1、 AMERICAN NATIONAL STANDARD ANSI/ISA-75.13.01-2013 Method of Evaluating the Performance of Positioners with Analog Input Signals and Pneumatic Output Approved 2 December 2013 ANSI/ISA-75.13.01-2013, Method of Evaluating the Performance of Positioners with Analog Input Signals and Pneumatic Output IS
2、BN: 978-0-876640-51-7 Copyright 2013 by ISA. All rights reserved. Not for resale. Printed in the United States of America. 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 other
3、wise), without the prior written permission of the Publisher. ISA 67 Alexander Drive P.O. Box 12277 Research Triangle Park, North Carolina 27709 3 ANSI/ISA-75.13.01-2013 Preface This preface, as well as all footnotes and annexes, is included for information purposes and is not part of ANSI/ISA-75.13
4、.01-2013. This document has been prepared as part of the service of ISA towards a goal of uniformity in the field of instrumentation. To be of real value, this document should not be static but should be subject to periodic review. Toward this end, the Society welcomes all comments and criticisms an
5、d asks that they be addressed to the Secretary, Standards and Practices Board; ISA; 67 Alexander Drive; P. O. Box 12277; Research Triangle Park, NC 27709; Telephone (919) 549-8411; Fax (919) 549-8288; E-mail: standardsisa.org. The ISA Standards and Practices Department is aware of the growing need f
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17、CES BEFORE IMPLEMENTING THIS DOCUMENT. THE USER OF THIS DOCUMENT SHOULD BE AWARE THAT THIS DOCUMENT MAY BE IMPACTED BY ELECTRONIC SECURITY ISSUES. THE COMMITTEE HAS NOT YET ADDRESSED THE POTENTIAL ISSUES IN THIS VERSION. The following members of ISA Subcommittee ISA75.13 approved this standard: NAME
18、 COMPANY R. Duimstra, Chair Fisher Controls International LLC W. Weidman, Managing Director WCW Consulting S. Boyle Metso Automation USA Inc. T. George Richards Industries J. Kiesbauer Samson Aktiengesellschaft J. McCaskill Expro Group V. Mezzano Fluor Corporation L. Ormanoski Consultant J. Young Th
19、e Dow Chemical Company The following members of ISA Committee ISA75 approved this standard: NAME COMPANY J. Young, Chair The Dow Chemical Company W. Weidman, Managing Director WCW Consulting A. Abromaitis S 23 ANSI/ISA-75.13.01-2013 b) erratic output 5 percent of output span; c) major calibration sh
20、ifts 5 percent of output span; or d) structural failure, broken, or loosened parts. 5.3.6 Electromagnetic susceptibility Positioners with torque motors and voice coils are not affected by radio frequency interference (RFI), and the following tests are not required. 5.3.6.1 The purpose of this test i
21、s to evaluate the performance of electropneumatic positioners when subjected to electromagnetic fields, such as those generated by portable radio transceivers or other devices that generate continuous, wave-radiated electromagnetic energy. 5.3.6.2 The procedure defined herein requires the generation
22、 of electromagnetic fields within which the test sample is placed, and its operation is observed. To generate fields that are useful for simulation of actual (field) conditions, significant antenna drive power and the resultant high-field strength levels may be required. To comply with the Federal C
23、ommunication Commissions regulations and to prevent biological hazards to the testing personnel, it is recommended that these tests be performed in a shielded enclosure or room. 5.3.6.3 The use of a shielded enclosure, however, creates difficulties in establishing and maintaining the required field
24、strengths due to reflections of the radiated energy from the walls of the enclosure. These reflections will cause reinforcement and cancellation nodes to be established within the room. 5.3.6.4 A specific ground plane is not required. When a means is required to support the test sample, it should be
25、 constructed of nonmetallic material. However, grounding of the housing or of the case of the instrument shall be consistent with the manufacturers installation recommendations. 5.3.6.5 The following test equipment is recommended. The use of other means of establishing and controlling the field is n
26、ot ruled out and is acceptable, providing the required conditions can be verified. a) Shielded room size adequate to maintain distances shown by Figure 5 b) Signal source signal generator(s) capable of covering frequency range, with capability of amplitude modulation (if automatic sweep, sweep rate
27、should be capable of achieving 1.5 x 10-3 decades per second, or slower) c) Power amplifier to amplify the signal and provide antenna drive if the signal source is incapable of doing so d) Antennas signal source 1) Biconical reference manufacturers specifications 2) Conical logarithmic spiral refere
28、nce manufacturers specifications e) Field strength monitor antennas with EMI (electromagnetic interference) meter f) Associated equipment to monitor output and to establish operating power and signals for test sample 5.3.6.6 The test procedure assumes the use of biconical and log spiral antennas. Ot
29、her methods of establishing the fields are acceptable, providing the proper fields can be generated and verified. Tests ANSI/ISA-75.13.01-2013 - 24 - shall be conducted with a field strength of 10 V/m over a frequency range of 20 MHz to 1000 MHz. 5.3.6.7 Basic radiation susceptibility test The basic
30、 radiation susceptibility test is as follows: a) Mount the positioner and the transmitting antenna in accordance with the distance restrictions of Figure 5 for the biconical and log spiral antennas. When using the biconical transmitting antenna, adjust it so that the electromagnetic field is polariz
31、ed vertically. b) Establish the field strength of 10 V/m from 20 MHz to 1000 MHz by replacing the positioner with the EMI receiver antenna. c) Replace the receiving antenna with the positioner and sweep through the required frequency band. Maintain the input signal at the 50 percent value. Record th
