The CJZ7/CJZ70 gas extraction comprehensive parameter meter is a portable instrument designed for simultaneously measuring the drilling gas concentration, flow rate, negative pressure, temperature, CO, O₂ and CO_2.

• Using patented technology, gas concentration, flow rate, negative pressure, temperature, O₂, CO, and CO₂can be measured simultaneously. The seven measurements can be completed in 3 minutes.
• Added O₂, CO, and CO₂monitoring function can effectively warn potential self-ignition risk of coal seam.
• Proximity matching technology of drilling holes simplify the measurement operation and improve the measurement efficiency.
• Circulated sampling method inside gas gives fast measuring speed and shows the real situation in the gas pumping pipeline.
• The instrument uses high-purity light source modulation technology which gives good monochromaticity and cannot be disturbed by other gas components and water vapor. It can detect the real gas concentration.
• The instrument, verified thousands of times, has excellent waterproof and dust-proof ability. It has self-cleaning function which can resist the impact of slime inside drainage pipeline. Automatic drainage function guarantees no damage to and well-functioning of the sensor element under harsh conditions.
• Innovated highly secured energy saving power circuit.
• Passed the Exia I Ma (Explosion-proof) certification.

• Flow rate:

(0.040~1.600) m³/min DN50: ±1.5%FS

(0.090~3.600) m³/min DN75: ±1.5%FS,

(2.5~100.0) m³/min DN300: ±1.5%FS

• CH₄ %: (0.00~1.00)% CH₄: ±0.05%CH₄, >(1.00~100.0)% CH₄: ±5.00% of true value
• Absolute pressure(kPa): (10.0~100.0) kPa: ±1.5%, >(100.0~200.0)kPa: ±1.5 kPa
• Temperature (℃): (-10.0~+50.0) ℃ ±1.0℃
• CO₂ %: (0.00~0.50)% CO₂: ±0.1% CO₂

(0.50~5.00)% CO₂: ±(0.5+5% of true value)% CO₂

• CO (10^-6 CO): (0~20)x10^-6 CO: ±2×10^-6 CO >(20~100) x10^-6 CO: ±4×10^-6 CO

>(100~500) x10^-6 CO: ±5% of measured value

>(500~1000) x10^-6 CO: ±6% of measured value

• O₂%: (0~5)% O₂ ±0.5; (>5.0~25.0)% O₂ ±3% FS
• Explosion-proof type: mining intrinsically safe (Explosion-proof sign: Exia I Ma)