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GB/T 42567.4-2025Reference conditions and procedures for testing industrial and process measurement transmitters - Part 4: Specific procedures for level transmitters (English PDF)

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

January 24, 2025

Implementation date

August 1, 2025

Scope

GB/T 42567.4-2025 (Reference conditions and procedures for testing industrial and process measurement transmitters - Part 4: Specific procedures for level transmitters) is available as an English-translated PDF.

GB/T 42567.4-2025 — This document specifies specific test specifications for process level transmitters used in measurement and control systems in industrial processes and machine control systems.

For general test procedures, please refer to GB/T 42567.1-2023, which is applicable to all types of industrial process measurement transmitters. In this document, the term "industrial transmitter" covers all types of transmitters used in measurement and control systems of industrial processes and machinery.

Transmitter. The requirements of this document apply to all level measurement principles. This document gives a detailed description of level transmitters with two main measuring principles.

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Document preview — GB/T 42567.4-2025

National Standard of the People's Republic of China

ICS: 25.040
Classification: N 18

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
Introduction
1 Scope
2 Normative references
3 Terms and Definitions
3.1 Basic Definition
3.2 Definition of level transmitter
3.2.2 Definition of pressure-based level transmitter
3.2.4 Definition of float level transmitter
3.2.6 Definition of microwave/radar level transmitter
3.2.7 Definition of optical level transmitter
3.2.9 Definition of Capacitance and Admittance Level Transmitters
3.2.10 Definition of mechanical level transmitter
3.2.11 Definition of resistance level transmitter
3.3 Measurement parameters
3.4 Definition of influence quantity
3.5 Reference to the Common Data Dictionary (CDD)
4 Overview of the main level transmitter types
4.1 Overview
4.2 Pressure-based level transmitters
4.3 Microwave/radar level transmitter
4.3.1 Overview
4.3.2 Free space radar level transmitter
4.3.3 Guided wave radar level transmitter
5 Reference test conditions
5.1 Overview
5.2 Standard reference test conditions
5.2.1 Overview
5.2.2 Environmental test conditions
5.2.3 Power supply conditions
5.2.4 Load conditions
5.2.5 Test installation location
5.3 Reference test conditions for environmental and process influencing quantities
5.3.1 General
5.3.2 Process conditions
5.3.3 Ambient atmospheric conditions
5.3.4 Mechanical vibration
5.3.5 Impact, drop and tipping
5.3.6 Power supply
5.3.7 Electromagnetic compatibility (EMC)
5.4 Reference design criteria
5.4.1 Overview
5.4.2 Enclosure protection against solid objects, liquids (IP) and impacts (IK)
5.4.3 Protection of enclosures against corrosion and erosion
5.4.4 Electrical safety (insulation resistance, dielectric strength)
5.4.5 Hazardous environment (for explosive environment)
5.4.6 Functional safety
6 Test Procedure
6.1 General requirements
6.1.1 General
6.1.2 Specific test setup and procedures
6.2 Type test under standard reference test conditions
6.2.1 General
6.2.2 Accuracy and related factors
6.2.3 Static characteristics
6.2.4 Dynamic characteristics
6.3 Type test under working reference test conditions
6.3.1 General
6.3.2 Impact of ambient temperature
6.3.3 Effect of relative humidity
6.3.4 Impact of vibration
6.3.5 Impact, drop and tipping
6.3.6 Accelerated life test
6.3.7 EMC test
6.3.8 Attachment test procedure
6.3.9 Additional tests for digital transmitters
6.4 Routine test
6.5 Acceptance, integration, periodic and maintenance testing
6.5.1 Overview
6.5.2 Periodic verification
6.5.3 Periodic calibration
7 Test reports and technical documents
7.1 Test report
7.2 Technical Documentation
7.3 Total Probability Error (TPE)
7.3.1 Overview
7.3.2 Specific error
Appendix A (Informative) Main characteristics of level transmitter
A.1 Characteristics of level transmitters
A.1.1 Overview
A.1.2 Pressure-based level transmitters
A.1.3 Microwave/radar level transmitter
A.2 Product attributes
A.2.1 Attribute library used in device class
A.2.2 Attribute value list
Appendix B (informative) Example of TPE calculation based on 7.3 and MRU and MRE
B.1 Overview of parameters used for error calculation
B.2 Example of a test report for a pressure-based level transmitter
B.2.1 Overview
B.2.2 Test protocol
B.2.3 DUT characteristics
B.2.4 TPE calculation
B.2.5 MRU calculation
B.3 Subtest process
B.3.1 Inaccuracy test
B.3.2 Ambient temperature effect test
B.3.3 Process temperature effect test
B.3.4 Long-term stability test
References
Figure 1 Schematic diagram of time value and its meaning
Figure 2 Principle of pressure-based level transmitter
Figure 3 Free space radar level transmitter
Figure 4 Guided wave radar level transmitter
Figure 5 Schematic diagram of the pressure PMT (transmitter) test setup
Figure 6 Typical test setup for radar level transmitter
Figure 7 Experimental configuration for simulating targets and environments
Figure 8 Example of test configuration for wet test
Table 1 Environmental test conditions
Table 2 Influence of various level measurement principles
Table 3 Number of test cycles, number of test points and test points 16
Table 4 Example of maximum error statement
Table A.1 Pressure-based level transmitter
Table A.2 Free space radar level transmitter
Table A.3 Guided wave radar level transmitter
Table A.4 Attribute library used in device class
Table A.5 Attribute value list
Table B.1 Abbreviations
Table B.2 DUT characteristics
Table B.3 TPE calculation
Table B.4 MRU calculation
Table B.5 Reference test equipment for inaccuracy test
Table B.6 Reference test conditions for inaccuracy test
Table B.7 Test results of inaccuracy test
Table B.8 Reference test equipment for ambient temperature influence test
Table B.9 Reference test conditions for ambient temperature effect test
Table B.10 Test results of ambient temperature effect test
Table B.11 Reference test equipment for process temperature effect test
Table B.12 Reference test conditions for process temperature effect test
Table B.13 Test results of process temperature effect test
Table B.14 Reference test equipment for long-term stability test
Table B.15 Reference test conditions for long-term stability test
Table B.16 Test results of long-term stability test

