1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationTransmitters for use in industrial-process control systemsPart 1: Methods for performance evaluationBS EN 60770-1:2011National forewordThis British Standard is the UK implementat
2、ion of EN 60770-1:2011. It is identical to IEC 60770-1:2010. It supersedes BS EN 60770-1:1999 which will be withdrawn on 1 Feburary 2014.The UK participation in its preparation was entrusted by Technical Committee GEL/65, Measurement and control, to Subcommittee GEL/65/2, Elements of systems.A list
3、of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011ISBN 978 0 580 61818 5 ICS 25.040.40Compliance with a British
4、 Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2011.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60770-1:2011EUROPEAN STANDARD EN 60770-1
5、NORME EUROPENNE EUROPISCHE NORM February 2011 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2011 CENELEC - All rights of exploitat
6、ion in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60770-1:2011 E ICS 25.040.40 Supersedes EN 60770-1:1999English version Transmitters for use in industrial-process control systems - Part 1: Methods for performance evaluation (IEC 60770-1:2010) Transmetteurs utiliss
7、 dans les systmes de conduite des processus industriels - Partie 1: Mthodes dvaluation des performances (CEI 60770-1:2010) Messumformer fr industrielle Prozessleittechnik - Teil 1: Methoden fr die Bewertung des Betriebsverhaltens (IEC 60770-1:2010) This European Standard was approved by CENELEC on 2
8、011-01-02. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may b
9、e obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to th
10、e Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania
11、, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 60770-1:2011EN 60770-1:2011 - 2 - Foreword The text of document 65B/656/CDV, future edition 2 of IEC 60770-1, prepared by SC 65B, Devices the temperat
12、ure of the fluid shall be maintained within 2 C of the value specified in order to ensure the correct values of density and viscosity). 5 Analysis and classification of transmitter performance In determining the test programme and test values to be used in the evaluation, the physical and functional
13、 design of transmitter should be taken into account. Guidance on this process can be found in Annex A. BS EN 60770-1:2011 8 60770-1 IEC:2010 6 General testing procedures and precautions For the purpose of this standard, the general testing procedures and precautions (e.g. identification and inspecti
14、on, preparation for the tests, uncertainty of the measuring system, traceability, tapping, setting of adjustments, preconditioning, sequence of tests, interruption and duration of each series of measurements, anomalies and failures during tests, re-start of a test, input/output variable relationship
15、s, error assessment, symbols and units of measurement, etc.) specified in IEC 61298-1 shall be applied. The instrument shall be calibrated by the manufacturer and tested without recalibration. Then additional measurements should be made at the lowest and highest possible span and the remainder of th
16、e tests should be carried out at the mean value. 7 Test procedures and reporting The tests given in Tables 1, 2 and 3 are suitable for industrial process transmitters. If a full evaluation is planned, each applicable test should be conducted. The results should be reported as a percentage of the out
17、put span. Unexpected events, including faults and malfunctions, shall be reported. The test procedures and precautions are described in detail in IEC 61298-2 and IEC 61298-3. Table 1 Tests for all transmitters Designation Notes on test methods and on information to be reported Reference Additional i
18、nformation Accuracy-related factors Checking of calibration made prior to delivery IEC 61298-2 Inaccuracy and measured error Three to five upscale and downscale full-range traverses, measuring at least six points along the scale every nearly 20 %. Compute errors and plot error curves IEC 61298-2 1 2
19、 Non-linearity Non-conformity IEC 61298-2 IEC 61298-2 Hysteresis IEC 61298-2 Non-repeatability IEC 61298-2 Dead band Vary input to obtain detectable output change at 10 %, 50 %, 90 % output. Report the maximum variation of input in % of input span IEC 61298-2 3 Frequency response Apply peak-to-peak
20、amplitude of 20 % of the input span at frequencies required in order to vary dynamic gain from 1 to 0,1 Plot against frequency the gain relative to zero frequency gain; the phase lag between the output and input IEC 61298-2 4 Step response Input steps corresponding to 80 % and 10 % of output span. R
