AO-RRFT(P)/A Temperature and Humidity Transducer with External Probe for pendulum sensors

Fuehler Systeme


% r.H., g/m³, g/kg, DP °C
-30...+70°C, -20...+80°C, 0...+50°C, 0...+100°C scales
outputs: 0-10 V, 4-20 mA, changer
heating function for condensation protection
hinge lock technology

Outputs to choose from:
     - Rel. Humidity: 2 x 4-20mA or 2 x 0-10V
     - Temperature: 2 x 4-20mA or 2 x 0-10V

265,00 €

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IP Classification IP65
The Sensor measures: Temp./Rel. Humidity
Output Signal: 0-10 V or 4-20 mA
Cable Length: 2m

The ao-RRFT(P)/A humidity and temperature transducer with pendulum sensor registers the temperature and, optionally, the relative humidity, absolute humidity, the mixing ratio or the dew point of the air in the environment and converts this measured value into a linear output signal 0-10 V respectively 4-20 mA.

Optionally the device has a potential-free changeover contact and a backlit display.
The changeover contact can be defined for one of the two measured values.

The units display content can be rotated in 90° steps using a menu and the measured value, the switching threshold set, the state of the respective relay, the MIN/MAX measured values for the selected intervals (1 h / 6 h / 12 h / 24 h) etc. can be read out. The value measured in addition to the temperature can be selected from the 4 parameters % r.h., g/m³, g/kg, dp can easily be selected per DIP switch.

The humidity measuring device has a heating function to protect the sensor at high humidity 95...99% r.h.. If the relative humidity exceeds the threshold value set ex-works for a certain period of time the heating function is activated.
The sensor is heated for a limited time and thus dried and protected against condensation. During the heating and the subsequent temperature balancing phase the output signal is kept stable at the last measured value before the heating function was triggered.

The humidity and temperature sensor is very well protected against contamination by a screwable sintered filter and can, if required, be finely calibrated in situ using an offset controller.

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 screwable stainless steel sinter filter, 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 2 m shielded PVC cable
Housing 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
Material Pendulum: brass nickel-plated
Dimensions Protection tube: Ø 16 x 60 mm
Protection type IP65
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 screw fastening
Approvals CE-conformity, EAC, RoHS

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