Model NO.
SiH4/M(C)(S)-range-(S)
Type
Electrochemical Gas Sensor
Conductivity Type
Volume Control Type
Output Signal Type
Digital Type
Production Process
Integration
Material
Plastic
IP Rating
IP20
Sensitivity
High
Certification
RoHS
Customized
Customized
Output
TTL/4-20mA/RS485
Transmitter Board
Integrated/Seperated
Wire
Two or Three Wire
Detecting Range
Selectable
After Sale Service
Yes
Trademark
FAD
Transport Package
Transparent Plastic Box
Specification
20-41mm
Origin
China
HS Code
8542330000
FAD 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 Selection
| Detecting range (ppm)/Size | Miniature | Compact | Slim | Standard |
| 0-50 ppm | SiH4/M-50 | SiH4/C-50 | SiH4/S-50-S | SiH4/S-50 |
Sensor Performance Characteristics(take SiH4/C-50 as an example)
| Operation Principle | 3-Electrode Electrochemical |
| Nominal Range | 0 - 50 ppm |
| Maximum Overload | n.d. |
| Expected Operation Life | 2 years in air |
| Output Signal | 1200 ± 400 nA/ppm |
| Resolution (Electronics dependent) | <0.2 ppm |
| Temperature Range | -20 °C to 50 °C |
| Pressure Range | Atmospheric ±10% |
| Pressure Coefficient | No data |
| T90 Response Time | < 60 sec |
| Relative Humidity Range | 15 % to 90 % R.H. non-condensing 1) |
Typical Baseline Range (pure air, 20°C) | 0 ppm to -1 ppm |
| Maximum Zero Shift(20°C to +40°C) | N.D. |
| Typical Long Term Output Drift | N.D. |
| Recommended Load Resistor | 10 Ohm |
| Bias Voltage | Not recommended |
| Repeatability | < 2 % of signal |
| Output Linearity | Linear |
Sensor Physical Characteristics
| Weight | ~ 13 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 Data
| Interfering Gas | Concentration(ppm) | Reading(ppm) |
| CO | 200 | 0 |
| H2S | 5 | 8 |
| SO2 | 5 | 1 |
| H2 | 200 | 0 |
| PH3 | 2 | 2 |
Performance data conditions: 20 °C, 50% RH, 1013 mbar
Module Parameters
| Module 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