21、ecord the step response time and also the time for the output to reach and remain within 1 % of output span of its steady value (settling time) IEC 61298-2 Start-up drift Output monitored for 4 h after power is switched on IEC 61298-2 BS EN 60770-1:201160770-1 IEC:2010 9 Designation Notes on test me
22、thods and on information to be reported Reference Additional information Long-term drift Output monitored for 30 days with an input of 90 % of the span IEC 61298-2 5 Effects of influence quantities Ambient temperature Two or three cycles of the temperature range specified IEC 61298-3 6 Humidity One
23、cycle at 40 C; 93 % HR IEC 61298-3 Vibration (sinusoidal) Initial resonance search, endurance conditioning over 60 sweep cycles, and final resonance search IEC 61298-3 Shock “Drop and topple“ procedure in accordance with IEC 60068-2-31 IEC 61298-3 Mounting position 10 inclination in two ortogonal pl
24、anes IEC 61298-3 7 Overrange Overrange of 50% of the sensor upper range limit for 1 min. Measure 5 min after return to a value within the normal range For differential pressure transmitters, carry out with the line pressure on both of the inputs in turn IEC 61298-3 Temperature of process fluid Stead
25、y-state changes at 10 % and 90 % of the input span IEC 61298-3 Only when effect is significant Flow of process fluid through the transmitter (other than flow transmitter) Change of output at 10 % and 90 % of the input span IEC 61298-3 Only if applicable, e.g. when for normal operation process fluid
26、flows through part of the transmitter Static line pressure effect Change of output at 10 % and 90 % of the input span at each 25 % increment of the static pressure, if applicable. Where not applicable the test shall be performed at least measuring the change of output 0 for 0 differential pressure i
27、nput IEC 61298-3 Only for differential pressure transmitters Flow of purge gas through the transmitter Change at 10 % and 90 % of the output with purge flow to 0 %, 50 % and 100 % of the maximum specified (if applicable) IEC 61298-3 Accelerated life 100 000 cycles of amplitude equal to half the span
28、. Measure lower range value, span and hysteresis at start and finish of test. Additional measurements during the test may be required if wear or ageing is anticipated IEC 61298-3 1For transmitters with analogue output, which include smart options, the adjustment of zero and span can be obtained eith
29、er locally or by remote device (e.g. computer, hand terminal). These instruments may be equipped with facilities for “blind calibration”. In this case no accurate test device is needed for the adjustment of zero and span. For this type of transmitter, some manufacturers specify also the inaccuracy o
30、f the transmitter after the blind calibration. This type of inaccuracy may differ from the inaccuracy of an instrument calibrated against a standard test device. It can be considered as a new function to be evaluated. 2For the purpose of this test and unless otherwise specified for a particular type
31、 of transmitter, the measurement cycles shall be at least three but preferably five and the test points six (0 %, 20 %, 40 %, 60 %, 80 %, 100 % input span) or eleven (0 %, 10 %, 20 %, 30 %, 40 %, 50 %, 60 %, 70 %, 80 %, 90 %, 100 % input span). For instruments with a non-linear input-output relation
32、ship (e.g. square law), the test points should be chosen so as to obtain output values equally distributed over the output span. 3Unless the dead band is known to be insignificant, it shall be measured at 10 %, 50 % and 90 % of the span, proceeding as follows: a) set the input at the first test poin
33、t (e.g. 10 %); b) note the input value; c) slowly increase the input variable to the transmitter until a detectable output change is observed; BS EN 60770-1:2011 10 60770-1 IEC:2010 Designation Notes on test methods and on information to be reported Reference Additional information d) note the input
34、 value and repeat the operation in the opposite direction as specified in IEC 61298-2. The increment through which the input signal is varied (difference between d) and b) above), is the dead band at this point. Repeat steps c) and d), slowly increasing the input again until a detectable output chan
35、ge is observed and noting the input value: the increments shall be observed and recorded at least three times, and preferably five times, at each of three test points close to 10 %, 50 % and 90 % of the span, over a full-range traverse. This procedure shall be repeated, at each of the three test poi
