SUTO S220: Reliable Dew point measurement in High-Tech Applications with a range of -100 … +20 °C Td
The SUTO S220 Dew Point Sensor is a next-generation instrument designed for high-tech and demanding compressed air applications. With a combined Polymer + QCM sensing element, the S220 provides reliable, ultra-low dew point measurements down to -100 °C Td, making it ideal for critical drying processes and precision gas monitoring.
Key Features
- Dew point measurement range: -100 to +20 °C Td
- Industry-leading ±3 °C Td accuracy at extreme low dew points
- Automatic switching between Polymer and QCM sensors
- Output: 4 … 20 mA 2-wire + SDI; 4 … 20 mA 3-wire + SDI; 4 … 20 mA 3-wire +SDI; Modbus/ RTU
- Optional OLED display for real-time values
- Optional integrated pressure sensor – combining dew point, temperature and pressure monitoring into a single instrument
- Compact IP65-rated design for easy installation in tight spaces
- Multiple units: °C Td, ppmv, g/m³, % rH and more
- Measures Air, Oxygen (O₂), Nitrogen (N₂), Argon , CO₂ (For CO₂, factory configuration required)
Applications
- High-purity compressed air systems
- Dry gas monitoring in semiconductor, laboratory, and medical gas supply
- Inert gas systems (N₂, Ar, CO₂*)
-
ISO 8573 Class 1 dew point applications
Seamless Integration
The S211 Dew Point Sensor is perfectly suited to be integrated into process controls or high-level monitoring systems. Various output options are offered for a seamless integration: 4 … 20 mA 2-wire + SDI; 4 … 20 mA 3-wire + SDI; 4 … 20 mA 3-wire +; Modbus/ RTU. The S211 is easily connected to the SUTO S330/331 Displays / Data Logger as well as the SUTO Portable Data Logger S551.
SUTO Dew Point Sensor Series Comparison
| Model | S211 | S215 | S220 |
|---|---|---|---|
| Dew point | -60 … +20 °C Td | -20 … +50 °C Td | -100 … +20 °C Td |
| Temperature | -30 … +70 °C | -30 … +70 °C | -30 … +70 °C |
| Pressure | 0 … 1.6 MPa | 0 … 1.6 MPa | 0 … 1.6 MPa |
| Application | In desiccant dryers | In fridge dryers | In high-tech applications |
FAQ
What is dew point and why is it important?
Dew point is the temperature at which water vapour in a gas begins to condense into liquid. In compressed air systems, a low dew point means less moisture in the air, which is crucial to prevent corrosion, bacterial growth, and damage to sensitive equipment. Monitoring dew point ensures air quality meets ISO 8573 standards and protects downstream processes.
What is the typical calibration interval?
The SUTO S211 is designed for long-term stability, typically requiring calibration only once every 12 months depending on usage and environment. To minimise downtime, SUTO offers an exchange calibration service—where a freshly calibrated unit is sent in advance so you can swap and return the old one without interrupting operations.
Can I use this sensor with my SCADA system?
Yes. The S211 supports industry-standard output signals, including 4–20 mA and Modbus/RTU, allowing seamless integration with most SCADA systems, PLCs, and other monitoring platforms. It can be easily configured as part of a larger network using daisy-chain setups.
