JCB4气体检测仪是一种便携式甲烷检测报警设备，广泛适用于煤矿等存在甲烷气体的危险环境。该设备采用催化燃烧式传感器，测量范围为0.00%~4.00% CH4，测量精度高，0.00%~1.00%时误差范围为±0.10%，1.00%~3.00%时误差为真值的±10%，3.00%~4.00%时误差为±0.30%。仪器具有声光报警功能，报警声级强度可达80dB，报警光能见度大于20米，能够有效提醒工作人员及时采取措施。

JCB4气体检测仪采用坚固的工程塑料外壳，防护等级达到IP54，可在0℃~40℃的温度范围内以及湿度不超过98%的环境中正常工作。其尺寸为106mm×59mm×23.5mm，重量仅240g，便于携带。仪器配备3.7V可充电锰酸锂电池，连续工作时间大于10小时，还具备电池电压显示和电量不足报警功能，确保设备在关键时刻不会因电量问题而失效。

此外，JCB4气体检测仪还具备多种辅助功能，如全量程可调节报警点、24小时时间显示、零点调校、精度调校、时间调校和日期调校等，方便用户根据实际需求进行设置和校准。目前，JCB4气体检测仪的市场价格一般在500元左右，性价比高，是保障煤矿等危险环境作业人员安全的重要设备。

The JCB4 gas detector is a portable methane detection and alarm device, widely used in hazardous environments with methane gas, such as coal mines. Equipped with a catalytic combustion sensor, it has a measurement range of 0.00% to 4.00% CH4. The instrument offers high measurement accuracy, with an error range of ±0.10% for 0.00% to 1.00%, ±10% of the true value for 1.00% to 3.00%, and ±0.30% for 3.00% to 4.00%. It also features audible and visual alarm functions, with an alarm sound level intensity of up to 80dB and a visible distance of the alarm light greater than 20 meters, effectively alerting workers to take timely measures.

The JCB4 gas detector is housed in a robust engineering plastic casing, with a protection rating of IP54. It can operate normally in an environment with a temperature range of 0℃ to 40℃ and a humidity level not exceeding 98%. The device is compact, measuring 106mm×59mm×23.5mm, and weighs only 240g, making it easy to carry. Powered by a 3.7V rechargeable manganese acid lithium battery, it has a continuous working time of more than 10 hours. Additionally, it features battery voltage display and low battery alarm functions, ensuring that the device will not fail due to battery issues at critical moments.

Moreover, the JCB4 gas detector comes with various auxiliary functions, such as adjustable alarm points across the entire range, 24-hour time display, zero adjustment, precision adjustment, time adjustment, and date adjustment. These features allow users to set and calibrate the device according to their actual needs. Currently, the market price of the JCB4 gas detector is around 500 yuan, offering high cost-effectiveness. It is an essential device for ensuring the safety of workers in hazardous environments such as coal mines.