36、nts (close to 90 %, 50 % and 10 % of span), decreasing the input variable starting from 90 % of the span. 4If it is not practicable to generate a sinusoidal signal to be applied to the input of certain transmitters, (flow, integrally mounted sensor transmitters, etc.) this test should not be perform
37、ed. For pneumatic transmitters, unless otherwise specified, a test load consisting of an 8 m long rigid pipe with a 4 mm internal diameter, followed by a 20 cm3capacity, shall be used. Lower amplitudes may be necessary to investigate the full bandwidth capability. 5Where practicable, the data should
38、 be measured each day and processed to determine a best fit straight line and verify if there is a drift in one direction or a random drift. 6For further information on test temperature procedures, see IEC 60068-2-1 and IEC 60068-2-2. 7For pressure transmitters the test shall be executed on the two
39、ortogonal planes of the primary pressure element with 180 respect nominal mounting position or within the limits specified by the manufacturer. Table 2 Additional tests for electrically powered transmitters Designation Notes on test methods and on information to be reported Reference Additional info
40、rmation Input resistance of a transmitter with electrical inputs Resistance presented to d.c. input signals at the input terminals, expressed in IEC 61298-2 1 Insulation resistance Insulation resistance to earth or to the case of each circuit at 500 V d.c. for 30 s, expressed in IEC 61298-2 Dielectr
41、ic strength The r.m.s. test voltage (mains frequency) specified shall not result in breakdown or flashover IEC 61298-2 Power consumption Load at maximum supply voltage and minimum frequency specified by manufacturer (in W and VA) IEC 61298-2 Output ripple Peak-to-peak values and principle frequency
42、components IEC 61298-2 Output load Vary load resistance from minimum to maximum as specified by manufacturer IEC 61298-3 2 Source impedance Vary input circuit resistance from minimum to maximum values specified by manufacturer 3 Supply voltage and frequency variations Nine sets of measurements for v
43、ariations in a.c. voltage and frequency For transmitters using a d.c. mains supply, three sets are required For two-wire transmitters (loop powered) measure the minimum voltage that is required to sustain the 20 mA output current IEC 61298-3 4 Supply voltage depressions At 75 % of nominal supply vol
44、tage for 5 s. Report the effect on the output signal and its duration. Voltage dips for up to 100 ms may also need to be investigated IEC 61298-3 4 BS EN 60770-1:201160770-1 IEC:2010 11 Designation Notes on test methods and on information to be reported Reference Additional information Short-term su
45、pply voltage interruptions Repeated interruptions at crossover point of 1, 5, 10, 25 cycles for a.c. supply; 5, 20, 100, 200 and 500 ms for d.c. supply. Report the peak positive and negative and the time required to stabilise IEC 61298-3 4 5 Reverse supply voltage protection IEC 61298-3 Common mode
46、interference For transmitters with terminals isolated from earth 250 V r.m.s., a.c. at mains frequency superimposed on isolated terminals Then positive and negative 50 V d.c. superimposed on isolated terminals IEC 61298-3 6 Normal mode interference (series mode) 1 V or less, at mains frequency and 1
47、0 % and 90 % of the output span IEC 61298-3 Earthing Only for transmitters with isolated terminals. Record transients and changes of output IEC 61298-3 Electrical fast transients (bursts) Test voltage specified or 2 kV peak IEC 61298-3 7 Surge voltage immunity Test voltage specified in the product s
48、tandard or by user. Commonly used maximum values are 2 kV peak (asymmetric) and 1 kV peak (symmetric) IEC 61298-3 8 Damped oscillatory waves Test voltage specified or 0,5 kV peak at 1 MHz 9 Conducted sine-wave RF-disturbances Test voltage specified or 10 V r.m.s. from 0,15 MHz to 80 MHz 10 Electrost
49、atic discharge Test voltage specified or 6 kV (contact), 8 kV (air) IEC 61298-3 11 Power frequency magnetic field Continuous: 100 A/m (unless higher values are agreed) at 10 % and 90 % of the output span Short duration: 400 A/m for 1 s at 50 % output span IEC 61298-3 12 Damped oscillatory magnetic field Value of field specified or 30 A/m at 0,1 MHz and 1,0 MHz 13 Radiated, radio-frequency electromagnetic field Value of field specified or 10 V/m from 80 MHz to 1 GHz IEC 6
