 Electrical components shall meet ANSI/ISA and/or be enclosed/housed

48、in a location within the identifier that will, in case of separation at any connections within the refrigerant sampling flow route, prevent refrigerant from coming into contact with components that may arc/spark during operation and/or reach temperatures in excess of 400 qC (752 qF). 5.5 The RDI sha

49、ll be capable of withstanding without effect on durability and performance, any moisture and oil in the refrigerant sample, by passing the following tests: for moisture: the probe shall be placed and held within 0.2 in (6 mm) of the liquid surface of a pot of vigorously boiling water for 5 min. Immediately following, it shall be tested for accurate identification on a system with 95% R-1234yf, 5% HC and 10% non-condens