GB/T 40233-2021 in English

VALID

Ergonomics of the thermal environment—Instruments for measuring physical quantities

Issued on:2021-05-21
Implemented on:2021-12-01
File Format:PDF
Delivery:Via email within 5 business days

Price(USD)： $630.00
$612.00

Standard No:	GB/T 40233-2021
Document status:	VALID
Title in English:	Ergonomics of the thermal environment—Instruments for measuring physical quantities
Title in Chinese:	热环境的人类工效学物理量测量仪器
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2021-05-21
Implemented on:	2021-12-01
Professional Classification:	GB-National Standard
Related Keywords:	thermal environment instruments turbulent environment instrument selection guide application environmental requirements key differences air temperature ±0.5℃ ± average radiation temperature physical quantities introduction analysis
Related Topics:	measuring instrument Mass calorimeter Efficient Differential Calorimeter Microcalorimeter Ergonomics of Thermal Environment Thermal comfort is analyzed by calculating PMV and PPD indices and local thermal comfort criteria physical quantity Environmental Metrology Handheld Environmental Meter measuring instrument physical measurement measuring instrument: PCR instrument environment Environmental thermal instrument Industrial Environment Measurement tpr Quantum effect tester Environmental Instruments 1 Instrument environment basis There are three types of chemical instruments Physical Properties Instruments Machining Measuring Instruments Measuring instruments and equipment Microcalorimeter Environmental testing of instrumentation physical testing equipment Human calories Detection of environmental instruments Thermal Environment Measuring Instruments Detection of environmental instruments Physiograph human activity environment Measuring Instrument Handling Calorimeters measure heat flux Various environmental monitors physical tester thermodynamic temperature thermal environment Various environmental detectors Instrument working environment Mass + Heat Meter measuring instrument instrument for measuring radiation physical measuring instrument Environmental decibel meter Physical and Chemical Instruments Physical and Chemical Instruments Environmental Measuring Instruments Environmental Measuring Instruments Calorimeter Principle Environmental thermal desorption instrument Engineering Thermophysics instrument for measuring mass Ergonomics An instrument for measuring the content of a substance Calorific value Ergonomics Quantitative calorimeter iso 7730 thermal environment Instrument working environment physical measurement Chemistry third class instrument Three types of chemical instruments "Physical quantity environmental human efficacy Calorimeter Microcalorimeter physical tester Microcalorimeter Heterogeneous environment detection instrument Calorimeter Calorimeter Instruments for testing the environment Calorimeters and Calorimeters Microcalorimeter Quantity measuring instrument Adiabatic Calorimeter Multi-purpose calorimeter GBT40233 GB/T 40233-2021 ergonomic sofa The principle of quantitative loop Classification of chemical instruments Environmental measurement instrument accessories Engineering instrument measurement adk Multifunctional environmental measuring instrument Commonly used measuring instruments in engineering Loop tester principle What is the general heat capacity of a calorimeter? SDACM4000 calorimeter Types of rtk measuring instruments Calorimeter Parr6400 Industrial instrumentation environmental testing Ergonomics Phenolic environmental quality Measuring instrument standards Standard physical quantities Ergonomics Calorimeter test environment requirements gb/t 40233-2021 Measuring instrument standards

《GB/T 40233-2021热环境的人类工效学物理量测量仪器》由TC7（全国人类工效学标准化技术委员会）归口，主管部门为国家标准化管理委员会。

Introduction

Analysis of the core content of the standard

Measurement parameters	Class C environmental requirements	Class S environmental requirements	Key differences
Air temperature	±0.5℃	±(0.5+0.04\|ta\|)℃	Temperature deviation compensation is required in extreme environments
Average radiant temperature	±2℃	±(5+0.08\|tr-50\|)℃	Greater error is allowed in high temperature conditions
Air velocity	±(0.05+0.07va)m/s	±(0.1+0.05va)m/s	Relaxed accuracy in turbulent environment

Instrument Selection Guide

Application of black ball thermometer

The standard recommends using a black ball thermometer with a diameter of 150mm to measure the average radiation temperature. The heat balance equation is:

εσ(T_r⁴-T_g⁴)+h_cg(T_a-T_g)=0

The calculation formula for the h_cg forced convection coefficient is 6.3(v_a^0.6/D^0.4). Please note the impact of diameter changes on the measurement results (see Appendix B).

Key points for implementation

Spatial layout:According to the requirements of Table 5, the measurement height for standing working conditions should be 1.1m (abdomen) and 1.7m (head)
Response time:The black ball thermometer takes 20-30 minutes to reach thermal equilibrium. Continuous recording is recommended
Error control:The dry-bulb and wet-bulb hygrometers must ensure a wind speed of ≥4m/s, and the wet-bulb cotton core should extend 20mm beyond the sensor

Technical evolution analysis

This standard first adopted ISO7726 in 1998. The main updates of the 2021 version are:

Add measurement requirements for asymmetric plane radiation temperature
Refine the measurement tolerance for extreme environments (Class S)
Supplement the surface emissivity correction method for infrared thermometers

More samples: JJG 21-2008 DL/T 5154-2012 JGJ 94-2008

Sample only — not a preview of GB/T 40233-2021

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