Smart gas sensor DS4

SO2H2SNH3

Overview
The DS4 digital gas sensor module by EC Sense is a compact, energy-efficient sensor module based on printed solid polymer electrochemical technology. Designed for industrial, IoT and portable applications, the DS4 integrates a microprocessor, high-precision ADC and on-board algorithms for low-power continuous monitoring with minimal maintenance. The module is factory pre-calibrated and requires no preheating.

Technology
The DS4 uses a solidified electrolyte printed polymer electrochemical cell with three precious-metal electrodes behind a porous membrane. This solid polymer design reduces leakage risk and improves stability and lifetime in high-humidity and extreme-temperature environments. Gas diffusion into the cell produces a current proportional to concentration.

Advanced features

• Built-in microprocessor, high-precision ADC and embedded algorithms
• Operating voltage: 3.3–12 V DC (5 V recommended); module supports wide range
• Operating temperature: -40 °C to +55 °C (no temperature compensation required)
• Low power consumption with configurable sleep/wake modes for battery/IoT devices
• No preheating required; fast response and excellent linearity
• Long-term zero stability and anti-poisoning design for consistent field performance
• Compact 4-series cylindrical industrial dimensions for easy integration
• RoHS compliant; intrinsic safety classification indicated (EX ia IIC T6 Ga)

Integration and data handling
The DS4 provides a UART digital output (3.3 V half-duplex single-bus mode) for straightforward interfacing with microcontrollers and IoT systems. Evaluation kits and test tools (UART or RS485 to USB) support scalable testing and bulk calibration workflows.

Calibration and accuracy
Each unit is factory gas-calibrated and calibration data is stored in the module's microprocessor for plug-and-play deployment. Diffusion-based factory calibration reproduces real-world conditions to improve field accuracy. Pump-suction systems may require secondary calibration depending on device parameters.

Built-in intelligence and serviceability

• Self-recognition: automatic identification of gas type and detection range
• Custom ID/encryption codes for unique sensor identification and reduced configuration errors
• Service-friendly: hot-swappable design, offline calibration protocols and factory reset to minimize downtime and exposure during maintenance

Certifications & compliance
Intrinsic safety classification (EX ia IIC T6 Ga) and RoHS compliance are indicated for use in demanding and hazardous-area applications.

Technical specifications

• Model: DS4
• Technology: Printed solid polymer electrochemical sensor with three electrodes and porous membrane
• Gas combinations / Measurement range / Resolution / Response time: see product datasheet
• Output: UART 3.3 V half-duplex single-bus mode
• Working voltage: 3.3 – 5 V DC (5 V recommended); module supports up to 12 V
• Operating temperature: -40 °C to +55 °C
• Operating humidity: 15 to 95% RH, non-condensing
• Weight (with sensor): 4.56 g
• Dimensions (with sensor): 21.2 x 20 x Ø18 mm
• Design: Compact 4-series cylindrical industrial dimensions
• Power modes: Low-power sleep/wake functionality suitable for IoT and battery applications
• Maintenance: Hot-swappable, offline calibration protocols and factory reset available
• Calibration: Factory pre-calibrated; calibration data stored in sensor microprocessor
• Anti-poisoning and long lifetime design; solidified electrolyte to avoid liquid leakage
• Certifications: Intrinsic safety EX ia IIC T6 Ga; RoHS compliant
• Warranty: 1 year