Humidity Sensors

Thin Film RTD Temperature Sensors Capacitive Humidity Sensors Mass Flow Sensors Conductivity Sensors Biosensors Application Development
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Capacitive RH Humidity SensorsMeasurement Principle

Capacitive RH sensors consist of a ceramic substrate on which a thin film of polymer is deposited between two conductive electrodes.

The sensing surface is coated with a micropourous metal electrode, allowing the polymer to absorb moisture while protecting it from contamination and exposure to condensation. As the polymer absorbs water, the dielectric constant changes incrementally and is nearly directly proportional to the relative humidity of the surrounding environment. Thus, by monitoring the change in capacitance, relative humidity can be derived.

Product Overview

IST thin film capacitive relative humidity sensors are capable of measuring 0 to 100% relative humidity and operating at temperature ranges of -80°C to +190°C.  The humidity sensor product line features sensors with excellent linearity, low hysteresis, fast response times, and high chemical resistance.

IST provides exclusive humidity sensors with directly integrated platinum temperature sensors that cater to a wide range of applications. A variety of different layouts and connections such as SMD and wired configurations are available.

Application Services

Need some help with your application development? Our technical teams can offer you consulting, development, and production assistance for your project.

Product Selection

Digital Calibrated Modules

Product
(Links to PDF)
Dimensions
(mm)
Sensor Type Temp Range
(°C)
Output Signal   Buy Online
HYT-271
(universal)
5.1 x 10.2 P14 -40 to 125 Digital (I2C or SPI)
HYT-221
(protection filter)
10.2 x 15.3 P14 -40 to 125 Digital (I2C or SPI) HYT-221
HYT-939
(compressed air)
5.2 x 9 P14 -40 to 125 Digital (I2C or SPI)
LinPicco Axxx 47 x 10 P14 SMD -25 to 85 10 to 90%
4 to 20 mA
0 to 1V / 5V
DigiPicco I2C 47 x 10 P14 SMD -25 to 85 Digital 12C  

Wired Capacitors

Product
(Links to PDF)
Dimensions
(mm)
Temp        
Range
(°C)
Capacitance
(pF)
Sensi-tivity
(pF/%RH)
Response
Time (s)
  Buy Online
P14 5 x 3.8 -50 to 150 150 +/- 50 0.25 < 5
P14 Rapid 5 x 3.8 -80 to 150 140 +/- 40 0.25 < 1.5  
MK33 10.8 x 3.8 -40 to 190 300 +/- 40 0.45 < 6 MK33
P14 2FW Thermo  5 x 3.8 -50 to 150 150 +/- 50 0.25 < 6    
K5 5 x 3.8 -40 to 150 200 +/-50 0.40 < 5    

SMD Capacitors

Product
(Links to PDF)
Dimensions
(mm)
Temp        Range
(°C)
Capacitance
(pF)
Sensi-
tivity
(pF/%RH)
Respnse
Time (s)
  Buy Online
P14 SMD 6.35 x 2.54 -50 to 150 180 +/- 50 0.3 < 5
P14 Rapid SMD 6.35 x 2.54 -80 to 150 180 +/- 50 0.3 < 1.5    
P14 FemtoCap 4 x 2 -50 to 150 180 +/- 50 0.3 < 3 P14 Femto Cap
Sensors in Tray