STATE STANDARD OF THE USSR UNION

Occupational Safety Standards System

Air working area

Method for measuring concentrations of harmful substances
indicator tubes

GOST 12.1.014-84

MOSCOW

APPROVED AND ENTERED INTO EFFECT by Resolution State Committee USSR according to standards of December 14, 1984 No. 4362

INSTEAD GOST 12.1.014-79

The validity period was lifted by decision of the Interstate Council for Standardization, Metrology and Certification (Protocol No. 5-94)

REISSUE (January 1996) with Change No. 1, approved in March 1990 (IUS 7-90)

This standard specifies accelerated method measuring concentrations of harmful substances in the air of the working area using indicator tubes, except for the air of underground mine workings.

The essence of the method is to change the color of the indicator powder as a result of a reaction with a harmful substance (gas or steam) in the analyzed air sucked through the tube. Concentration measurement harmful substance is made according to the length of the layer of indicator powder in the tube that has changed its original color (linear-coloristic indicator tube) or according to its intensity (colorimetric indicator tube).

The terms used in the standard and their explanations are given in the Appendix.

The characteristics of the produced indicator powders are given in the Appendix.

The standardized metrological characteristics of indicator tubes and air intake devices for them are given in the Appendix.

STATE STANDARD OF THE USSR UNION

Date of introduction 1986-01-01

1. EQUIPMENT

1.1. Indicator tubes, including those equipped by the consumer using special kits with indicator powders.

1.2. Filter tubes, including those equipped by the consumer using special kits.

1.3. An air intake device (such as a pump, bellows, etc.) designed for use with this indicator tube.

2. PREPARATION FOR MEASUREMENT

2.1. Preparation of equipment for measuring concentrations of harmful substances in the air of the working area is carried out in accordance with regulatory documentation on indicator and filter tubes and the air intake device intended for them.

2.2. In the unexplored production conditions Before carrying out measurements with indicator tubes, it is necessary to conduct a one-time qualitative assessment of the composition of the air in the working area using certified methods or methodological instructions, approved by the USSR Ministry of Health. Based on the data obtained, the possibility of using indicator tubes for planned or operational control. Regardless of the composition of the air in the working area, the use of filter tubes with indicator tubes, if provided for in the regulatory documentation for indicator tubes, is mandatory in order to avoid violating the operating conditions of the indicator tubes.

A repeated qualitative assessment of the air composition of the working area should be carried out with each change in production technology that may cause the appearance of air environment new harmful substances.

2.1, 2.2 (Changed edition, Amendment No. 1).

3. MEASUREMENT

barometric pressure - from 90 to 104 kPa (680-780 mm Hg);

relative humidity - 30 - 80%;

temperature - from 288 to 303 K.

Deviations from the specified parameters are allowed if this is provided for in the regulatory and technical documentation for measuring instruments.

Monitoring the metrological parameters of the air in the working area should be carried out in parallel with measuring the concentrations of harmful substances using indicator tubes.

3.2. An indicator tube, designed to measure the concentration of a harmful substance, and filter tubes, if provided for by regulatory documentation, are connected to the air intake device.

Measurement should begin no later than 1 minute after depressurization of the tubes.

3.1, 3.2 (Changed edition, Amendment No. 1).

3.3. The amount of air sucked through the indicator tubes is set in accordance with the regulatory documentation for these tubes.

3.6. If the interface between the colors of the layers of the original and reacted indicator powder is blurred, the concentration of the measured harmful substance is measured on the scale at the bottom and upper parts borders. The average value is taken as the measurement result.

Concentration ( WITH m) under normal conditions in mg/m3 is calculated using the formula

where is the result of measuring the concentration of a harmful substance at ambient temperature, t°С, relative humidityφ% and atmospheric pressure r kPa, mg/m3;

K B is a coefficient that takes into account the influence of temperature and humidity of the ambient air on the readings of indicator tubes, the value of which is determined in accordance with paragraph of the appendix.

The relative measurement error (δ) should not exceed ±35% in the range up to 2.0 maximum permissible concentrations (MPC), inclusive, and ±25% at concentrations above 2.0 MAC under the conditions specified in clause .

