S220 Dew Point Sensor for Compressed Air (-100… +20 °C Td)

S220 Dew Point Sensor for Compressed Air (-100… +20 °C Td)

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Dew point measurements in high-tech applications

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Low maintenance costs due to stable measurements

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Polymer + QCM dual-sensor for highest accuracy

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Pressure sensor for pressure depending humidity units

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Flexible installation thanks to the compact design

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Display option for on-site readings or all values

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4 ... 20 mA 2-Draht / 3-Draht und Modbus/RTU

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Operating pressure of 0 ... 1.6 MPa (Optional 35.0 MPa)

The SUTO S220 Dew Point Sensor provides reliable and long-term stable dew point monitoring for compressed air and gases in industrial applications. The sensor has a range of -100 … +20 °C Td. This makes it an ideal choice for dew point measurements in high-tech industries and special conditions, where accordance to the compressed air quality ISO 8573-1 Standards is required.

State-of-the-art Dew Point Monitoring

The new generation of the SUTO dew point sensors have been redesigned from the ground up, offering compressed air users a plug & play solution to monitor their compressed air quality and purity. With the integrated pressure sensor, the S220 measures dew point, temperature and pressure in a single instrument.

Minimization of calibration intervals

Thanks to the reliable and long-term stable measurements, the S220 Dew Point Sensor reduces the maintenance cost to a minimum by increase calibration intervals.

Unique Triple Sensor

Our QCM sensor is the result of years of high-tech research and development. The sensor was especially designed for low dew point applications where other sensor types fail. The combination of QCM and the well-known Polymer sensor makes the S220 the world’s first model to measure accurate over the whole range, from -100 °C Td up to +20 °C Td by switching automatically between the two sensor elements as needed.

By fitting an additional optional pressure sensor into the measurement unit, SUTO is combining 4 sensor elements (Polymer, QCM, Pt100, pressure) into a single dew point sensor.

Various Output Connections

The S220 Dew Point Sensor is available with 2-wire or 3-wire analog 4… 20 mA output signals. It is also available with a Modbus/RTU digital interface.

By offering different output signals, users can profit from great flexibility and seamless integration into their process. They can be easily connected to the SUTO displays and data loggers S330/331 and S551, for optimal stationary or portable data logging, as well as to third-party devices.

Optional Display for On-site Values

The optional OLED display directly mounted on the sensor provides on-site real-time values. The display can be easily rotated by 340 ° to fit in any application. The display cover is made from robust Polycarbonate with ABS reinforcement to withstand harsh environments.

Robust Materials for Long-term Stable Measurements

The main body is made from high class aluminum alloy with a soft finish. The process connection material is 1.4301 (SUS 304) stainless steel, made to last forever. Top cover made from aluminum with the same quality as the main body.

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
SUTO Exchange Service

The exchange calibration service eliminates downtime and enables users to have a seamless record of their dew point measurements.

The user receives a calibrated instrument in advance with a calibration certificate and the same instrument settings. The onsite instrument is then switched with the calibrated one and returned to the supplier. Please find more information about our Exchange Service here.

Please contact us here for consultation or special requests, such as custom dew point ranges or different gas types.

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Full range sensor for high tech applications where high accuracy over the full range of -100… 20 °C Td is needed


Dew Point
Accuracy± 1 °C Td (0 ... 20 °C Td)
± 2 °C Td (-60 ... 0 °C Td)
Selectable units°C, °F, bar(g), MPa(g), psi(g), % rH, g/m³,
mg/m³, g/m³ atm., mg/m³
Measuring range-60 ... +20 °C Td
Repeatability0.25 % from measured value
Response time (t90)0 °C Td ➞ -60 °C Td ≤ 280 sec
-60 °C Td ➞ 0 °C Td ≤ 65 sec
@ 4 l/min
Accuracy0.5 % FS
Measuring range0 ... 1.6 MPa
SensorPiezo resistive type
Accuracy+/- 0.3 °C
Measuring range-30 ... +70 °C
Reference conditions
Selectable conditions20 °C 1000 mbar (ISO1217), 0 °C 1013 mbar (DIN1343) Freely adjustable


Analog output
Signal4 ... 20 mA 2-wire or
4 ... 20 mA 3-wire
Scaling4 mA = -60; 20 mA = +20 °C Td; freely adjustable
Update rate3/sec
Update rate1/sec
Voltage supply15 ... 30 VDC
Current consumption2-wire: 4 ... 20 mA
3-wire: 40 mA @ 24 VDC
3-wire with Display: 50 mA @ 24 VDC


PC SoftwareS4C-DP Application
Display (Optional)
Integrated0.66” OLED display, indicates the measured value and unit
Process connectionStainless steel 1.4301 (SUS 304)
HousingDisplay cover: PC + ABS
SensorPolymer + Quartz-Crystal
Metal partsSinter filter (stainless steel)
Electrical connectionM12, 5-pole
Protection classIP65
Process connectionG 1/2” (ISO 228/1)
Weight180 g
Operating conditions
MediumAir, Argon, O₂, N₂, CO₂*
Medium qualityISO 8573-1: 4.6.3 or better
Medium temperature-30 ... +70 °C
Medium humidity≤ 20 °C Td
Operating pressure0.1 ... 1.6 MPa
Ambient temperature0 ... +50 °C
Ambient humidity0 ... 100 % rH
Storage temperature-20 ... +50 °C
Transport temperature-30 ... +70 °C

S201/ S211/ S212/ S215/ S217/ S220/ S230/ S231/ S305/ S505/ S520 – CE & UKCA DECLARATION OF CONFORMITY

S201/ S211/ S212/ S215/ S217/ S220/ S230/ S231/ S305/ S505/ S520 – CE & UKCA DECLARATION OF CONFORMITY
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S211 / S215 / S220

S211 / S215 / S220
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S211 / S215 / S220

Info sheets
S211 / S215 / S220
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S4C-DP S2XX Service Software: V1.4

S4C-DP S2XX Service Software: V1.4
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Our humidity calculator offers a simple solution to calculate measurement-related parameters in terms of humidity, dew point, and more. From the drop-down menu, it is easy to select the input parameters, so humidity conversions can be executed vice versa, simply from one unit into another.

Go to Calculator

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