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AO-RDF/A Humidity Transducer without display for Ceiling Mounting (0.. 100 rH)
- 0...100% r.H.
- accuracy ±3% r.H.
- output 0-10 V, 4-20 mA
- heating function for condensation protection
The AO-RDF/A humidity transducer measures the relative humidity 0...100% r.H. of the ambient air by a capacitive sensor and transforms it to a standardised output signal 0-10 V or 4-20 mA. The unobtrusive housing with snap fastening and torque/pole-protected plug is suitable for quick mounting in suspended ceilings. 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. The humidity transducer can be adjusted locally for fine calibration by an offset controller.
| Measurement range r.H. | 0...100% r.H. |
|---|---|
| Accuracy | ±3% r.H. (30%...70% r.H., else ±5% r.H. at 20°C) |
| Temperature dependency | < 0,02% r.H. / °C (voltage output), < 0,04% r.H. / °C (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 |
| 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 |
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