The measurement result is presented as: ( WITH H ± Δ) mg/m3 at a confidence level of 0.95.

The absolute error D is calculated using the formula

In the range up to 1.0 MPC inclusive, an increase in error of up to ±60% is allowed. This relative error value must be indicated in the regulatory and technical documentation for the measuring instruments.

(Changed edition, Amendment No. 1).

4. SAFETY REQUIREMENTS

4.1. When measuring the concentrations of harmful substances with indicator tubes in the air of the working area, you must comply with the safety standards and regulations in force in this production.

4.2. Measurement of concentrations of harmful substances with indicator tubes is carried out by persons who have been trained and authorized to work on monitoring harmful substances in the air of the working area.

4.3. When opening the tubes, it is necessary to take all precautions when working with glass, using special devices and protective equipment.

APPLICATION 1
Information

TERMS USED IN THE STANDARD AND THEIR EXPLANATIONS

(Changed edition, Amendment No. 1).

APPLICATION 2
Information

CHARACTERISTICS OF PRODUCED INDICATOR POWDERS FOR EQUIPING INDICATOR TUBES

(Changed edition, Amendment No. 1).

APPLICATION 3
Information

NORMALIZED METROLOGICAL CHARACTERISTICS OF INDICATOR TUBES AND AIR INCLUSION DEVICES FOR THEM

1. Metrological characteristics

1.1. For linear-color indicator tubes, the following metrological characteristics are established:

nominal static conversion characteristic,

range of measured concentrations,

main error

relative error,

influence functions caused by a change in an influencing quantity within operating conditions.

1.2. The characteristics of indicator tubes designed to determine the presence of a harmful substance in the air of the working area (colorimetric indicator tubes) are:

nominal value of the concentration of a harmful substance causing the appearance of an indication effect (activation concentration);

operation error.

1.3. The following metrological characteristics are established for air intake devices:

volume of sucked air,

error in dosing the volume of sucked air.

Instead of volume, it is permissible to normalize the duration of suction and the volumetric flow rate of air sucked through the indicator tube.

2. Methods of standardization and forms of presentation of metrological characteristics

2.1. The nominal static conversion characteristic is presented in the form of a formula or graph, which corresponds to a scale printed on an indicator tube, cassette or special label.

2.2. The range of measured concentrations is characterized by its lower and upper boundaries. The lower limit of the measurement range should be no more than 0.5 maximum permissible concentration, and the upper limit - no less than 5 maximum permissible concentrations for a given substance.

It is possible to divide the measurement range into several subranges by changing the volume of air sucked through the indicator tube, setting a nominal static conversion characteristic for each of these volumes.

If the reading range does not coincide with the measurement range, then the reading range is normalized by setting the initial and final scale values.

2.3. The main error of indicator tubes is characterized by the limit of permissible main error. The values ​​of the maximum permissible basic error must be selected from the range established in GOST 8.401-80.

At the stages of development of indicator tubes, their main error is characterized by:

the limit of the permissible value of the systematic component of the main error,

the limit of the permissible value of the standard deviation of the random component of the main error.

2.4. The number of sequentially used indicator tubes, ensuring a reduction in the error of the measurement result of the concentration of a harmful substance to values ​​​​not exceeding those established in paragraph of this standard, is established in the regulatory documentation and should be no more than 5.

2.8. The regulatory documentation for specific indicator tubes includes data on impurities in the gas-air environment that interfere with the measurement of concentrations of a given harmful substance. An impurity is considered non-interfering if, with an impurity concentration at a level of 5 maximum permissible values ​​for it, the value of the main error of the indicator tube is less than the established limit.

2.9. The regulatory documentation for indicator tubes must indicate the storage conditions and the guaranteed storage period during which the error values ​​of the indicator tubes are within the established limits.

The values ​​of the guaranteed shelf life of indicator tubes are selected from row 1; 1.5; 2; 3 and 5 years old.

