GBZ/T 189.8-2007 PDF in English
GBZ/T 189.8-2007 (GBZ/T189.8-2007, GBZT 189.8-2007, GBZT189.8-2007)
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Measurement of physical agents in workplace -- Part 8: Noise
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GBZ/T 189.8-2007: PDF in English (GBZT 189.8-2007) GBZ/T 189.8-2007
GBZ
OCCUPATIONAL HYGIENIC STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 13.100
C 52
Measurement of physical agents in workplace - Part 8: Noise
ISSUED ON: APRIL 12, 2007
IMPLEMENTED ON: NOVEMBER 01, 2007
Issued by: Ministry of Health of PRC
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Measuring instruments ... 5
3 Measurement method ... 5
4 Measurement records ... 8
5 Precautions ... 8
Appendix A (Informative) Sampling method using personal noise dosimeters ... 9
Appendix B (Informative) Reference exposure limits of noise equivalent sound level in
workplaces ... 10
Foreword
GBZ/T 189 "Measurement of physical agents in workplace" is divided into the
following parts:
- Part 1: Ultra high frequency radiation;
- Part 2: High frequency electromagnetic field;
- Part 3: Power frequency electric field;
- Part 4: Laser radiation;
- Part 5: Microwave radiation;
- Part 6: Ultraviolet radiation;
- Part 7: High stress;
- Part 8: Noise;
- Part 9: Hand-transmitted vibration;
- Part 10: Classification of physical workload;
- Part 11: Heart rate on physical work.
This Part is Part 8 of GBZ/T 189.
This Part of GBZ/T 189 was revised in accordance with WS/T 69-1996 "Directive rules
for noise measurement in the work environment".
Compared with WS/T 69-1996 on measurement methods, the main revisions of this
Part are as follows:
- INCORPORATE the measurement series of physical factors in the workplace;
- STANDARDIZE the scope of use, requirements for measuring instruments,
measurement methods;
- ADD the calculation methods for steady-state and unsteady-state noise, 8h
equivalent sound level, 40h equivalent sound level;
- ADOPT the personal noise dosimeters; PROVIDE the sampling methods using
personal noise dosimeters.
Appendix A and Appendix B of this Part are informative appendixes.
Measurement of physical agents in workplace - Part 8: Noise
1 Scope
This Part of GBZ/T 189 specifies the measurement methods for productive noise in
workplaces.
This Part applies to the measurement of productive noise in the workplace.
2 Measuring instruments
2.1 Sound level meter: Type 2 or above, with A-weighting, "S (slow)" gear.
2.2 Integrating sound level meter or personal noise dosimeter: Type 2 or above, with A-
weighting, C-weighting, "S (slow)" gear and "Peak (peak)" gear.
3 Measurement method
3.1 On-site investigation
In order to correctly select the measurement point, measurement method, measurement
time, etc., it is necessary to conduct an on-site investigation of the workplace, before
the measurement. The investigation contents mainly include:
3.1.1 Draw a sketch for the area, space, process division, noise equipment layout, etc.
of the workplace.
3.1.2 Division of work flow, noise characteristics of each production procedure, noise
change law, etc.
3.1.3 Pre-measurement, to determine whether the noise is stable and whether the
distribution is uniform.
3.1.4 Number of staff, working routes, working methods, stay time, etc.
3.2 Preparation of measuring instruments
3.2.1 Selection of measuring instruments: Sound level meters are used for fixed job
positions; individual noise dosimeters are preferred for mobile jobs, OR sound level
meters are used for different workplaces, to measure separately and calculate the
equivalent sound level.
3.2.2 The measuring instrument shall be calibrated, according to the instrument
calibration requirements, before measurement.
3.2.3 Integral sound level meter or personal noise dosimeter is set to A-weighting, "S
(slow)" gear; the value is sound level LpA or equivalent sound level LAeq. When
measuring impulse noise, use "Peak (peak value)" gear.
3.3 Measuring point selection
3.3.1 When the sound field in the workplace is evenly distributed [A sound level
difference within the measurement range is less than 3 dB(A)], select 3 measuring
points; take the average value.
3.3.2 When the sound field distribution in the workplace is uneven, it shall be divided
into several sound level areas; the sound level difference within the same sound level
area is < 3 dB(A). In each area, select 2 measuring points; take the average value.
3.3.3 Workers are mobile. Within the mobile range, make measurements at the
workplaces respectively; calculate the equivalent sound level.
3.3.4 Refer to Appendix A, for the sampling method using personal noise dosimeters.
3.4 Measurement
3.4.1 The microphone shall be placed at the height of the ears of the workers, when they
are working, 1.50 m for standing gesture and 1.10 m for sitting gesture.
3.4.2 The direction of the microphone is pointing to the sound source.
3.4.3 The measuring instrument is fixed on a tripod and placed at the measuring point;
if the tripod is not suitable for placement on site, the sound level meter can be held by
hand; however, the distance between the tester and the microphone shall be kept > 0.5
m.
3.4.4 For workplaces with steady-state noise, make 3 measurements at each measuring
point; take the average value.
3.4.5 For workplaces with unsteady noise, determine the time period, according to the
sound level change (sound level fluctuation ≥ 3 dB); measure the equivalent sound level
of each time period; record the duration of each time period.
3.4.6 When measuring impulse noise, it shall measure the peak value of impulse noise
and the number of impulses in a working day.
3.4.7 Measurements shall be carried out under normal production conditions. When the
wind speed in the workplace exceeds 3 m/s, the microphone shall wear a windshield.
Electromagnetic field interference shall be avoided, as much as possible.
Where:
LEX,W - Refers to the average weekly exposure value (A-weighted), in decibels (dB);
LEX,8h - The equivalent sound level (A-weighted) of exposure noise intensity, which
is normalized to 8 hours of work during the actual working time of a day, in decibels
(dB);
n - Refers to the actual number of working days per week, in days (d).
3.5.4 Impulse noise: Using the integral sound level meter, "Peak (peak value)" gear, it
can directly read the peak value of the sound level Lpeak.
4 Measurement records
The measurement records shall include the following contents: measurement date,
measurement time, meteorological conditions (temperature, relative humidity),
measurement location (organization, factory & mine name, workshop and specific
measurement location), type and parameters of the equipment under test, type of
measurement instrument, measurement data, surveyors, time records, etc.
5 Precautions
During on-site measurement, the measurement personnel shall pay attention to personal
protection.
According to the principle that the exposure time is halved and the noise exposure limit
value is increased by 3 dB (A-weighted), the reference exposure limit value of the noise
equivalent sound level in the workplace can be found in Appendix B.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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