- 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
- Analogue 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.
Specifications
Sensor: single-Chip sensor for relative humidity and temperature with digital signal converting and chip calibration memory.
Relative Humidity
Resolution: 12 Bit
Characteristic: linear (digital linearization)
Response time: approx. 4 seconds (63% time, slightly moved air)
Long term stability: typical < 1 % RH per year
Standard sensor
Reproducibility: ± 0,1 % RH
Tolerance: ± 3,5 % RH at 30...70 % RH / ± 5,0 % RH at 00...29 % RH / ± 5,0 % RH at 71...100 % RH
Sensor with narrowed tolerance
Reproducibility: ± 0,1 % RH
Tolerance: ± 2,0 % RH at 10...90 % RH / ± 4,0 % RH at 00...09% RH / ± 4,0 % RH at 91...100 % RH
Temperature
Resolution: 14 Bit
Characteristic: linear
Response time: approx. 20 seconds
Standard sensor
Reproducibility: ± 0,1 % °C
Tolerance: ± 0,5 °C at 25 °C / ± 2,0 °C at -40 °C / ± 3,0 °C at +120 °C
Sensor with narrowed tolerance
Reproducibility: ± 0,1 % °C
Tolerance: ± 0,3 °C at 25 °C / ± 1,5 °C at -40 °C / ± 2,0 °C at +120 °C
Housing: Ultra mid with folding ABS cover, directly mounted sensor tube
Protection class: IP 54 according EN 60529; UL 94 HB
Dimensions: 95 x 70 x 54 [mm] (WxHxD)
Storage temperature: -25...+60 °C
Weight: approx. 300 g
Duct sensor: sensor tube of stainless steel, 11 mm Ø on the backside
Montage: wall-mounted
Operation temperature range:
sensor: -40...+120 °C
electronic: -10...+50 °C
Room sensor: sensor tube of stainless steel, 11 mm Ø on the frontside
Montage: wall-mounted
Operation temperature range:
Sensor: -40...+120 °C
Electronic: -10...+50 °C
Supply voltage: 15...30 Vdc; 24 Vac (±15%)
Power consumption: approx. 14 mA @ 24 Vdc at 0...10 V output
Display: two-line alphanumeric LCD display, 2x16 digit
Outputs: 0/2...10 V or 0/4...20 mA switchable via DIP-switch and jumper
Output 1: temperature
Output 2: one of four other measured variables selectable by a two-pole DIP-switch
Measuring range
temperature: TH= -30...+50 °C
relative humidity: RH= 0...100 %
dew point temperature: td = -30...+50 °C
wet bulb temperature: tf = -30...+50 °C
enthalpy: E = 0...200 kJ/kg
Special measuring range
Absolute humidity: a.F. = 0...50 g/kg
EMC: tested according EN 61000-6-2, EN 61000-6-3, CE mark