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, resisting high-intensity pulse surge current impact. High reliability and stability. Reverse connection prevention design, no damage to the instrument even in any reverse connection situation. ● Standard infrared remote control, enabling operation without opening the cover in dangerous occasions, such as modifying alarm points, concentration calibration, zero 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 the Chinese interface. It supports free switching of gas concentration units. For conventional gases, no molecular weight input is required; for special gases, after inputting the 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 show the function names of each menu, with concise Chinese or English operation prompts. ● Three display modes are switchable: simultaneous display of multiple gas concentrations, large-font cyclic display of single-channel gas concentration, real-time curve. Automatic or manual cycling between channels is switchable. It can be set to display maximum value, minimum value, gas name, and historical record curves can be viewed. ● Automatically tracks zero point to prevent drift, with temperature compensation and multi-level calibration, capable of meeting both national standards and local/provincial metrology bureau standards in various regions. ● Data recovery function, automatic identification and prevention of misoperation in concentration calibration, avoiding adverse effects caused by improper operation. ● Can record calibration logs, maintenance logs, fault resolution countermeasures, sensor life expiration reminders, and next concentration calibration time reminders. 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; pipe type, flow-through type, pump suction type are optional
Installation method: Pipe type, wall-mounted type. The working pressure of the pipe type is atmospheric pressure ±30%; pressure reduction treatment is required if exceeding the range
Response time: T90≤20 seconds
Recovery time: ≤30 seconds
Output signal: Bus type RS485 (RTU); optional 3 (4)-wire 4～20mA, 0～20mA, 1～5V, 0～5V, 0～10V, wireless transmission
Alarm method: On-site audible and visual alarm (optional), default 1 channel; optional 3-channel passive contact (dry node) output, three-level alarm, alarm points are adjustable
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); optional: 10-99%RH for high-temperature and high-humidity occasions (note when ordering, a pre-treatment system is required)
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 reference: A 24V, 2.1A switching power supply can drive 40 toxic gas detectors or 15 combustible/infrared gas detectors
Explosion-proof type: Flameproof type ExdⅡCT6
Connection cable: 3-core shielded cable for 4~20mA; 4-core cable for RS485; when the distance exceeds 1000 meters, the single wire diameter is ≥1.5mm; the shield layer is connected to the earth
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 optional, or a housing without display can be selected, or noted when ordering
Dimensions: 210×170×85mm
Weight: 1.8Kg