# Product Introduction
The FDM combustible gas detector is a high-performance device equipped with a built-in MCU and OLED display, and supports remote control operation. It is developed with DS4-LEL digital gas sensors, advanced very large-scale integrated circuit technology, and proprietary digital-analog hybrid communication technology. Featuring outstanding stability, high sensitivity, fast response speed and long service life, it also comes with communication and self-diagnosis functions as well as easy installation and maintenance. It fully demonstrates the superior performance of typical intelligent on-site monitoring instruments and well meets the demand for high-reliability equipment for safety monitoring in industrial sites.
# Product Specifications
FDM-LEL Combustible Gas Detector
# Product Features
- Multiple signal outputs: standard 4~20mA current signal, low-limit alarm relay output and standard RS485 interface
- OLED display, remote control operation, optional high-decibel audible and visual alarm; full-range adjustable alarm setpoints
- Full-range digital temperature compensation to ensure measurement accuracy
- Compatible with various remote control equipment such as PLCs, DCS systems, control alarm devices and secondary instruments
- Automatic sensor identification and real-time detection of gas chamber operating status
- Intrinsically safe circuit and explosion-proof housing design for safe, convenient and rapid on-site maintenance
# Advantages
- Ready for use without preheating
- Automatic self-identification function
- Convenient maintenance
- Accurate factory pre-calibration
- Sensor performance detection and fault alarm for sensor failure judgment
# Technical Parameters
## Detection Principle
Catalytic combustion gas detection technology
## Detection Mode
Online monitoring, diffusion type
## Signal Output
Simultaneous output of 4-20mA and RS485 signals (standard protocol or private protocol optional)
3-wire 4-20mA output connection cable: 3-core shielded cable
4-wire RS485 output connection cable: 4-core shielded cable
## Housing Material
Cast aluminum
## Flameproof Grade
ExdⅡCT6Gb
## Protection Grade
IP66
## Accuracy
± 5% F.S
## Operating Temperature
-40℃ ~ +60℃
## Operating Humidity
10% ~ 95% RH (non-condensing)
## Expected Sensor Service Life
More than 2 years
## Operating Voltage
24V DC
## Operating Current
Less than 100mA at 24V DC
## Relay Output
Passive switch output or active output (contact capacity: 24VDC@1A for active output)
## Overall Weight
1.14kg
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