Overview

The Sense solid polymer electrochemical technology is a revolutionary innovation in the field of electrochemical detection. This technology is based on the principle of electrochemical catalytic reaction, detecting the output signals of the electrochemical reactions of different gases and accurately measuring the gas concentration through the signal. The sensor is composed of three electrodes in contact with the electrolyte. A typical electrode consists of a large surface area of noble metal and other materials. The electrode, electrolyte, and the surrounding air are in contact, and the gas diffuses into the working electrode. Here, the gas will be oxidized, which causes a current, which is proportional to the gas concentration.

Features

Advanced Solid Polymer Electrochemical Technology – ensures precise and reliable gas detection.
High Sensitivity & Accuracy – detects H₂S as low as 1 ppm with ±5% F.S error.
Fast Response Time – reacts in less than 3 seconds for instant hazard alerts.
Stable & Repeatable Performance – full-range repeatability of ±1% for consistent readings.
Durable Sensor Design – built with three electrodes and a noble metal catalyst for long-term stability.
Efficient Signal Processing – 3.3V UART digital output with standard communication protocol.
Low Power Consumption – ultra-low current (<5 mA) with power-saving sleep mode.
Compact & Lightweight – small form factor (23 × 25.5 × 10.2 mm) and only 3.1 g weight.
Wide Working Range – operates reliably between -20°C to +55°C and 15–95% RH.
Trusted Calibration – factory-calibrated with 100 ppm H₂S for high reliability.
Industrial-Grade Reliability – proven safety against odor, toxicity, and high-concentration exposure.

Technical Specifications

Principle	Solid Polymer Electrochemical Sensing Technology
Type	Digital Gas Detector, Portable Gas Detector, Other, H₂S Detector
Gas Detected	H₂S Hydrogen Sulfide Gas
Detection Range	0–100 ppm (Display resolution: 0.1 ppm)
Lowest Detection Limit	1 ppm
Full-Scale Accuracy Error	±5% F.S
Resolution	0.1 ppm
Response Time	< 3 seconds (T50: < 40s; T90: < 80s; T100: < 180s)
Time To Zero	50 ppm return to zero (<0.03 ppm) < 80s; 100 ppm return to zero (<0.03 ppm) < 120s
Calibration Substance	100 ppm H₂S gas calibration
Warm-Up Time	Clean air: <120s; Non-clean air: <240s
Physical & Chemical Hazards	Trace odor at 0.1–10 ppm (unpleasant odor); Irritation & toxicity above 10 ppm; Olfactory paralysis above 50 ppm; Danger of poisoning above 100 ppm
Output	3.3V UART digital signal (VCC: red, GND: black, RX: yellow, TX: green)
Communication Protocol	Baud rate: 9600; Data bits: 8; Stop bits: 1
Get Data Command	Active upload; Q & A mode (default). Can switch between modes.
Working Voltage	3.3 – 5.5V DC
Working Current	< 5 mA
Power Consumption	Sleeping mode: 25 mW @ 5V; Q&A mode active
Repeatability	Full range 100 ppm ± 1%
Working Temperature	-4.0000°F to 131.00°F (-20°C to +55°C)
Optimal Working Temperature	68.000°F to 95.000°F (20°C to 35°C)
Working Humidity	15% – 95% RH (non-condensing)
Optimum Working Humidity	50% RH
Working Pressure	Atmospheric ±10%
Board Size (With Sensor)	0.905511811× 1.0039370079 × 0.4015748031 inch
Board Size (Without Sensor)	0.905511811× 1.0039370079 × 0.1909448819 inch
Weight	0.0068343301 pounds