# Product Introduction
The FDM ammonia gas detector is a high-performance device equipped with a built-in MCU and OLED display, and supports remote control operation. It is developed adopting the DS4 intelligent gas sensor, advanced very large-scale integration (VLSI) circuit technology, proprietary digital-analog hybrid communication and other technologies. Featuring outstanding stability, high sensitivity, fast response speed and long service life, it is integrated with communication and self-diagnosis functions and enables easy installation and maintenance. It fully demonstrates the advanced performance of typical intelligent on-site monitoring instruments, and thoroughly meets the demand for high-reliability equipment in industrial site safety monitoring.
# Product Specifications
FDM-NH3 Ammonia Gas Detector
## Features
- Multiple signal outputs: standard 4~20mA current output, low-limit alarm relay output and standard RS485 interface
- OLED display, remote control operation, optional high-decibel audible and visual alarm, fully adjustable alarm points across the entire measuring range
- Full-range digital temperature compensation to ensure measurement accuracy
- Compatible with various remote control equipment including PLC, DCS, control alarms, secondary instruments, etc.
- Automatically identifies the sensor and real-timely monitors the operating status of the gas chamber
- Intrinsically safe circuit and explosion-proof housing design for safe, convenient and rapid on-site maintenance
## Advantages
- Ready for use without preheating
- Automatic sensor identification function
- Easy maintenance
- Precise factory pre-calibration
- Sensor performance detection and fault alarm for sensor failure judgment
## Technical Parameters
### Detection Principle
Solid polymer electrochemical gas sensing technology
### Detection Mode
Online monitoring, diffusion sampling
### Signal Output
Simultaneous 4-20mA and RS485 signal output (standard protocol or private protocol optional)
3-wire 4-20mA output connecting cable: 3-core shielded cable
4-wire RS485 output connecting 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 3 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
Tech Support
User Reviews
