EA900-4/B Fixed Four-in-One Gas Detector

● Intrinsically safe circuit design, explosion-proof certification, secondary lightning protection and anti-static, with lightning protection and anti-static capabilities exceeding national standards, and resistance to high-intensity pulse surge current impact. High reliability and stability. Reverse connection prevention design, the instrument will not be damaged even if it is connected in reverse in any form. ● Standard infrared remote control, which can realize operation without opening the cover in dangerous occasions, such as: modifying alarm points, concentration calibration, zero point calibration, mute, restoring factory settings, entering the menu, viewing records, 4mA output, 20mA output (this function is required for calibrating other acquisition devices). ● Chinese and English interfaces are optional, with the default being Chinese interface. It supports free switching of gas concentration units. For conventional gases, there is no need to input molecular weight; for special gases, after inputting molecular weight, it will automatically calculate and switch. Optional units: PPM, mg/m3, Vol%, LEL%, PPHM, ppb, mg/L. ● 2.5-inch high-definition color screen (LCM) displays real-time concentration, time, temperature, humidity, storage status and other information. It can simultaneously detect 4 to 6 types of gas concentrations, temperature and humidity. The menu interface uses high-definition simulation icons to display the function names of each menu, with concise Chinese or English operation prompts. ● Three display modes can be switched: simultaneous display of multiple gas concentrations, large-font cyclic display of single-channel gas concentration, and real-time curve. Automatic or manual cycling between channels can be switched. It can be set to display maximum and minimum values, gas names, and historical record curves can be viewed. ● Automatically tracks zero points to prevent drift, with temperature compensation and multi-level calibration, and can meet the standards of national metrology bureaus and local/provincial metrology bureaus in various regions. ● Data recovery function, automatic identification and prevention of misoperation in concentration calibration, which can avoid problems caused by improper operation. ● Can record calibration logs, maintenance logs, and fault resolution countermeasures. It has functions such as sensor life expiration reminder and next concentration calibration time reminder. Technical Parameters Detected gases: Methane, hydrogen sulfide, carbon monoxide, oxygen Detection range: Methane 0-100%LEL, hydrogen sulfide 0-100PPM, carbon monoxide 0-500PPM, oxygen 0-30%VOL. Other ranges can be customized. Resolution: 0.1PPM, higher resolution can be customized. Temperature detection: -40℃~+120℃ (optional); Humidity detection: 0～100%RH (optional). Resolution: temperature 0.1℃, humidity 1%RH. Detection accuracy: ≤±2%F.S (≤2% within the full range), temperature 0.5℃, humidity: 3%RH, higher accuracy can be customized. Working method: Fixed installation, online detection, diffusion measurement, pipeline type, flow-through type, and pump suction type are optional. Installation method: Pipeline type, wall-mounted type. The working pressure of the pipeline type is atmospheric pressure ±30%, and pressure reduction treatment is required if the range is exceeded. Response time: T90≤20 seconds. Recovery time: ≤30 seconds. Output signal: Bus type RS485 (RTU), optional 3 (4)-wire system 4～20mA, 0～20mA, 1～5V, 0～5V, 0～10V, wireless transmission. Alarm method: Local audible and visual alarm (optional), default 1 channel, optional 3-channel dry contact (dry node) output, three-level alarm, and alarm points can be set. Working environment: -40℃～+70℃. Sample gas temperature: -40℃～+70℃ (conventional), optional: -40℃～+400℃, -40℃～+800℃ (maximum 1300℃). Relative humidity: ≤10-95%RH (conventional, non-condensing occasions), optional: 10-99%RH for high-temperature and high-humidity occasions, which needs to be specified when ordering and requires a pre-treatment system. Working voltage: 12~30V (DC, the standard power supply for a single device is 24V, 1A or a DC switching power supply with a current greater than 1A). Power supply reference: A 24V, 2.1A switching power supply can drive 40 toxic gas detectors or 15 combustible and infrared gas detectors. Explosion-proof type: Flameproof type ExdⅡCT6. Connection cable: 4~20mA uses a 3-core shielded cable, RS485 uses a 4-core cable. When the distance exceeds 1000 meters, the single wire diameter is ≥1.5mm; the shielding layer is connected to the ground. Electrical interface: 3/4NPT, optional M20X1.5 internal thread, 1/2NPT. Protection level: IP66, splash-proof and short-time rainproof. For long-time rain exposure, a rain cover is required, or a housing without a display is selected, or it is specified when ordering. Appearance size: 210×170×85mm. Weight: 1.8Kg.