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is part 4 of GB/T 42567 "Reference conditions and procedures for testing industrial process measurement transmitters".

The following parts have been published.

--- Part 1: Common procedures for all types of transmitters;

--- Part 2: Specific procedures for pressure transmitters;

--- Part 3: Specific procedures for temperature transmitters;

--- Part 4: Specific procedures for level transmitters;

--- Part 5: Specific procedures for flow transmitters.

This document is equivalent to IEC 62828-4:2020 "Reference conditions and procedures for testing industrial process measurement transmitters Part 4: Level Transmitter Specific Procedures.

Introduction

Most of the current standards for industrial process measurement transmitters are relatively old and are based on analog transmitters.

Many industrial process measurement transmitters are also evolving and are very different from analog transmitters. they are usually digital and have a (mainly digital electronic circuits) and the measurement part (mainly mechanical structure), both include more functions and newer interfaces.

There are some standards related to digital transmitters for process measurements, but suitable test methods for some performance aspects are still lacking.

The existing test standards for industrial process measurement transmitters are scattered documents, so it is difficult for manufacturers and users to identify and select it is difficult, impractical and time consuming to select all transmitter standards for measuring a specific process quantity (pressure, temperature, flow, level, etc.).

In order to solve the above problems and better serve manufacturers and users, the GB/T 42567 series of standards is designed to provide different types of industrial processes.

The test method is systematically provided for the process measurement transmitter, which is composed of the following five parts.

--- Part 1: Common procedures for all types of transmitters. The purpose is to provide all types of transmitters used provide reference conditions and a procedural framework for the tests.

--- Part 2: Specific procedures for pressure transmitters. Intended for use in measurement and control systems in industrial processes and machinery the pressure transmitter provides reference conditions and procedures for specific tests.

--- Part 3: Specific procedures for temperature transmitters. Intended for use in measurement and control systems in industrial processes and machinery the temperature transmitter provides reference conditions and procedures for specific tests.

--- Part 4: Specific procedures for level transmitters. Intended for use in measurement and control systems in industrial processes and machinery the level transmitter provides specific test reference conditions and procedures.

--- Part 5: Specific procedures for flow transmitters. Intended for use in measurement and control systems in industrial processes and machinery the flow transmitter provides reference conditions and procedures for specific tests.

In the process of formulating the GB/T 42567 series of standards, GB/T 18271 "General performance evaluation of process measurement and control equipment" was adopted.

Many test procedures in the "Standardized Methods and Procedures" were revised and necessary improvements were made.

Reference conditions and test conditions for industrial process measurement transmitters Procedures Part 4: Specific procedures for level transmitters

1 Scope

This document specifies specific test specifications for process level transmitters used in measurement and control systems in industrial processes and machine control systems.

For general test procedures, please refer to GB/T 42567.1-2023, which is applicable to all types of industrial process measurement transmitters.

In this document, the term "industrial transmitter" covers all types of transmitters used in measurement and control systems of industrial processes and machinery.

Transmitter.

The requirements of this document apply to all level measurement principles.

This document gives a detailed description of level transmitters with two main measuring principles.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 2423.5-2019 Environmental testing Part 2: Test method Test Ea and guidance. Shock (IEC 60068-2-27:2008, IDT) GB/T 2423.10-2019 Environmental testing Part 2: Test method Test Fc. Vibration (sinusoidal) (IEC 60068-2-6:2007, IDT) GB/T 2423.56-2023 Environmental testing Part 2: Test method Test Fh. Broadband random vibration and guidance (IEC 60068-2-64:2019,IDT) GB/T 42567.1-2023 Reference conditions and procedures for testing industrial process measurement transmitters Part 1: All types of transmitters Common procedures (IEC 62828-1:2017, IDT) GB/T 42567.2-2023 Reference conditions and procedures for testing industrial process measurement transmitters Part 2: Characteristics of pressure transmitters Specific procedures (IEC 62828-2:2017, IDT) IEC 61326-2-3:2012 Electromagnetic compatibility requirements for electrical equipment for measurement, control and laboratory use Part 2-3.Particular requirements signalconditioning) Note. GB/T 18268.23-2010 Electromagnetic compatibility requirements for electrical equipment for measurement, control and laboratory use Part 23: Special requirements for integrated or Test configuration, operating conditions and performance criteria for remote signal conditioning transmitters (IEC 61326-2-3:2006, IDT)

3 Terms and definitions

The terms and definitions defined in GB/T 42567.1-2023 and the following apply to this document.

The URLs for terminology databases used for standardization maintained by ISO and IEC are as follows.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 49 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 60068 · IEC 62828 · IEC 61326

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