2.10. The volume of air drawn through the indicator tube using an air intake device is expressed in cm3.

The dosing error of the volume of sucked air is characterized by the limit of the permissible value and is selected from the range of 5, 3, 2, 1 and 0.5%.

The air intake device intended for use with the indicator tube must have the same flow characteristics as the air intake device used for calibration of the indicator tube.

GOST 12.1.014-84*

UDC 614.71:543.27:006.354 Group T58

INTERSTATE STANDARD

Occupational Safety Standards System

WORKING AREA AIR

Method for measuring concentrations of harmful substances using indicator tubes

Occupational safety standards system.
Air of the zone of operation. Method of measuring unhealthy matters
concentration using indicator tubes

OKSTU 0012
Date of introduction 1986-01-01

APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated December 14, 1984 No. 4362

INSTEAD GOST 12.1.014-79

The validity period was lifted according to Protocol No. 5-94 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-12-94)

REISSUE (April 2001) with Change No. 1, approved in March 1990 (IUS 7-90)

This standard establishes an accelerated method for measuring concentrations of harmful substances in the air of a working area using indicator tubes, except for the air of underground mines.
The essence of the method is to change the color of the indicator powder as a result of a reaction with a harmful substance (gas or steam) in the analyzed air sucked through the tube. The concentration of a harmful substance is measured by the length of the layer of indicator powder in the tube that has changed its original color (linear-color indicator tube) or by its intensity (colorimetric indicator tube).
The terms used in the standard and their explanations are given in Appendix 1.
The characteristics of the produced indicator powders are given in Appendix 2.
The standardized metrological characteristics of indicator tubes and air intake devices for them are given in Appendix 3.

1. EQUIPMENT

1.1 Indicator tubes, including those equipped by the consumer using special kits with indicator powders.
1.2 Filter tubes, including those equipped by the consumer using special kits.

1.3 Air intake device (such as pump, bellows, etc.) designed for use with this indicator tube.

2. PREPARATION FOR MEASUREMENT

2.1 Preparation of equipment for measuring concentrations of harmful substances in the air of the working area is carried out in accordance with the regulatory documentation for indicator and filter tubes and the air intake device intended for them.
2.2 In unstudied production conditions, before carrying out measurements with indicator tubes, it is necessary to conduct a one-time qualitative assessment of the air composition of the working area using certified methods or guidelines approved by the USSR Ministry of Health. Based on the data obtained, the possibility of using indicator tubes for planned or operational monitoring is established. Regardless of the composition of the air in the working area, the use of filter tubes with indicator tubes, if provided for in the regulatory documentation for indicator tubes, is mandatory in order to avoid violating the operating conditions of the indicator tubes.
A repeated qualitative assessment of the air composition of the working area should be carried out with each change in production technology, which may cause the appearance of new harmful substances in the air environment.

2.1, 2.2 (Changed edition, Amendment No. 1).

3. MEASUREMENT

3.1 Measurement of concentrations of harmful substances in the air of the working area is carried out under the following parameters:
barometric pressure - from 90 to 104 kPa (680-780 mm Hg);
relative humidity - 30-80%;
temperature - from 288 to 303 K.
Deviations from the specified parameters are allowed if this is provided for in the regulatory and technical documentation for measuring instruments.
Monitoring the metrological parameters of the air in the working area should be carried out in parallel with measuring the concentrations of harmful substances using indicator tubes.
3.2 An indicator tube designed to measure the concentration of a harmful substance and filter tubes, if provided for by regulatory documentation, are connected to the air intake device.
Measurement should begin no later than 1 minute after depressurization of the tubes.

3.1, 3.2 (Changed edition, Amendment No. 1).

