GB/T 18271.2-2017 PDF English
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Process measurement and control devices -- General methods and procedures for evaluating performance -- Part 2: Tests under reference conditions
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GB/T 18271.2-2017: Process measurement and control devices -- General methods and procedures for evaluating performance -- Part 2: Tests under reference conditions
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT18271.2-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.040.40
N 10
GB/T 18271.2-2017 / IEC 61298-2.2008
Replacing GB/T 18271.2-2000
Process measurement and control devices - General
methods and procedures for evaluating performance -
Part 2.Tests under reference conditions
(IEC 61298-2.2008, IDT)
Issued on. JULY 12, 2017
Implemented on. FEBRUARY 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Accuracy related factors... 10
4.1 Test procedures and precautions... 10
4.2 Specific testing procedures and precautions for the determination of dead band
... 18
5 Dynamic behaviour... 18
5.1 General considerations... 18
5.2 General testing procedures and precautions... 19
5.3 Frequency response... 19
5.4 Step response... 21
6 Functional characteristic... 23
6.1 General... 23
6.2 Input resistance of an electrical device... 23
6.3 Insulation of electrical devices... 24
6.4 Power consumption... 25
6.5 Output ripple of a device with an electrical d.c. output... 26
6.6 Air flow characteristics of a pneumatic device... 26
6.7 Limits of adjustments of lower range value and span... 28
6.8 Switching differential... 29
7 Drift... 29
7.1 Start-up drift... 29
7.2 Long-term drift... 30
Foreword
GB/T 18271 "Process measurement and control devices - General methods
and procedures for evaluating performance" is currently planned to be issued
as follows.
- Part 1.General considerations;
- Part 2.Tests under reference conditions;
- Part 3.Tests for the effects of influence quantities;
- Part 4.Evaluation report content.
This Part is Part 2 of GB/T 18271.
This Part is drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces GB/T 18271.2-2000 "Process measurement and control
devices - General methods and procedures for evaluating performance - Part
2.Tests under reference conditions". Compared with GB/T 18271.2-2000, the
main technical changes of this Part are as follows.
- UPDATE normative references; replace GB/T 17212-1998 with GB/T
2900.56-2008 (see Clause 2; Clause 2 of the 2000 edition);
- Delete the terms "device under test", "set point", "adjustability", "transient
overshoot", and "expected event" and definitions (3.1, 3.6, 3.15, 3.21, 3.22
of the 2000 edition);
- Adjust the term "maximum measured error" to "measured error" (see 3.7;
3.9 of the 2000 edition);
- Modify the definitions of the terms "non-repeatability" and "step response
time" (see 3.10, 3.16; 3.12, 3.19 of the 2000 edition);
- ADD the terms "type test", "performance evaluation", "routine test", and
"sample test" and definitions (see 3.19~3.22);
- ADD the categories of "complete tests" and "simplified tests" to Tables 1
and 2 (see Tables 1 and 2);
- Modify the typical air flow characteristic curve of Figure 6 (see Figure 6 of
the 2000 edition);
- ADD the requirement to verify one-directional drift or random drift to long-
term drift (see 7.2).
This Part, using translation method, is identical to IEC 61298-2.2008 "Process
measurement and control devices - General methods and procedures for
evaluating performance - Part 2.Tests under reference conditions".
China’s documents which have a consistent correspondence with the
international documents normatively referenced in this Part are as follows.
- GB/T 2900.79-2008 Electrotechnical terminology - Electrical and electronic
measurements and measuring instruments - Part 3.Types of electrical
measuring instruments [IEC 60050(300-313).2001, IDT]
- GB/T 2900.89-2012 Electrotechnical terminology - Electrical and electronic
measurements and measuring instruments - Part 2.General terms relating
to electrical measurements [IEC 60050(300-312).2001, IDT]
- GB/T 2900.90-2012 Electrotechnical terminology - Electrical and electronic
measurements and measuring instruments - Part 4.Specific terms
according to the type of instruments [IEC 60050(300-314).2001, IDT]
- GB 4793.1-2007 Safety requirements for electrical equipment for
measurement, control, and laboratory use - Part 1.General requirements
(IEC 61010-1.2001, IDT)
This Part was proposed by China Machinery Industry Federation.
This Part shall be under the jurisdiction of National TC 124 on Industrial Process
Measurement, Control and Automation of SAC (SAC/TC 124).
Drafting organizations of this Part. Shanghai Institute of Process Automation &
Instrumentation, Chongqing Institute of Industrial Automation and
Instrumentation, Southwest University, Shanghai Automation Instrumentation
Co., Ltd.
Main drafters of this Part. Wang Jianing, Liu Qin, Zhou Xuelian, Ni Min.
The previous editions of the standard replaced by this Part were released as
follows.
- GB/T 18271.2-2000.
Process measurement and control devices - General
methods and procedures for evaluating performance -
Part 2.Tests under reference conditions
1 Scope
GB/T 18271 specifies general methods and procedures for conducting tests
and reporting on the functional and performance characteristics of process
measurement and control devices. The tests are applicable to any such devices
characterized by their own specific input and output variables, and by the
specific relationship (transfer function) between the inputs and outputs, and
include analogue and digital devices. For devices that require special tests,
GB/T 18271 should be used, together with any product specific standard
specifying special tests.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 2900.56-2008 Electrotechnical terminology - Control technology (IEC
60050-351.2006, IDT)
3 Terms and definitions
The terms and definitions defined in GB/T 2900.56-2008, GB/T 2900.77-2008,
and IEC 60050 (300) and the following ones apply to this document.
Algebraic difference between the values of the upper and lower limits of the
measuring range.
4 Accuracy related factors
Generally, unless otherwise specified in the test programme, the test for
accuracy related factors shall be carried out with the adjustments set at the
settings A, B, C, D, listed below, and in accordance with Table 1 whenever the
span and/or the lower range value adjustments are adjustable further than the
adjustments for the manufacturing tolerances.
5 Dynamic behaviour
Step tests permit the measurement of the dead time, and give a qualitative
evaluation of the non-linearity of the DUT.
Testing shall be carried out with the span adjusted to the approximate mean of
the maximum and minimum span, and with the lower range value set
approximately at the mid-point of its permissible range of adjustment.
6 Functional characteristic
These tests are simple electrical safety checks. Their inclusion is not intended
as a formal assessment of the safety of the equipment, nor are the required test
results intended as a design specification.
The DUT shall be set up for normal operation. The insulation resistance of each
input and output circuit shall be measured if it is insulated from earth.
7 Drift
The device shall be operated for 30 days and, where practical, a steady input
signal corresponding to 90 % of span shall be maintained. The span should be
adjusted to the approximate mean of the maximum and minimum span, and
with the lower range value set approximately at the mid-point of its permissible
range of adjustment.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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