An LEL Monitor is an instrument used to detect hazardous levels of a combustible gas, expressed in % LEL, or Lower Explosive Limit. An LEL Monitor is also referred to as an LEL Gas Detection System, LEL Gas Detector or simply a fixed gas detection system. is your source for LEL safety to buy only the best LEL monitors and LEL analyzers for the commercial and industrial sectors.

Product Description

The online combustible gas concentration detector SK/MIC-600-EX is suitable for real-time and accurate detection of gas concentration and leakage in various environments. It uses imported catalytic combustion, infrared sensor and microcontroller technology. It has fast response speed and measurement accuracy. High, stability and repeatability. The explosion-proof wiring method is suitable for various dangerous places, and is compatible with various control alarms, PLC, DCS and other control systems. It can simultaneously realize on-site alarm and early warning, 4-20mA standard signal output, Relay switching output.

Signal Output

①4-20mA signal: standard 12-bit precision 4-20mA output chip, transmission distance 1Km

②RS485 signal: using standard MODBUS RTU protocol, transmission distance 1Km

③Voltage signal: 0.4-2V, 0-5V, 0-10V output, optional (choose one of voltage output or current output)

④Switching signal: Standard configuration is 1 set of passive contact relay, capacity 220VAC3AV/24VDC3A

Precision：±3%F.S
Working Temp：-20 ～ 50℃
Storage Temp：-20 ～ 50℃
Working Current：≤50mA
Working Voltage：DC5V±1%/DC24±1%
Installation：Wall-mounted, pipe, ceiling, bracket installation
Size：220*205*97（L*W*H）1.5Kg
IP Grade：IP66 Protect against splashing water and short periods of rain
Response Time：T90<10S
Humidity：0-95%RH
Warm-up Time：10S
Working Pressure：86kpa-106kpa
Baud Rate：9600
Warranty：1year
Service Life:3-5years
Explosion-proof：E x d I IC T 6

Receiving Equipment：pc, control alarm, PLC, DCS, DDC system
Alarm Code：On-site sound and light alarm, external alarm, remote controller alarm, computer data collection software alarm, etc.

Feature

●Intrinsically safe circuit design, explosion-proof certification, secondary lightning protection, anti-static, lightning protection and anti-static capabilities exceed national standards, and can withstand high-intensity pulse surge current impacts. High reliability and stability.

●Standard bus RS485 and 4~20mA standard signals are output simultaneously, 1 set of relay switching output, optional frequency output 200-1000Hz, 1~5V output, wireless transmission (10-50 kilometers or unlimited distance). It can be wired or wireless remote real-time monitoring, and the data can be uploaded to a mobile phone or transmitted to the Environmental Protection Bureau, other monitoring centers, monitoring equipment, and monitoring computers through LAN or the Internet, and the on-site concentration can be monitored in real time through free host computer software or gas alarm controllers.

●It is compatible with various secondary meters, data acquisition modules, PLC, and DCS systems. It can directly drive solenoid valves, fans, alarms and other equipment, and can also drive high-power equipment by driving intermediate relays.

●The standard infrared remote control enables operation without opening the cover in dangerous situations.

●2.5-inch high-definition color screen (TF) displays real-time concentration, temperature, humidity.

●Automatically tracks zero point to prevent drift, temperature compensation, multi-level calibration, and can comply with national standards and local and provincial metrology bureau standards in various regions.

Application Scenarios

Petroleum and petrochemical, chemical plants, smelting plants, steel plants, coal plants, thermal power plants, medical research, pharmaceutical production workshops, tobacco companies, environmental monitoring, school scientific research, building construction, fire alarms, sewage treatment, industrial gas process control, boiler rooms, Waste treatment plants, tunnel construction, oil pipelines, gas stations, underground gas pipeline maintenance, indoor air quality testing, hazardous site safety protection, aerospace, military equipment monitoring, etc.

Configuration list

Instrument Size

Interface Display:

The instrument has a total of 3 buttons, namely "Add/Cancel", "Function/Confirm", "Move Right/Move Down" (hereinafter referred to as "Add" ("Cancel"), "Function" ("Confirm"), "Shift Right" ("Shift Left")). The three button locations are as follows. Just press the "Function" button.

Internal diagram of the detector

Online combustible gas concentration detector can be used as a stand-alone machine, or connect to the management control machine for use.

4-20mA Circuit Diagram

RS485 Circuit Diagram

Installation Location:

According to the specific gravity and wind direction of the gas, the detector should be installed within one meter from the possible gas leakage location, so that the actual response speed of the detector is relatively fast. Otherwise, there may be an inconsistent concentration of flammable gas or toxic and harmful gases where the detector is installed. exceeds the standard, but the local gas at the leak point has exceeded the standard, but the detector and host cannot alarm.

The detector should be installed at a height greater than 30 cm from the ground to prevent water from splashing in. Under normal circumstances, to detect harmful gases with a specific gravity less than that of air, the probe should be installed above the house or equipment; for harmful gases with a specific gravity greater than that of air, the probe should be installed close to the ground. The detector should be installed with the probe facing downwards. If it is installed outdoors, a rain shield should be installed above the detector.

Note: The detection range of each probe in the open area is 60 square meters, and gas expansion must also be considered.Factors such as dispersion, wind direction, temperature, humidity and area closure. Protection measures such as dustproof, waterproof and high temperature protection should also be considered during installation.

Installation Method

Users can design their own fixing methods. But be careful to keep the sensor surface of the probe vertical to the ground. After the probe is fixed, remove the screws on the upper cover of the housing and insert the shielded (three-core 3×1.5mm) transmission cable through the cable passage. It is recommended to use shielded soft-core (three-core 3×1.5mm) cable and connect the cable to the terminal position. After checking that the wiring is secure, secure the cables and the upper cover of the housing.