3.3 The amount of air sucked through the indicator tubes is set in accordance with the regulatory documentation for these tubes.
3.4 Measurement of concentrations of harmful substances is carried out sequentially under production conditions in accordance with GOST 12.1.005-88. In this case, the number of indicator tubes specified in the relevant regulatory documentation is used.
3.5 The concentration of a harmful substance in mg/m3 in the air of the working area is measured by the length or intensity of the layer of indicator powder that has changed its original color using a scale applied to the indicator tube, cassette or special label. The arithmetic mean of successive observations is taken as the measurement result, as indicated in clause 3.4.
3.6 If the boundary between the colors of the layers of the original and reacted indicator powder is blurred, the concentration of the measured harmful substance is measured on a scale along the lower and upper parts of the boundary. The average value is taken as the measurement result.
3.7 The result of measuring the concentration of a harmful substance leads to normal conditions (SN): temperature 293 K, atmospheric pressure 101.3 kPa (760 mm Hg), relative humidity 60%.
Concentration (CH) under normal conditions in mg/m3 is calculated using the formula

where is the result of measuring the concentration of a harmful substance at ambient temperature, t ° C, relative humidity - % and atmospheric pressure p kPa, mg/m3;
KB is a coefficient that takes into account the influence of ambient temperature and humidity on the readings of indicator tubes, the value of which is determined in accordance with clause 2.5 of Appendix 3.
The relative measurement error () should not exceed ±35% in the range up to 2.0 maximum permissible concentrations (MPC), inclusive, and ±25% at concentrations above 2.0 MAC under the conditions specified in clause 3.1.
The measurement result is presented as: (CH ±) mg/m3 with a confidence probability of 0.95.
The absolute error () is calculated using the formula

In the range up to 1.0 MPC inclusive, an increase in error of up to ±60% is allowed. This relative error value must be indicated in the regulatory and technical documentation for the measuring instruments.

(Changed edition, Amendment No. 1).

4. SAFETY REQUIREMENTS

4.1 When measuring the concentrations of harmful substances with indicator tubes in the air of the working area, you must comply with the safety standards and regulations in force in this production.
4.2 Measurement of concentrations of harmful substances with indicator tubes is carried out by persons who have been trained and authorized to work on monitoring harmful substances in the air of the working area.
4.3 When opening the tubes, it is necessary to take all precautions when working with glass, using special devices and protective equipment.

APPENDIX 1
(informative)

TERMS USED IN THE STANDARD AND THEIR EXPLANATIONS

Term Explanation
Working area According to GOST 12.1.005-88
Method for measuring the concentration of harmful substances According to RMG 29-99
Harmful substance According to GOST 12.1.007-76
Maximum permissible concentrations of harmful substances in the air of the working area According to GOST 12.1.005-88
Indicator tube Primary measuring transducer, structurally consisting of a glass tube filled with granular filler (indicator powder)
Linear-color indicator tube An indicator tube that allows you to measure the concentration of a harmful substance in the analyzed air sucked through the tube along the length of the layer of indicator powder in the tube that has changed its original color
Colorimetric indicator tube An indicator tube that makes it possible to judge the presence of a harmful substance in the analyzed air sucked through the tube, in a concentration greater than the response concentration for a given indicator tube, by the color intensity of the indicator powder by comparison with a control sample of the indicator effect
Filter tube A glass tube filled with one or more absorbers that serve to trap gases and vapors that interfere with the measurement of a harmful substance

GOST 12.1.014-84

Group T58

STATE STANDARD OF THE USSR UNION

SYSTEM OF OCCUPATIONAL SAFETY STANDARDS

Work area air

Method for measuring concentrations of harmful substancesindicator tubes

Occupational safety standards system.

Air of the work zone. Method of measuringunhealthy matters concentration using indicator tubes

Date of introduction 1986-01-01

APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated December 14, 1984 N 4362

INSTEAD GOST 12.1.014-79

The validity period was lifted by decision of the Interstate Council for Standardization, Metrology and Certification (Protocol No. 5-94)

REISSUE (January 1996) with Change No. 1, approved in March 1990 (IUS 7-90)

This standard establishes an accelerated method for measuring concentrations of harmful substances in the air of a working area using indicator tubes, except for the air of underground mines.

The essence of the method is to change the color of the indicator powder as a result of a reaction with a harmful substance (gas or steam) in the analyzed air sucked through the tube. The concentration of a harmful substance is measured by the length of the layer of indicator powder in the tube that has changed its original color (linear-color indicator tube) or by its intensity (colorimetric indicator tube).

