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Rotronic Hygro Flex 3 Transmitters For Humidity and Temperature

Transmitters For Humidity and Temperature
Hygro Flex 3

The new HygroFlex3-series is the latest development in HVAC transmitters for relative humidity, temperature and dew point. Based on AirChip3000 technology, the instruments achieve a degree of accuracy not seen before.

In combination with advances in sensor technology and integration, the HygroFlex3-series provides superb precision and state-of-the-art functionality, taking humidity, temperature and dew point measurements to a whole new level of performance and reliability (< 2 % rh / 0.3 K).

High flexibility
• Two freely selectable and scalable analog outputs
• Analog outputs assignable to relative humidity, temperature or dew point
• 2-wire or 3/4-wire systems available
• Two integrated relay contacts available as options to convert the transmitters to thermostats/hygrostats

• Compensates humidity and temperature over 30,000 reference points
• 2,000 data point memory
• Dew/frost point calculation
• Sensor auto-diagnostics and automatic correction
• Active alarming and information
• ASIC (Application Specific Integrated Circuit), micro-controller and EEPROM on one chip

Fast response and precision measurement
• By decoupling the Pt100 temperature sensor from the probe, thermal response is significantly improved
• Use of Pt100 1/3 Class B sensors for maximum accuracy

• Relative humidity, temperature and dew point measurement
• Outstanding accuracy and repeatability
• Hygromer® IN-1 humidity sensor
• Auto-diagnostics and automatic correction
• Freely selectable and scalable analog outputs
• Also available as hygrostat and thermostat

Integrated sensors Yes
Humidity sensor ROTRONIC Hygromer® IN-1
Temperature sensor Pt100 1/3 Class B
Accuracy at 23 ±5 °C ±2.0 %rh / 0.3 K (±1.0 %rh / 0.2 K Type R)
Resolution AirChip3000 <0.02 %rh / 0.01 K
Long-term stability humidity sensor <1 %rh / year
Response time τ 63 <10 s
Measurement range -40…60 °C / 0…100 %rh
Electronics operating range -40…60 °C / 0…100 %rh (-10…60 °C with LCD)
Display (option room version)
(HF32S: not illuminated)
Graphic LCD
Parameters freely configurable
Alarm functions (programmable) Sensor interruption or short circuit
Output signals Freely scalable by user
0...1 V, 0...5 V, 0...10 V, 0(4)...20 mA
Change in signal type HF33 only
Power supply HF32: 10...28 VDC: 10 V + (0.02 x load)
HF33: 15…40 VDC/12…28 VAC
HF34: 8…40 VDC /6…28 VAC
Power consumption HF32: max 40 mA, other models < 100 mA
Circuit type HF32: 2 x 2 wires, HF33: 3/4 wires
Min. / Max. load V-signal:≥1 kΩ/V / mA signal: ≤ 500 Ω
Firmware update Possible by HW4 software
Sensor diagnostics (Drift, state) Programmable. Default: off
Sensor protection Polyethylene filter
Max. wind speed 20 m/s at probe
Adjustments Via ROTRONIC accessories
Humidity: multi point; temperature: 2 points
Hygro- /Thermostat 2 Relays, HF34 only
Data logging Internal, 2000 data point memory
Dewpoint /frostpoint calculation Yes
PC interface With ROTRONIC interface cable,
HW4 compatible
Housing material / weight ABS / approx. 120g
Cable connections 1 x M16x1.5, on terminals
Norms CE- compliant, 2007/108/EG
Audit trail, Electronic Records FDA CFR21 Part 11 and GAMP compliant
IP protection rating & fire protection class IP65 / Corresponds to UL94-HB

The HF3 transmitter is designed for fixed installation in cost sensitive commercial HVAC applications where conditions are within the range of 0 to 100 %RH and -40 to 60°C (-40 to 140°F). The HF3 will satisfy application requirements ranging from the most basic to demanding.

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