Duct humidity and temperature sensor active optionally with passive sensor

The KFTF with or without display is a humidity/temperature sensor which measures the relative or absolute humidity and the temperature of the air. It is used in refrigeration, ventilation, air conditioning and clean room technology, in greenhouses and halls and converts the measured variables humidity and temperature into a standard signal 0-10 V or 4…20mA. The housings are suitable for duct mounting.

Technical Data

Power supply:24V AC/DC ± 20% with output 0-10V
15-30 VDC ± 20% with output 4...20mA
Power consumption:0-10V type 5mA
Sensoren:kapazitiver Feuchtesensor, betauungsfest, kleine Hysterese, hohe Langzeitstabilität
Sensors:capacitive humidity sensor, dew resistant,
small hysteresis, high long-term stability
sensor protection:Membrane filter, replaceable
Humidity measuring range:adjustable: relative humidity 0...100% or
absolute humidity 0...80g/m³
Humidity deviation:relative humidity: ± 3% rH, (20...80%); at +20 °C,
otherwise ± 6% rH.
absolute humidity: results from measurement
errors of the rel. humidity and temperature
Output humidity:0-10 V for U-variant
4...20mA for I-variant (must be connected
otherwise no T output signal)
Temp. measuring range:0-10V or 4-20mA preset to
-20...+80 °C, other measuring ranges adjustable
0..+50 °C, 0...+80 °C, -35...+35 °C, -50...+50 °C,
-35...+75 °C
passive sensor see data sheets
Temperature deviation:± 0.4K at 20 °C, depending on installation
Temperature output:0-10 V or 4...20mA or Ohm value
Ambient temperature:0...+50°C
Humidity:< 95 % rH, non-condensing air
Connection head:ABS/ PC,
colour pure white (similar to RAL9010),
4 quick release screws
Dimensions:81 x 55 x 35 mm plus PG
Protective pipe:ABS/ PC,
colour pure white (similar to RAL9010),
EL=160mm, ø 16.5mm
Display (optional):LCD display
Electrical connection:2-, 3-, or 4-wire (see circuit diagram),
0.14- 1.5 mm²
via screw terminals on circuit board
Cable gland:M 16, with strain relief
Process connection:by means of ABS/PC mounting flange
Long-term stability:± 1 %/ 10 years
Protection class:III (according to EN 60 730)
Protection type:IP 65 (according to IEC 529)
Standards:CE conformity, electromagnetic
compatibility according to EN 61 326 +A1+A2,
EMV Directive 89/336/EWG


KFTF Display