The terms used in the standard and their explanations are given in Appendix 1.

The characteristics of the produced indicator powders are given in Appendix 2.

The standardized metrological characteristics of indicator tubes and air intake devices for them are given in Appendix 3.

1 Equipment

1.1 Indicator tubes, including those equipped by the consumer using special kits with indicator powders.

1.2 Filter tubes, including those equipped by the consumer using special kits.

1.3 Air intake device (such as pump, bellows, etc.) designed for use with this indicator tube.

2 Preparation for measurement

2.1 Preparation of equipment for measuring concentrations of harmful substances in the air of the working area is carried out in accordance with the regulatory documentation for indicator and filter tubes and the air intake device intended for them.

2.2 In unstudied production conditions, before carrying out measurements with indicator tubes, it is necessary to conduct a one-time qualitative assessment of the air composition of the working area using certified methods or guidelines approved by the USSR Ministry of Health. Based on the data obtained, the possibility of using indicator tubes for planned or operational monitoring is established. Regardless of the composition of the air in the working area, the use of filter tubes with indicator tubes, if provided for in the regulatory documentation for indicator tubes, is mandatory in order to avoid violating the operating conditions of the indicator tubes.

A repeated qualitative assessment of the air composition of the working area should be carried out with each change in production technology, which may cause the appearance of new harmful substances in the air environment.

2.1, 2.2

3 Taking a measurement

3.1 Measurement of concentrations of harmful substances in the air of the working area is carried out under the following parameters:

barometric pressure - from 90 to 104 kPa (680-780 mm Hg);

relative humidity - 30-80%;

temperature - from 288 to 303 K.

Deviations from the specified parameters are allowed if this is provided for in the regulatory and technical documentation for measuring instruments.

Monitoring the metrological parameters of the air in the working area should be carried out in parallel with measuring the concentrations of harmful substances using indicator tubes.

3.2 An indicator tube designed to measure the concentration of a harmful substance and filter tubes, if provided for by regulatory documentation, are connected to the air intake device.

Measurement should begin no later than 1 minute after depressurization of the tubes.

3.1, 3.2 (Changed edition, Amendment No. 1).

3.3 The amount of air sucked through the indicator tubes is set in accordance with the regulatory documentation for these tubes.

3.4 Measurement of concentrations of harmful substances is carried out sequentially under production conditions in accordance with GOST 12.1.005-88. In this case, the number of indicator tubes specified in the relevant regulatory documentation is used.

3.5 Concentration of harmful substance in mg/m 3 in the air of the working area is measured by the length or intensity of the layer of indicator powder that has changed its original color using a scale applied to the indicator tube, cassette or special label. The arithmetic mean of successive observations is taken as the measurement result, as specified in 3.4.

3.6 If the boundary between the colors of the layers of the original and reacted indicator powder is blurred, the concentration of the measured harmful substance is measured on a scale along the lower and upper parts of the boundary. The average value is taken as the measurement result.

3.7 The result of measuring the concentration of a harmful substance leads to normal conditions (СН): temperature 293 K, atmospheric pressure 101.3 kPa (760 mm Hg), relative humidity 60%.

Concentration (CH) under normal conditions in mg/m3 is calculated using the formula

where is the result of measuring the concentration of a harmful substance at ambient temperature, t °C, relative humidity j - % and atmospheric pressure p kPa, mg/m3;

K B - coefficient taking into account the influence of ambient temperature and humidity on the readings of indicator tubes, the value of which is determined in accordance with clause 2.5 of Appendix 3.

Relative measurement error(d) should not exceed ±35% in the range up to 2.0 maximum permissible concentrations (MPC), inclusive, and ±25% at concentrations above 2.0 MAC under the conditions specified in clause 3.1.

The measurement result is presented as:(CH ±? ) mg/m 3 with a confidence probability of 0.95.

The magnitude of the absolute error(? ) calculated by the formula

In the range up to 1.0 MPC inclusive, an increase in error of up to ±60% is allowed. This relative error value must be indicated in the regulatory and technical documentation for the measuring instruments.

