Air sampler

Air sampler

An instrument for measuring the average concentration of dust in the air of a work shift, which can also be connected to glass absorption bottles, activated carbon tubes, micro sampling heads, etc. to match different loads,1 0The flow error within the hour does not exceed5.0%FSMeasurable toxic and harmful gases underground in coal mines8Hourly average weighted concentration.This instrument is based onGB/T 20964-2007Technical Conditions for Dust SamplersJJG520—2005《Dust samplerVerification Regulations "JJG956—2013《air samplerVerification Regulations "Q/320581SXYB009-2025Technical Specifications for Air Sampler ProductsGB3836.1-2021TheGB 3836.4-2021in the standardExibI Mblevel(Mining intrinsic safety type)Explosion proof design.

This instrument has the advantages of small sampling airflow pulsation, large load capacity, stable flow rate, and can be sampled at fixed time, constant volume, and cyclic. Explosion proof lithium manganese oxide battery with dual charge and discharge protection and electronic current limiting function for better battery utilization. The separation efficiency of respiratory dust is in line with the characteristics of simple operation, safety and reliability, and easy portability“BMRC”The international standard curve requirements are particularly applicable to underground coal mines.The instrument has a compact structure, simple operation, and load capacity、Ultra high negative pressure capability, automatic timed sampling、Equipped with automatic constant current stabilization function,Features such as fully Chinese LCD display and easy portability. This instrument belongs to a domestic enterprise that has obtained a coal mine safety mark certificate. This technology is imported from abroad and is still blank in China.

2、 Main parameters

2.2Basic parameters of the product

The basic parameters of the product are as follows:The basic parameters of the product are shown in the table1

table 1

2.3Working conditions

The operation of the product should meet the following basic conditions:

a) Storage temperature:-40℃～60℃；

b) Operating Temperature0℃～40℃

c) Relative humidity: ≤95%（25℃）；

d) Environmental atmospheric pressure:（80～110）KPa.

2.4Appearance requirements

a) The appearance of the product should meet the following basic requirements:

b) The product name, model, manufacturing year and month, serial number, and manufacturer name should be complete and clear;

c) The digital display is clear and there are no missing strokes.

2.5Product structure requirements

The product structure should meet the following requirements:

a)The movable parts such as buttons should be lightweight, flexible, and comfortable, and each knob should be able to be adjusted normally;

b)The loading and unloading of various accessories should be stable and reliable, and the coordination and positioning should be accurate.

3、 Performance requirements

3.1Main technical indicators

3.1.1Sampling traffic:500-5500mL/min

3.1.2Sampling flow error: ≤±5.0%FS.

3.1.3Sampling flow stability:Continuous sampling10Hourly flow stability ≤±3.0%FS

3.1.4Load capacity: ≥5000Pa

3.1.5Continuous working hours:≥10hour

3.1.6Sampling time error: timing error not exceeding1.0s.

3.1.7Sampling volume display error: Sampling volume display error:≤3.0%FS.

3.1.8noise:Sampler runtime distance from sampler1mThe distance and noise are not greater than65dB(A).

3.1.9Function: It has real-time display of temperature, humidity, and atmospheric pressure.

3.2Explosion proof performance

3.2.1Any component related to intrinsic safety performance in the sampler should comply withGB 3836.4-2021pass the civil examinations7The regulations of the chapter. Under normal operation and fault conditions, it is not allowed toOperate beyond two-thirds of the current, voltage, and power ratings specified by the component installation conditions and temperature range.

3.2.2The sampler should adopt a mining intrinsic safety structure and meet the requirements ofGB3836.1-2021andGB 3836.4-2021The regulations.

3.2.3The sampler adopts a plastic shell, and its surface insulation resistance is ≤1GΩ.

3.2.4The casing, wires, and components of the sampler under normal operation and fault conditions Surface temperature ≤150℃.

3.2.5The protective performance of the shell should comply withGB4208-2008ChineseIP54Protection level regulations.

3.2.6The structure of the sampler casing should comply with the electrical distance, electrical clearance, and spacing requirementsGB 3836.4-2021pass the civil examinations6The regulations of the chapter.

3.3.7The battery should meet the requirementsGB3836.4-2021pass the civil examinations7.4.2The battery leakage test requirements are stipulated in the regulations.

3.2.8The sampler should be able to withstand4 Falling to a height of1.0mThe ground test of horizontal concrete does not affect its explosion-proof performance after the test.

3.2.9The spark ignition test of intrinsic safety circuits should comply withGB 3836.4-2021第10.1The regulations.

3.2.10The sampler battery adoptsPL805065type2000mAhLithium ion manganese oxide battery2Connected in series, externally connected with a secondary current limiting protection current board protection circuit, encapsulated with epoxy resin and placed inside a battery box to form an intrinsic safety battery module,Uo：8.6V，Io：1.0AThe battery should comply withMT/T1051-2007The requirements.

4、 Structural features and working principle

4.1.structural characteristics

The casing of the sampler is made of flame-retardant materialABSEngineering plastics have been treated with moisture-proof and anti-static measures. The instrument functions all use closed touch buttons for start and stop, reducing misoperation, ensuring service life, and making the dust removal effect more obvious. The whole machine has the characteristics of compact structure, small volume, light weight, automatic timing, and intuitive flow display, making it easy to use on site, especially suitable for use in work environments containing explosive gases.

Air sampler