Reference conditions and procedures for testing industrial and process measurement transmitters—Part 1: General procedures for all types of transmitters
GB/T 42567.1-2023 Reference conditions and procedures for testing industrial and process measurement transmitters - Part 1 : General procedures for all types of transmitters
1 Scope
This document establishes a general framework for defining reference conditions and test procedures applicable to all types of industrial and process measurement transmitters (PMTs) used in measuring and control systems for industrial process and machinery. These reference test conditions are divided into "standard reference conditions", which apply when determining the accuracy of measurement, and “ambient and process reference conditions”, which are used to assess the influence of external quantities on the measurement.
For the purpose of this document, an analogue PMT is a process measurement transmitter with an analogue current or voltage output, irrespective of the technology adopted and the complexity of the circuitry. All the other process measurement transmitters, with digital output only or with hybrid analogue and digital output (e. g. HARTO), are considered to be digital PMTs.
The general test procedures provided in this document is applicable to all types of industrial and process measurement transmitters.
Additional specific test procedures for given types of PMTs (pressure, temperature, level, flow) are covered by other parts of this series.
Note 1: In industrial and process applications, to indicate the process measurement transmitters it is common also to use the terms "industrial transmitters", or “process transmitters".
Note 2: For better clarity, when the complete definition "industrial and process measurement transmitter" makes the sentence too long in this document, the short term "transmitter" is used instead.
Proximity devices with analogue output are excluded from the scope of this document.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 4208-2017 Degrees of protection provided by enclosure (IP code) (IEC 60529 : 2013, IDT)
GB/T 17214.1-1998 Industrial-process measurement and control equipment - Operating conditions Part 1 : Climatic conditions (IEC 654-1:1993)
GB/T 17214.3-2000 Operating conditions for industrial-process measurement and control equipment - Part 3 : Mechanical influences (IEC 60654-3:1983, IDT)
GB/T 17214.4-2005 Operating conditions for industrial-process measurement and control equipment - Part 4 : Corrosive and erosive influence (IEC 60654-4:1987, IDT)
GB/T 18271.1-2017 Process measurement and control devices - General methods and procedures for evaluating performance - Part 1 : General considerations (IEC 61298-1: 2008, IDT) .
GB/T 18271.4-2017 Process measurement and control devices - General methods and procedures for evaluating performance - Part 4 : Evaluation report content(IEC 61298-4:2008, IDT)
GB/T 20138-2006 Degrees of protection provided by enclosures for electrical equipment against external mechanical impacts (IK code) (IEC 62262:2002, IDT)
GB 28526- 2012 Electrical safety of machinery - Functional safety of safety-related electrical, electronic and programmable electronic control systems (IEC 62061 : 2005, IDT)
ISO/IEC Guide 98-3:2008 [Un-certainty of measurement - Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)]
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
?ISO Online browsing platform: available at https://www.iso.org/obp
?IEC Electropedia : available at http://www.electropedia.org/
3.1.1 Terms related to accuracy
3.1.1.1
accuracy (of a measuring instrument)
quality which characterizes the ability of a measuring instrument to provide an indicated value close to a true value of the measurand
Note 1: This term is used in the "true value" approach.
Note 2: Accuracy is all the better when the indicated value is closer to the corresponding true value.
[Source: GB/T 2900.77-2008, 311-06-08]
3.1.1.2
conformity
ability of a measuring instrument to provide an indication having a specified characteristic
curve which can be linear, logarithmic, parabolic, etc.
3.1.1.3
dead band (dead zone)
finite range of values within which a variation of the input variable does not produce any measurable change in the output variable
Note 1: When this type of characteristic is intentional, it is sometimes called neutral zone.
Note 2: This entry was numbered 351-24-14 in GB/T 2900.56-2008.
Note 3: This value is usually insignificant for the actual instruments.
[Source: IEC 60050-351:2013, 351-45-15, modified: Note 3 added]
3.1.1.4
error
discrepancy between a computed, observed or measured value or condition, and the true, specified or theoretically correct value or condition
Note: An error within a system may be caused by failure of one or more of its components, or by activation of a systematic fault.
[Source: GB/T 2900.99-2016, 192-03-02]
3.1.1.5
hysteresis
phenomenon represented by a characteristic curve which has a branch, called ascending branch, for increasing values of the input variable, and a different branch, called descending branch, for decreasing values of the input variable
Note: The CDD code of this entry tor Electronic Data Exchange is ABB661 and the hysteresis is defined as the difference between consecutive upscale and downscale outputs for any single test cycle at the same input test point.
[Source: IEC 60050-351:2013, 351-45-16, modified: note is added]
3.1.1.6
inaccuracy
maximum positive and negative deviation from the specified characteristic curve observed in testing a device under specified conditions and by a specified procedure
Note: Accuracy is defined in GB/T 2900.77-2008, definition 311-06-08.
[Source: GB/T 18271.1-2017, 3.5]
3.1.1.7
linearity
ability of a measuring instrument to provide an indication having a linear relationship with a defined quantity other than an influence quantity
Note: The method of expression of lack of linearity is different for different kinds of instrument and is established in each particular instance.
[Source: GB/T 2900.77-2008, 311-06-05]