(Changed edition, Amendment No. 1).

4 Safety requirements

4.1 When measuring the concentrations of harmful substances with indicator tubes in the air of the working area, you must comply with the safety standards and regulations in force in this production.

4.2 Measurement of concentrations of harmful substances with indicator tubes is carried out by persons who have been trained and authorized to work on monitoring harmful substances in the air of the working area.

4.3 When opening the tubes, it is necessary to take all precautions when working with glass, using special devices and protective equipment.

Appendix 1

(informative)

Terms used in the standard and their explanations

Interstate standard GOST 12.1.014-84
"System of occupational safety standards. Work area air. Method for measuring concentrations of harmful substances with indicator tubes"
(approved by Decree of the USSR State Standard of December 14, 1984 N 4362)

Occupational safety standards system. Air in the zone of operation. Method of measuring unhealthy matters concentration using indicator tubes.

Instead of GOST 12.1.014-79

This standard establishes an accelerated method for measuring concentrations of harmful substances in the air of a working area using indicator tubes, except for the air of underground mines.

The essence of the method is to change the color of the indicator powder as a result of a reaction with a harmful substance (gas or steam) in the analyzed air sucked through the tube. The concentration of a harmful substance is measured by the length of the layer of indicator powder in the tube that has changed its original color (linear-color indicator tube) or by its intensity (colorimetric indicator tube).

The terms used in the standard and their explanations are given in Appendix 1.

The characteristics of the produced indicator powders are given in Appendix 2.

Standardized metrological characteristics of indicator tubes and air intake devices for them are given in Appendix 3.

1. Equipment

1.1. Indicator tubes, including those equipped by the consumer using special kits with indicator powders.

1.2. Filter tubes, including those equipped by the consumer using special kits.

1.3. An air intake device (such as a pump, bellows, etc.) designed for use with this indicator tube.

2. Preparation for measurement

2.1. Preparation of equipment for measuring concentrations of harmful substances in the air of the working area is carried out in accordance with the regulatory and technical documentation for indicator and filter tubes and the air intake device intended for them.

2.2. In unstudied production conditions, before carrying out measurements with indicator tubes, it is necessary to conduct a one-time qualitative assessment of the air composition of the working area using certified methods or guidelines approved by the USSR Ministry of Health. Based on the data obtained, the possibility of using indicator tubes for planned or operational monitoring is established. Regardless of the composition of the air in the working area, the use of filter tubes with indicator tubes, if provided for in the regulatory and technical documentation for indicator tubes, is mandatory in order to avoid violation of the operating conditions of the indicator tubes.

A repeated qualitative assessment of the air composition of the working area should be carried out with each change in production technology, which may cause the appearance of new harmful substances in the air environment.

2.1, 2.2. (Changed edition, Amendment No. 1).

3. Taking measurements

3.1. Measurement of concentrations of harmful substances in the air of the working area is carried out under the following parameters:

barometric pressure - from 90 to 104 kPa (680-780 mm Hg);

relative humidity - 30-80%;

temperature - from 288 to 303 K.

Deviations from the specified parameters are allowed if this is provided for in the regulatory and technical documentation for measuring instruments.

Monitoring the meteorological parameters of the air in the working area should be carried out in parallel with measuring the concentrations of harmful substances using indicator tubes.

3.2. An indicator tube designed to measure the concentration of a harmful substance, and filter tubes, if they are provided for in the regulatory and technical documentation, are connected to the air intake device.

Measurement should begin no later than 1 minute after depressurization of the tubes.

3.1, 3.2. (Changed edition, Amendment No. 1).

3.3. The amount of air sucked through the indicator tubes is set in accordance with the regulatory and technical documentation for these tubes.

3.4. Measurement of concentrations of harmful substances is carried out sequentially under production conditions in accordance with GOST 12.1.005-88. In this case, the number of indicator tubes specified in the relevant regulatory and technical documentation is used.

