S215 Dew Point Sensor for Fridge Dryers (-20… +50 °C Td)

Long term-stable dew point measurement in fridge dryer applications, with a range of -20 … +50 °C Td.

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Reliable dew point monitoring after fridge dryers

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Low maintenance costs due to stable measurements

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Pressure sensor integrated as option for

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Compact display for live readings at the sensor

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Compressed air quality monitoring of humidity

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Flexible installation due to the compact design

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4 ... 20 mA 2-wire / 3-wire and Modbus/RTU

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

The SUTO S215 Dew Point Sensor provides reliable dew point monitoring in industrial applications, with long-term stability and high accuracy over the full range of -20 … +50 °C Td. Along with its compact design, this makes it the ideal solution for compressed air and gas dew point measurements in refrigeration dryers.

Dew Point Monitoring According to ISO 8573-1

The plug-and-play dew point solution monitors the compressed air quality and purity according to the ISO 8573-1 standard. Meeting these requirements helps ensure fridge-dryer efficiency and reliability.

Output Signals for Great Flexibility

The dew point transmitter is available with 2-wire or 3-wire analog 4… 20 mA output signals, as well as Modbus/RTU digital interface. By offering various output signals, the sensor can be integrated seamlessly into any process.

Modbus Sensor Network with S331

The Modbus/RTU bus allows connecting several devices to a single bus line via Daisy-Chain. For example, up to 16 devices to a STUO Data Logger S331. The S331 is a powerful yet cost-efficient data logger and display solution.

Pressure Sensor and OLED Display

The S215 is offered with an integrated pressure sensor, combining a pressure and dew point sensor into a single instrument. The optional OLED display directly mounted on the sensor provides real-time values at the point of use. The display can be rotated by 340 ° to fit in any application. (Not available with 2-wire option)

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 SUTO 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 to the calibrated one and returned to the supplier. Find more information about our SUTO Exchange Service. Please contact us for special requests, such as custom dew point ranges or different gas types or applications.

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Fridge drier applications where dew points in the range of -20… +50 °C Td must be measured


Dew Point
Accuracy± 1 °C Td (0 ... 50 °C Td)
± 2 °C Td (-20 ... 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-20 ... +50 °C Td
Repeatability0.25 % from measured value
Response time (t90)0 °C Td ➞ -20 °C Td ≤ 50 sec
-20 °C Td ➞ 0 °C Td ≤ 35 sec
@ 4 l/min
Accuracy0.5 % FS
Measuring range0 ... 1.6 MPa
Accuracy+/- 0.3 °C
Measuring range-30 ... +70 °C
Reference conditions
Wählbare Bedingungen20 °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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