Products: multi-parameter measuring CD4 gas is developed by our company which can simultaneously detect multiple continuous measurement of gas concentrations, the use of the most advanced sensors that maintain stability, anti-interference, maintenance-free and long life etc., but also avoids the disadvantages of the traditional principle of the detector, such as exposure to operational failure components susceptible to dust in the air and other substances covering parts or false alarms caused. When the environment is detected in the test gas concentration reaches or exceeds the preset alarm value, the detector immediately audible and vibration alarm to remind us to take timely safety measures. This product is suitable for real-time detection of mines or other places under the piping carbon monoxide, hydrogen sulfide, oxygen, methane and other gases, the staff make the appropriate countermeasures based on the concentration of the display in order to ensure the safety of the staff of the technical indicators: Gas Type Range Low Alarm Setting Range High Range Low alarm set alarm CH4 0 ~ 4.00% 0.5% CH4 ~ 4.00% CH4 1.00% CH4 H2S 0 ~ 100ppm 1ppm ~ 30ppm adjustable 10ppm CO 0 ~ 1000ppm 5ppm ~ 500ppm adjustable 24ppm O2 0.0 ~ 30% vol 5% vol ~ 20% vol adjustable 22% vol ~ 24% vol 19.5% vol high alarm point TWA STEL alarm alarm response time measurement range of 2.00% CH4 ± 0.10% CH4 T90 <20S 20ppm 10ppm 15ppm ± 3ppmH2S T90 <45S 200ppm 35ppm 200ppm ± 5ppmCO T90 <45S 23.5% vol ≤ ± 3.0% FSO2 T90 <35S Features: ◆ one-button operation, simple and reliable real-time battery voltage display ◆ ◆ ◆ provides real-time residual voltage interchangeable modular sensor ◆ nominal concentration adjustable ◆ high concentration of combustible gas sensor protection ◆ sound, light, vibration, triple alarm ◆ integrated data logging and alarm logging functions ◆ High waterproof, dustproof design ◆ automatic calibration function, reducing errors ◆ POST, integrated TWA , STEL alarm sensor life:? O2 sensor life: more than two and a half (working life) CO Sensor life:? more than two and a half (working life) H2S Sensor life:? more than two and a half (working life)