3.5. The concentration of a harmful substance in mg/m3 in the air of the working area is measured by the length or intensity of the layer of indicator powder that has changed its original color using a scale applied to the indicator tube, cassette or special label. The arithmetic mean of successive observations is taken as the measurement result, as indicated in clause 3.4.

3.6. If the boundary between the colors of the layers of the original and reacted indicator powder is blurred, the concentration of the measured harmful substance is measured on a scale along the lower and upper parts of the boundary. The average value is taken as the measurement result.

3.7. The result of measuring the concentration of a harmful substance leads to normal conditions (С_н): temperature 293 K, atmospheric pressure 101.3 kPa (760 mm Hg), relative humidity 60%.

Concentration (С_н) under normal conditions in mg/m3 is calculated using the formula

_ (273 + t) x 101.3 C = C, phi, p ------------------ x K, n t 293 x p in _ where C, phi, p is the result of measuring the concentration of a harmful substance, t at ambient temperature t°C, relative humidity fi % and atmospheric pressure p kPa, mg/m3; K is a coefficient that takes into account the influence of temperature and humidity of the ambient air on the readings of indicator tubes, the value of which is determined in accordance with paragraph 2.5 of Appendix 3.

The relative measurement error (delta) should not exceed + -35% in the range up to 2.0 maximum permissible concentrations (MPC) inclusive and + -25% at concentrations above 2.0 MAC under the conditions specified in clause 3.1.

The measurement result is presented in the form: (C_n+-Delta) mg/m3 with a confidence probability of 0.95. The absolute error (Delta) is calculated using the formula

Delta Delta = C ------. n 100

In the range up to 1.0 MPC inclusive, an increase in error up to +-60% is allowed. This relative error value must be indicated in the regulatory and technical documentation for the measuring instruments.

(Changed edition, Amendment No. 1).

4. Safety requirements

4.1. When measuring the concentrations of harmful substances with indicator tubes in the air of the working area, you must comply with the safety standards and regulations in force in this production.

4.2. Measurement of concentrations of harmful substances with indicator tubes is carried out by persons who have been trained and authorized to work on monitoring harmful substances in the air of the working area.

4.3. When opening the tubes, it is necessary to take all precautions when working with glass, using special devices and protective equipment.

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GOST 12.1.014-84

Group T58

INTERSTATE STANDARD

Occupational Safety Standards System

WORKING AREA AIR

Method for measuring concentrations of harmful substances using indicator tubes

Occupational safety standards system. Air in the zone of operation. Method of measuring unhealthy matters concentration using indicator tubes

ISS 13.040.30
OKSTU 0012

Date of introduction 1986-01-01

By Decree of the USSR State Committee on Standards dated December 14, 1984 N 4362, the implementation date was set as 01/01/86

The validity period was lifted according to Protocol No. 5-94 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-12-94)

INSTEAD GOST 12.1.014-79

EDITION (October 2010) with Change No. 1, approved in March 1990 (IUS 7-90).

This standard establishes an accelerated method for measuring concentrations of harmful substances in the air of a working area using indicator tubes, except for the air of underground mines.

The essence of the method is to change the color of the indicator powder as a result of a reaction with a harmful substance (gas or steam) in the analyzed air sucked through the tube. The concentration of a harmful substance is measured by the length of the layer of indicator powder in the tube that has changed its original color (linear-color indicator tube) or by its intensity (colorimetric indicator tube).

The terms used in the standard and their explanations are given in Appendix 1.

The characteristics of the produced indicator powders are given in Appendix 2.

The standardized metrological characteristics of indicator tubes and air intake devices for them are given in Appendix 3.

1. EQUIPMENT

1. EQUIPMENT

1.1. Indicator tubes, including those equipped by the consumer using special kits with indicator powders.

1.2. Filter tubes, including those equipped by the consumer using special kits.

1.3. An air intake device (such as a pump, bellows, etc.) designed for use with this indicator tube.

2. PREPARATION FOR MEASUREMENT

2.1. Preparation of equipment for measuring concentrations of harmful substances in the air of the working area is carried out in accordance with the regulatory and technical documentation for indicator and filter tubes and the air intake device intended for them.

