AO-RDFT/A Humidity and Temperature Transducer with display for Ceiling Mounting View larger

AO-RDFT/A Humidity and Temperature Transducer with display for Ceiling Mounting




  • % r.H., g/m³, g/kg, DP °C
  • -30...+70°C, -20...+80°C, 0...+50°C, 0...+100°C
  • output 0-10 V, 4-20 mA

255,00 €

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The AO-RDFT/A humidity and temperature sensor measures the temperature and selectively the relative humidity, absolute humidity, air fuel ratio or dew point of the ambient air and transforms it to a linear output signal 0-10 V or 4-20 mA. The secondary measuring value is selectable from the 4 measurement categories % r.H., g/m³, g/kg, DP by a DIP switch. The unobtrusive housing with snap fastening and torque/pole-protected plug is suitable for quick mounting in suspended ceilings. The humidity and temperature transducer can be adjusted locally for fine calibration by an offset controller. In addition, the humidity measuring instrument has an integrated heating function for sensor protection in the high humidity range of 95...99% r.H. If the relative humidity exceeds the factory-preset threshold value for more than 10 minutes, this heating function is activated. Then the sensor will be temporally heated, thus dried respectively protected against condensation. During the heating and subsequent temperature compensation phase, the output signal is kept stable on the last measurement value before the protective function was activated.

Measurement range r.H. 0...100% r.H.
Measurement range abs. humidity 0...50 g/m³, 0...80 g/m³ (calculated) selectable by DIP switch
Measurement range air fuel ratio 0...50 g/kg, 0...80 g/kg (calculated) selectable by DIP switch
Measurement range dew point -20 up to +50°C DP, -20 up to +80°C DP, 0 up to +50°C DP (calculated) selectable by DIP switch
Measurement range temp. -30...+70°C, -20...+80°C, 0...+50°C, 0...+100°C selectable by DIP switch
Accuracy ±3% r.H. (30%...70% r.H., else ±5% r.H. at 20°C), ±0,3 K (10...40°C, else ±0,5 K)
Temperature dependency < 0,02% r.H. / °C (voltage output), < 0,04% r.H. / °C (current version); < 0,05°C / 10 K (voltage version), < 0,07°C / 10 K (current output)
Long term stability ±1%/year
Sensor capacitive humidity sensor
Sensor protection mounted inside housing, condensation protection by heating function in the range of 95...99% r.H.
Flow rate < 2 m/s
Supply voltage at 0-10 V 24 V AC/DC (±5%)
Supply voltage at 4-20 mA 15...36 V DC (Ubmin = 15 V + RLast*0,02A)
Current consumption at 0-10 V typ. 10 mA
Current consumption at 4-20 mA max. 20 mA
Analogue output 0-10 V 3-wire connection, load current <0,1 mA
Analogue output 4-20 mA 2-wire connection (transmitter), max. RLoad(Ohm) = (+Ub - 15 V) / 0,02 A
Electrical connection screw terminals max. 1,5 mm²
Cable 1 m shielded PVC cable
Housing Sensor: aluminium, colour signal white like RAL 9003, Electronic: polyamide with snap closing screws, colour white like RAL 9010
Cable gland PG11 high-strength cable gland with strain relief
Display optional LCD-Display, to display the actual humidity and temperature
Dimensions Housing: L 64 x W 58 x H 34,5 mm, Cable: 1 m PVC
Protection type Housing/electronic: IP65, Sensor: IP30
Protection class III
Working range r.H. 0...98% r.H. in contaminant-free, non-condensing air
Working temperature Probe: -20...+80°C, Electronic: -30...+70°C
Storage temperature -20...+50°C
Installation in the false ceiling by 2 tension springs
Approvals CE-conformity, EAC, RoHS