Datasheet

DATA SHEET
Technical changes reserved
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DescriptionDescription
0141 0316-90 08/2013
Technical data
Humidity sensor KFS 33-LC
Measurement principle Capacitive polymer humidity sensor
Humidity
application range
0 ... 100 % relative humidity
(max. dew point 60 °C)
Nominal capacitance
330 pF ±20 pF
(at 23 °C and 55 % RH)
Temperature drift
0,16 pF / K (from 5 °C to 70 °C)
Temp. application range -40 ... +120 °C
Linearity
< ±2,0 % RH
(20 ... 90 % RF at 23 °C)
Slope 0,6 pF / % RH (20 ... 90 % RH)
tan. Delta < 0,02
Hysteresis ± 3 % RH
Response time < 15 sec
Frequency range 1 ... 100 kHz
Max. evaluation voltage < 5 Vpp ~ (without DC-component)
Dimensions 5,0 x 7,0 x 1,5 mm
Connection SIL-strip 2,54 mm
Article Art.-No.:
Humidity sensor KFS 33-LC
Capacitive humidity sensor
KFS 33-LC
Characteristic features
• Capacitive operating principle
• Mechanically robust
• Good linearity
• Dew formation resistant
• Very good price performance ratio
• Compact dimensions
• RoHS conformance
Areas of applications
• Consumer products, hygrometer, weather stations,
room humidity measurement
• HVAC (Heating, ventilation and air conditioning)
• Humidity regulator for sanitary exhaust,
airhumidiersandairdryers
• Medical applications
• Humidity measurement in vehicles
Features
The KFS 33-LC is a capacitive polymer-humidity sensor for general
commercial applications. Highlighting features are the extremely favou-
rable price-performance ratio, linear characteristics and good long-term
stability.
The physical measurement principle is based on the characteristics of
a hygroscopic material, which is used as the dielectric medium of a
capacitor.
The water content in the polymer maintains a equilibrium with the re-
lative humidity of atmosphere being measured. According to the water
content, the dielectric constant of dielectric medium changes the
E
r
- value and therefore the capacitance of the sensor. By virtue of its
constructional characteristics, the capacitance value almost linearly de-
pends on the value of relative humidity.
The high nominal capacitance of 330 pF and good sensitivity enables a
simple and stable evaluation electronics. The used polymer is resistant
against dew formation and usual household chemicals like detergents.
The sensor possesses a very good long-term stability and is ideally
suitable for price sensitive applications, like ventilation and air condi-
tioning.
We also supply calibrated humidity modules with voltage output for
simple integration with customised products.
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
Fon [phone] | Fax [phone] | [e-mail] | bb-sensors.com
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