Climate transmitter PFT28 series

Measuring temperature and relative humidity with a „single-chip“-sensor
Calculation and display of dew point temperature, enthalpy, wet bulb temperature and absolute humidity
Digital transmission from sensor to the evaluation electronics
Fast response time
Exchange ability of sensor without recalibration
Alphanumeric LCD-indicator for: temperature, relative humidity, dew point temperature, absolute humidity, wet bulb temperature and enthalpy
Analog outputs 0/2…10 V or 0/4…20 mA
Supply voltage 15…30 Vdc or 24 Vac
Operational use humidity 0…100 % (transient condensation possible)
Operational use temperature -30…+50 °C
Plastic housing, protection class IP 54; UL 94 HB

The transmitter PFT28 converts the measured variables temperature and relative humidity into the measured variables: dew point temperature, absolute humidity, wet bulb temperature and enthalpy.

Output 1 supplies the temperature signal while Output 2 can be assigned to one of four other measured variables. The second measured variable is selected by a two-pole DIP switch.

Measured variable, measured value and unit are displayed on a two-line alphanumeric display.

Two PFT28 versions are available:
A room sensor for wall mounting and a duct sensor for installation in a ventilation duct. In both versions, the sensor tube is mounted directly to the chassis. With a jumper, the output signals can be switched from 0/2…10 V to 0/4…20 mA. The device is powered with 15…30 Vdc or 24 Vac.

Operating mode:
Messuring mode
Temperature and Humidity
Single-chip humidity and temperature sensor with digital signal transmission and calibration memory on the chip
Measuring unit:
Temperature in °C; relative humidity in %
Output signal 1:
Output signal 2:
Relative humidity, dew point, wet bulb temperature, enthalpy; (Special – Absoulte humidity)

14 bit
Response time:
Approx. 20 seconds

Standard SensorSensor with narrower tolerance
±0,1 °C±0,1 °C


Standard SensorSensor with narrower tolerance
±0,1 °C±0,1 °C
±0,5 °C at 25 °C ±0,3 °C at 25 °C
±2,0 °C at -40 °C±1,5 °C at -40 °C
±3,0 °C at +120 °C±2,0 °C at +120 °C

Measuring ranges:
-30 bis +50 °C

12 bit
Response time:
Approx. 4 seconds (63 %-time, slightly moving air)
Linear (digital linearization)
Long-term stability:
Typical < 1 % r.h. / year

Standard SensorSensor with narrower tolerance:
±0,1 % r.h.±0,1 % r.h.


Standard SensorSensor with narrower tolerance:
±0,1 % r.h.±0,1 % r.h.
±3,5 % r.h. at 30…70 % r.h. ±2,0 % r.h. at 10…90 % r.h.
±5,0 % r.h. at 0…29 % r.h.±4,0 % r.F. at 0…9 % r.h.
±5,0 % r.F. at 71…100 % r.h.±4,0 % r.F. at 91…100 % 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;

Special measuring range:
Absolute humidity: a.h. = 0…50 g/kg

Measuring range selection:
4 selectable measuring ranges via DIP switch

Ultramid with hinged ABS cover; Attached sensor tube for recording the sensor

Protection class:
IP 54 according to EN 60529; UL 94 HB

95 x 70 x 54 [mm] (WxHxD)

Approx. 300 g

Storage temperature:
-25…+60 °C

Operating temperature:
Sensor: -40…+120 °C
Electronics: -10…+50 °C

Kunststoff ABS

Connection head:
Plastic ABS

Electrical connection:
7 Connection terminals
Version differences:

Channel sensor:
Sensor tube: stainless steel, 11 mm ø
Cable gland: M16 x 1.5
Mounting flange for attachment to the duct
Outdoor sensor:Sensor tube: double-walled sensor tube with wall holder
Cable gland: M16 x 1.5
Mounting on the wall
Room sensor:Plastic housing for mounting on a flush-mounted switch box or surface-mounted wall mounting

Power supply:
15…30 Vdc; 24 Vac (±15%)

Output current:
0/2…10 V or 0/4…20 mA with DIP switch and jumper

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

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