1. Product Overview
The SGA-700B is an upgraded high-precision diffusion-type gas sensor module based on SGA-700A, launched in 2018. It adopts a 5-pin simplified interface, and uses thickened pins and electroplating process to improve connection reliability and anti-oxidation ability. The internal circuit is optimized to enhance anti-interference performance. It retains ppb-level high precision, diffusion sampling and factory pre-calibration functions, and supports optional 4-20mA current output. This module is suitable for large-scale industrial matching and high-reliability high-precision gas monitoring projects.
2. Sensing Technology & Self-Cleaning System
The module matches electrochemical, catalytic combustion, infrared, PID and other mainstream sensing technologies according to monitoring gas types. It uses natural diffusion for gas sampling. The upgraded circuit and environmental compensation unit ensure stable signal transmission and anti-interference capability. There is no active self-cleaning system. The fully sealed electroplated shell and compact structure reduce dust accumulation. With good corrosion resistance, it can maintain stable performance under long-term industrial operating conditions with only simple routine maintenance.
3. Key Features & Competitive Advantages
The optimized circuit structure greatly improves anti-interference ability and overall operational stability. The 5-pin simplified interface simplifies wiring and assembly for mass production. It maintains ppb-level high precision to meet the detection demand of trace gases. Natural diffusion structure is simple, reliable and low maintenance. It provides standard 0-5V+TTL signals and optional 4-20mA current output for diverse industrial control systems. Thickened electroplated pins enhance conductivity, anti-oxidation and connection firmness. Full environmental compensation guarantees consistent measurement in variable environments. IP55 & intrinsic safety make it suitable for various industrial hazardous areas. Factory pre-calibration realizes plug and play and shortens customers’ R&D cycle.
4. Technical Specifications
| Parameter |
Specification |
| Product Type |
High Precision Diffusion Type |
| Release Year |
2018 |
| Pin Count |
5 pins |
| Diameter |
34.5 mm |
| Height |
30 mm |
| Pin Length |
5.5 mm |
| Pin Diameter |
1.5 mm |
| Surface Treatment |
Electroplate |
| Weight |
35 g |
| Detectable Gases |
Over 1000 kinds of combustible, toxic, volatile gases |
| Detection Principle |
Electrochemical, Catalytic Combustion, Infrared, PID, Semiconductor |
| Working Voltage |
5V ± 1% |
| Power Consumption |
Electrochemical: < 50 mA; Others: < 100 mA |
| Accuracy |
≤ ±3% F.S. |
| Resolution |
ppb-level |
| Response Time (T90) |
≤ 30 s |
| Repeatability |
≤ ±2% F.S. |
| Linear Error |
≤ ±2% F.S. |
| Zero Drift |
≤ ±1% F.S./Year |
| Working Temperature |
-20 °C ~ +50 °C |
| Working Humidity |
≤ 95% RH, non-condensing |
| Working Pressure |
86 ~ 106 KPa |
| Preheating Time |
30 s |
| Communication Parameter |
9600 bps, 8 data bits, 1 stop bit, no parity |
| Shell Material |
Aluminum Alloy |
| Protection Class |
IP55 |
| Explosion-proof Grade |
Intrinsically Safe |
| Standard Output |
0-5V Voltage + TTL Digital Signal |
| Optional Output |
24V 4-20mA Current Signal |
5. Applications
Applied to industrial online gas monitoring systems, high-precision air quality monitoring equipment, flue gas and waste gas detectors, petrochemical plant safety monitoring, environmental protection inspection devices and intelligent factory gas safety systems.
