Gas Module IntroductionFAD gas module with two/three wire TTL/0-20mA/RS485 output, integrates toxic gas sensor + transmitter board. Adopting imported advanced electrochemical gas sensors, it has features of high accuracy, long lifetime, high stability and high anti-interference. The module is designed to prevent circuit reversed connection, high voltage, high current and lightning. Gas Module Feature
- Long lifetime imported advanced electrochemical sensors- High accuracy op ams, power supply IC, stable and sensitive
- Detect low or high concentration toxic gases precisely
- High anti-interference ability
- Over range protection, reversed polarity protection and lightning protection
- Low power consumption with a standard 4-20mA two/three-wire signal output
- Interface: pump, diffusing, flange, flange thread types
- 12-36VDC operating voltage
Sensor Detecting Range SelectionDetecting range | Output Signal (nA/ppm) | Features |
NO2/S-20-S | 1100.00 ± 300.00 | highly sensitive |
NO2/S-500-S | 370.00 ± 70.00 | Emission Monitoring |
NO2/S-1000-S | 170.00 ± 30.00 | 2-electrodes sensor |
NO2/S-2000-S | 80.00 ± 20.00 | Emission Monitoring |
NO2/S-5000-S | 40.00 ± 10.00 | |
Sensor Performance Characteristics(take NO2/S-20-S as an example)Nominal Range | 0 - 20 ppm |
Maximum Overload | 200 ppm |
Expected Operation Life | 2 years in air |
Output Signal | - 1100 ± 300 nA/ppm |
Resolution | 0.1 ppm |
Temperature Range | -20 °C to 45 °C |
Pressure Range | Atmospheric ±10% |
Pressure Coefficient | No data |
T90 Response Time | < 60 sec |
Relative Humidity Range | 15 % to 90 % R.H. non-condensing |
Typical Baseline Range (pure air, 20°C) | <0.1 ppm |
Maximum Zero Shift(20°C to +40°C) | - 0.2 ppm |
Typical Long Term Output Drift | < 2 % signal loss/month |
Recommended Load Resistor | 10- 33 Ohm |
Bias Voltage | Not required |
Repeatability | < 2 % of signal |
Output Linearity | Linear |
Sensor Physical CharacteristicsWeight | ~ 27 g |
Position Sensitivity | None |
Storage Life | Six months in container |
Recommended Storage Temperature | 5 °C - 20 °C |
Warranty Period | 12 months from date of dispatch |
Sensor Cross-sensitivity DataInterfering Gas | Concentration(ppm) | Reading(ppm) |
CO | 300 | 0 |
SO2 | 5 | 0 |
NO | 35 | 0* |
H2 | 300 | 0 |
Ethylene | 100 | 0 |
(*)NO readily forms NO2 in the presence of oxygen
Performance data conditions: 20 °C, 50% RH, 1013 mbar Module ParametersModule type | GM-I2(3)-M/C/S-**-****/G/P/F/FL |
Detected gas | Toxic gas |
Detecting principle | Electrochemistry |
Sampling | Diffusing pump flange thread |
Responding time | 30s~40s(of the sensor) |
Module accuracy | ≤±3%FS(actual concentration, higher accuracy depends on specified sensors) |
Module repeatability | ≤±2% FS |
Module linear error | ≤±2% FS |
Module zero temperature drift | ≤±2% (FS/year) |
Module operating temperature | -40~80°C |
Module humidity | 0-95%RH(non-condensation) |
Sensor operating temperature | -20°C~50°C |
Sensor humidity | 0-90%RH(non-condensation) |
Signal output | TTL/4-20mA /RS485 (two or three wire) |
Transmitting distance | 1000 meters(RS485) |
Operating voltage | DC 12-36V |
Maximum power | ≤0.8W |
Size | 80*48mm |
Explosion proof | Intrinsic safe |
Connection cable | RVVP3 x 1.5mm² |
Module applications
Petroleum, petrochemical, metallurgy, chemical, electricity, telecom, gas, mining, pharmacy, municipal wastewater treatment, indoor environment, atmospheric environmental protection, transit equipment, transportation facilities, tunnel safety and underground parking, leak detection, safety and environmental control