The high-pressure volumetric method gas adsorption apparatus is primarily used to determine the adsorption constants (a, b values) of coal to gas during the measurement of coal mine gas content. Based on the actual gas pressure measured underground, it can then calculate the gas content per ton of coal seam.
Scope of Application and Environmental Conditions for the High-Pressure Volumetric Method Gas Adsorption Apparatus
Ambient temperature: 0°C to 30°C, relative humidity not exceeding 95% (at +25°C),
Atmospheric pressure: 80 kPa to 106 kPa.

High-Pressure Volumetric Method Gas Adsorption Apparatus Performance Features:
The equipment includes water level detection and dry-burn protection functions; it enables automatic water filling and automatic drainage.
The software comes with calibration functions to calculate the volume of the gas charging tank and sample tank.
Reports automatically generate two isothermal adsorption curves (air-dried basis and dry ash-free basis) along with experimental data; it also includes calculation and display of equilibrium moisture adsorption capacity.
The entire laboratory setup is equipped with gas leak alarms and environmental monitoring alarm systems. In case of methane leakage, it can automatically activate exhaust fans for ventilation and trigger audible and visual alarms.
It features power-off protection: during a sudden power outage, the intake valve automatically cuts off gas supply to prevent sensor overload damage, gas leakage, and other safety incidents.

High-Pressure Volumetric Method Gas Adsorption Apparatus Technical Parameters:
1. Weighing System
Electronic balance: maximum capacity 200g, accuracy 0.0001g;
Desiccator: specification 210mm;
Coal sample cup: specification Φ70×35mm;
Vernier caliper: length 15cm, accuracy 0.02mm.
2. Vacuum Drying System
Vacuum drying oven: temperature 20–200°C, temperature fluctuation ±1°C, vacuum level: atmospheric pressure to 267 Pa;
Rotary vane vacuum pump: pumping speed 2.2 L/s, pressure ≤5×10?2 Pa;
Vacuum rubber hose: 1.8m.
3. Degassing System
Direct-drive high-speed rotary vane vacuum pump: model TRP-90, pumping efficiency 25 L/s, vacuum level <4×10?2 Pa;
Resistance vacuum gauge: model ZDR-I-LED;
Vacuum gauge pipeline: model ZJ-52T/KF10/16;
Constant temperature water bath: model HC10, temperature 10–95°C, temperature fluctuation ±0.1°C;
Vacuum degassing chamber: includes 2 glass two-way stopcocks, gas path system;
Adsorption tank holder: supports adsorption tank when placed in the constant temperature water bath (HC10);
Vacuum rubber hose: 1.8m.
4. Gas Charging System
High-pressure gas cylinder: filled with pure methane gas at pressure ≥5 MPa (concentration ≥99.9%);
Pressure reduction storage tank: pressure 0–6 MPa;
Pressure gauge: measuring range 0–10 MPa;
4 needle valves; gas path system: 1 set; adsorption tank base: secures the adsorption tank when tightening the screws;
Methane gas cylinder, concentration: 99.99%; volume: 40L.
5. Adsorption System
Adsorption tank: high-pressure container for coal samples, volume 80 cm3;
Pressure sensor: model HM20-1-A1-F1-W2, range 0–8 MPa;
HOKE valve: leakage <1×10??;
Constant temperature water bath: model HC20, temperature 10–95°C, temperature fluctuation ±0.1°C;
1 experimental cabinet;
Adsorption burette: used to measure the volume of adsorbed or desorbed gas. Among them: low-pressure adsorption burette (small burette) volume 200 ±2 ml; high-pressure adsorption burette (large burette) volume 1000 ±5 ml;
3 leveling bottles; 2 gas sample bags; 2 spring clip clamps; 3 sets of glass three-way stopcocks; 1 hygrometer;
Aneroid barometer: model DYM3, measuring range 800–1060 hPa, minimum scale 1 hPa;
6. Monitoring System
Data acquisition instrument: used to obtain monitoring data from sensors;
Communication cables: input sensor monitoring data into the data acquisition instrument;
Data transmission cable: transmits monitoring data from the acquisition instrument to the host computer for analysis;
Analysis host: Huawei computer;
Software: adsorption experiment software.

Zhengzhou Aidi produces and supplies coal drill cuttings desorption instruments, deep-hole sampling devices, pressure gauges, geological exploration desorption instruments, borehole flowmeters, mine extraction and outburst prevention equipment, true density measuring instruments for coal, and gas content measuring instruments.