Sulfur Dioxide (SO2) Sensor, 0-20ppm/2000ppm

SKU: SUCH-GAS-SO2

$174.55

● Detect gas: Sulfur dioxide (SO2) ● Rang: 0-20ppm/2000ppm ● RS485/4-20mA/10-5V/10-10V ● Measuring method: Imported sensor

Detection Range *
Output Signal *

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🕒 Delivery date: 6-12 days

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Overview
Specs
Application
FAQ
Reviews

Overview

This sulfur dioxide (SO₂) sensor utilizes imported sensing elements, offering selectable ranges of 0-20ppm or 0-2000ppm with rapid response. It supports multiple output signals including RS485, 4-20mA, 0-5V, and 0-10V, facilitating seamless integration into industrial control systems. The gas sensor requires only 5 minutes of warm-up time, features simple installation, and weighs just 0.5kg.

Feature

SO2 gas sensor feature

The core detection component utilizes a professional sulfur dioxide concentration sensor probe.
The sensor features a wide measurement range, high accuracy, excellent linearity, and broad versatility.
The gas sensor employs a highly sensitive electrochemical probe, offering superior precision and stability compared to traditional semiconductor probes.
Note: The sulfur dioxide sensor is designed for air detection. Customers should test it in the intended application environment to ensure it meets requirements.

Dimension (unit: mm)

SO2 gas sensor dimension

RS485 Single Connection

SO2 gas sensor rs485 single connection

This gas sensor can also be combined with multiple sensors on a single RS485 bus. Theoretically, one bus can connect up to 254 RS485 sensors. The other end can be connected to a PLC with a RS485 interface, linked to a microcontroller via a RS485 interface chip, or connected to a computer using a USB-to-485 adapter. Configuration and testing are performed using the sensor configuration tool provided by our company (only one device can be connected at a time when using this configuration software).

Wiring Diagram

Analog wiring

Item	Wire Color	Wire Color Description
Power Supply	Brown	Power supply positive terminal (10–30V DC)
Power Supply	Black	Power supply negative terminal
Communication	Yellow	Voltage/current output positive terminal
Communication	Blue	Voltage/current output positive terminal

When wiring the analog type, pay attention to the polarity of the signal lines. Do not reverse the polarity of the current/voltage signal lines.

RS485 wiring

Item	Wire Color	Wire Color Description
Power Supply	Brown	Power supply positive (10~30V DC)
Power Supply	Black	Power supply negative
Communication	Yellow	485-A
Communication	Blue	485-B

When wiring the RS485 type, ensure that the A and B lines are not reversed. Multiple devices on the bus must not have conflicting addresses.

Installation

SO2 gas sensor installation

Drill holes (6mm diameter) at the installation locations.
Insert expansion anchors into the holes.
Secure the base.
Attach the probe to the bracket.
Insert the bracket into the base.
Installation complete.

Specs

Power Supply	10-30V DC
Output Signal	RS485/4-20mA/10-5V/10-10V (optional)
Measuring Range	20ppm/2000ppm (optional)
Measuring Method	Imported sensor
Warm-up Time	≥5min
Working Pressure	90-110 kPa
Working Temperature	-20°C~50°C
Working Humidity	15%RH-90%RH non-condensing
Humidity Accuracy	≥3%RH (60%, 25°C)
Temperature Accuracy	≤0.5°C (25°C)
Response Time	20ppm: ≤45s
Response Time	2000ppm: ≤70s
Power Consumption	0.18W
SO2 Resolution	20ppm: 0.1ppm
SO2 Resolution	2000ppm: 1ppm
Stability	≤2% signal value/month
Zero Drift	20ppm: ≤±0.5ppm
Zero Drift	2000ppm: ≤±4ppm
Temperature Measurement Range	-40°C~80°C
Humidity Measurement Range	0-100%RH
Detection Accuracy	±5%FS/±10%
Repeatability	≤2%
Weight	0.5kg

Application

Sulfuric Acid Plant

Industrial Exhaust Gas Monitoring

Smelting Plant

FAQ

Q1: How does a sulfur dioxide sensor work? ❯

Sulfur dioxide sensors commonly utilize electrochemical principles. The sensor contains an electrolyte and electrodes. When SO₂ molecules in the air diffuse into the sensor, redox reactions occur at the electrodes, generating a current proportional to the gas concentration. This current is converted into a voltage or digital signal via circuitry and then output to the monitoring system.

Q2: In which fields are sulfur dioxide sensors typically applied? ❯

SO₂ sensors are primarily used for exhaust emission monitoring in industries such as thermal power plants, metallurgy, and petrochemicals, as well as for urban ambient air quality testing. They help enterprises monitor SO₂ concentrations in real time to prevent emissions exceeding regulatory limits. Additionally, these sensors are commonly used in laboratory analysis, hazardous gas detection in mining areas, and combustion monitoring in boiler rooms.

Q3: What is the lifespan of a sulfur dioxide sensor? ❯

The typical lifespan of an electrochemical SO₂ sensor ranges from 1.5 to 3 years, depending on the operating environment. Prolonged exposure to high SO₂ concentrations, high humidity, or highly corrosive conditions will shorten its lifespan. To extend service life, carefully control the operating environment, avoid excessive concentration spikes, and perform regular calibration and maintenance.

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Sulfur Dioxide (SO2) Sensor, 0-20ppm/2000ppm

Feature

Dimension (unit: mm)

RS485 Single Connection

Wiring Diagram

Installation

Sulfuric Acid Plant

Industrial Exhaust Gas Monitoring

Smelting Plant

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