Climate transmitter PFT25

Measuring temperature and relative humidity with a „single-chip“-sensor
Fast response time
Digital transmission from sensor to the evaluation electronics
Additional computed values: dew point temperature, absolute humidity, wet bulb temperature and enthalpy
Analog outputs 0…10 V or 4…20 mA
Sensor interchangeability without need for re-calibration
Protection class IP 65

The climate transmitter PFT25 converts the directly measured values temperature and relative humidity into often used climatic values dew point temperature, absolute humidity, wet bulb temperature and enthalpy by digital calculation. The device has two analog outputs, output 1 is always set to temperature, whilst the second output can be set to 4 further values by a two stage dip-switch. The design of the PFT25 corresponds to the transmitter PFT22.

All measured and calculated values are shown with a resolution of 12 bits. For the calculation, a mean air pressure of 1000 hPa is used. To achieve maximum accuracy, the location of medium height and air pressure are given on the spot.

Operating mode:
Messuring mode
Temperature and Humidity
Single-chip sensor for humidity and temperature with digital signal transmission and calibration memory on the chip
Measuring unit:
Output signal 1:
Relative humidity, Dew point, wet bulb temperature, enthalpy
Output signal 2:

(Special range – absolute humidity)

14 bit
Response time:
Approx. 20 seconds
± 0,1 °C
±0,5 °C at 25 °C; ±2 °C at -40 °C, ±3 °C at +120 °C; narrower tolerance possible
Measuring ranges:
-30…+50 °C

12 bit
Response time:
Aprox. 4 seconds (63 %-time, slightly moving air)
Typical < 1 % r.h. / year
± 0,1 % r.h.
Measuring ranges:

Temperature:T = -30…+50°C, 0…50°C, 0…100°C;
Relative humidity:  r.h. = 0…100%
Dew point: dp = -30…+50 °C
Wet bulb temperature:  wbt = -30…+50 °C
Enthalpy:  E = 0…200 kJ/kg;
Absolute humidity:a.h. = 0…50 g/kg

Measuring range:
4 selectable measuring ranges via DIP switch
Linear (digital linearization)

See drawings

Connections head:
Plastic ABS

Electrical connection:
7 Connection terminals

Version differences:

Channel sensor:
Sensor tube: stainless steel, 11 mm ø
Protection class: IP 65 according to EN 60529
Cable gland: M16 x 1.5
Outdoor sensor:Sensor tube: double-walled sensor tube with wall holder
Protection class: IP 65 according to EN 60529
Cable gland: M16x1.5
Room sensor:Plastic housing for mounting on a flush-mounted switch box or surface-mounted wall mounting

Power supply:
15 … 30 Vdc or 24 Vac in three-wire circuit;
13 … 30 Vdc in two-wire circuit

Output current:
2 x 0 … 10 V in three-wire circuit;
2 x 4 … 20 mA in two-wire circuit

EN 61000-6-2, EN 61000-6-3, CE-mark
according RoHS-directive 2011/65/EU

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