32、e travel versus the radiation frequency. Automatic sweep rate will be at 1.5 x 10-3 decades or less per second. If annual sweep is utilized, data points should be taken at a rate of ten (10) frequencies per decade. For frequencies below 50 MHz, the test shall be conducted with amplitude modulation o
33、f 90 percent with a 1000 Hz sine wave. (See 5.3.6.8 for digital equipment.) d) Step 3 shall be repeated to expose the positioner on all six sides. e) If a polarized signal is used, change electromagnetic wave polarization to horizontal and repeat Steps 2, 3, and 4. Figure 5 Test arrangement for elec
34、tromagnetic susceptibility 25 ANSI/ISA-75.13.01-2013 5.3.6.8 Digital equipment modulation test All digital equipment using a clock shall also be subjected to electromagnetic radiation that is 90 percent amplitude (pulse or square wave) modulated at a frequency close to 10 kHz, but not phase-locked w
35、ith the digital clock frequency. The 1000 Hz sine wave modulation listed in Step 3 of 5.3.6.7 may be omitted when the 10 kHz modulation test is performed. 5.3.6.9 Keying test Some equipment is susceptible to repeated operation of a transmitter. This test is to evaluate the instrument in this mode. T
36、o simulate keying of a transceiver, the signal source shall be switched between 0 and 100 percent of the continuous-wave amplitude as defined by 5.3.6.7, Step 3. The switch signal shall have an “on“ and “off“ duration of at least one second each and shall have rise and fall times of no greater than
37、50 s. There shall be at least ten keying cycles per frequency decade. If manual sweep is utilized, the test shall be run at ten frequencies per decade. Exposure shall be to the most susceptible side of the instrument, as identified by 5.3.6.7, Step 4. 5.3.6.10 Electromagnetic susceptibility shall be
38、 reported as the maximum shift in percentage of output span. EXAMPLE: Electromagnetic susceptibility is 0.25 percent of output span at 10 V/m (10 V/3.28 ft) at frequencies of 20 to 1000 MHz. 5.3.7 Normal mode interference influence (electropneumatic positioners only) This test determines the effect
39、of a form of interference that appears between the input terminals of an electropneumatic positioner. 5.3.7.1 The test circuit of Figure 6 shall be connected to the input terminals of the electropneumatic positioner with the isolation switch open. 5.3.7.2 Maintain test conditions and precondition th
40、e positioner/actuator assembly as indicated in Clause 4. Observe and record actuator travel for one full-range six-point traverse in both directions. ANSI/ISA-75.13.01-2013 - 26 - Positioner Case Connection Figure 6 Test circuit for normal mode interference influence 5.3.7.3 The input to the positio
41、ner shall be set at 50 percent span, and the isolation switch shall be closed. Normal mode interference shall be artificially introduced by applying a voltage of operating-power supply frequency between the input circuit terminals of the positioner. The rms magnitude of the normal mode interference
42、shall be adjusted to the manufacturers stated value for extreme operating conditions. 5.3.7.4 A slow sweep over the range of 0 to 360 phase angle shall be made. The sweep shall be at a rate not to exceed 4/min. During the sweep, constant monitoring of actuator travel shall be made to detect changes
43、in travel or oscillations. The principal phase angles where a major effect was identified shall be noted. 5.3.7.5 The phase angle shall then be set at the principal angle(s) that had the most significant effect on actuator travel. A full-range six-point traverse in both directions and a check of dea
44、d band shall be made while this phase angle is maintained (see 5.2.2). 27 ANSI/ISA-75.13.01-2013 5.3.7.6 Normal mode interference influence shall be reported as shift in percentage of travel span. 5.3.8 Common mode interference influence (electropneumatic positioners only) This test determines the e
45、ffect of a form of interference that appears between the input terminals of an electropneumatic positioner and ground. 5.3.8.1 The test circuit of Figure 7 shall be connected to the input terminals of the electropneumatic positioner with the isolation switch open. 5.3.8.2 Maintain test conditions an
46、d precondition the positioner/actuator assembly as indicated in Clause 4. Observe and record actuator travel for one full-range, six-point traverse in both directions. 5.3.8.3 The input to the positioner shall be set at 50 percent span, and the isolation switch shall be closed. The selector switch s
47、hall be placed in Position 1, and the common mode interference shall be artificially introduced by applying a voltage of operating-power supply frequency between the positioner input terminal connected to the selector switchs Position 1 and the positioner case. The rms magnitude of the common mode i
48、nterference shall be adjusted to the manufacturers stated value for extreme operating conditions. 5.3.8.4 A sweep over the range of 0 to 360 phase angle shall be made at a rate not to exceed 4/min. During the sweep, constant monitoring of actuator travel shall be made to detect changes in travel or
49、oscillations. The principal phase angles where significant effects were identified shall be noted. 5.3.8.5 The phase angle shall then be set at the principal angle(s) that had the most significant effect on actuator travel. A full-range, six-point traverse in both directions and a check of dead band shall be made while this phase angle is maintained (see 5.2.2). 5.3.8.6 Repeat Steps 5.3.8.3 through 5.3.8.5 with the selector switch set in Position 2. 5.3.8.7 Common mode interference influence shall be reported as “shift in percent of trav