2.2. In unstudied production conditions, before carrying out measurements with indicator tubes, it is necessary to conduct a one-time qualitative assessment of the air composition of the working area using certified methods or guidelines approved by the USSR Ministry of Health. Based on the data obtained, the possibility of using indicator tubes for planned or operational monitoring is established. Regardless of the composition of the air in the working area, the use of filter tubes with indicator tubes, if provided for in the regulatory and technical documentation for indicator tubes, is mandatory in order to avoid violation of the operating conditions of the indicator tubes.

A repeated qualitative assessment of the air composition of the working area should be carried out with each change in production technology, which may cause the appearance of new harmful substances in the air environment.

2.1, 2.2. (Changed edition, Amendment No. 1).

3. MEASUREMENT

3.1. Measurement of concentrations of harmful substances in the air of the working area is carried out under the following parameters:

barometric pressure - from 90 to 104 kPa (680-780 mm Hg);

relative humidity - 30-80%;

temperature - from 288 to 303 K.

Deviations from the specified parameters are allowed if this is provided for in the regulatory and technical documentation for measuring instruments.

Monitoring the metrological parameters of the air in the working area should be carried out in parallel with measuring the concentrations of harmful substances using indicator tubes.

3.2. An indicator tube designed to measure the concentration of a harmful substance, and filter tubes, if they are provided for in the regulatory and technical documentation, are connected to the air intake device.

Measurement should begin no later than 1 minute after depressurization of the tubes.

3.1, 3.2. (Changed edition, Amendment No. 1).

3.3. The amount of air sucked through the indicator tubes is set in accordance with the regulatory and technical documentation for these tubes.

3.4. Measurement of concentrations of harmful substances is carried out sequentially under production conditions in accordance with GOST 12.1.005-88. In this case, the number of indicator tubes specified in the relevant regulatory and technical documentation is used.

3.5. The concentration of a harmful substance in mg/m in the air of the working area is measured by the length or intensity of the layer of indicator powder that has changed its original color using a scale applied to the indicator tube, cassette or special label. The arithmetic mean of successive observations is taken as the measurement result, as indicated in clause 3.4.

3.6. If the boundary between the colors of the layers of the original and reacted indicator powder is blurred, the concentration of the measured harmful substance is measured on a scale along the lower and upper parts of the boundary. The average value is taken as the measurement result.

3.7. The result of measuring the concentration of a harmful substance leads to normal conditions (): temperature 293 K, atmospheric pressure 101.3 kPa (760 mm Hg), relative humidity 60%.

Concentration () under normal conditions in mg/m is calculated using the formula

where is the result of measuring the concentration of a harmful substance at ambient temperature °C, relative humidity % and atmospheric pressure kPa, mg/m;

- coefficient taking into account the influence of ambient temperature and humidity on the readings of indicator tubes, the value of which is determined in accordance with clause 2.5 of Appendix 3.

The relative measurement error should not exceed ±35% in the range up to 2.0 maximum permissible concentrations (MPC), inclusive, and ±25% at concentrations above 2.0 MAC under the conditions specified in clause 3.1.

The measurement result is presented as: mg/m with a confidence probability of 0.95.

The absolute error value is calculated using the formula

In the range up to 1.0 MPC inclusive, an increase in error of up to ±60% is allowed. This relative error value must be indicated in the regulatory and technical documentation for the measuring instruments.

(Changed edition, Amendment No. 1).

4. SAFETY REQUIREMENTS

4.1. When measuring the concentrations of harmful substances with indicator tubes in the air of the working area, you must comply with the safety standards and regulations in force in this production.

4.2. Measurement of concentrations of harmful substances with indicator tubes is carried out by persons who have been trained and authorized to work on monitoring harmful substances in the air of the working area.

4.3. When opening the tubes, it is necessary to take all precautions when working with glass, using special devices and protective equipment.

APPENDIX 1 (for reference). TERMS USED IN THE STANDARD AND THEIR EXPLANATIONS

APPENDIX 1
Information