The new Hygroflex 3 Series is the latest development in HVAC transmitters for relative humidity, temperature and dew point. The HF3 series offers you maximum reproducibility and a guaranteed system accuracy of <2% RH and 0.3 K. The transmitter has 2 or 2×2 wire 4 – 20mA loop outputs or 3 wire 4-20mA/0-10V outputs (User scaleable with software). The transmitters come in various configurations and the optional HW4 Software allows many useful functions to be activated.
The HygroFlex 3 series is ideal for cost sensitive applications where the exact measurement of humidity and temperature is still required. The transmitters can be used in a variety of fields for heating, ventilation and air conditioning applications, greenhouses, museums, warehouses, libraries, railways stations and for climate control in office buildings.
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Device Type |
HF32 2-wire; HF33 3/4-wires |
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Integrated sensors |
Yes |
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Humidity sensor |
ROTRONIC Hygromer® IN-1 |
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Temperature sensor |
Pt100 1/3 Class B |
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Accuracy at 23 ±5 °C |
±2.0 %rh / 0.3 K (±1.0 %rh / 0.2 K Type R) |
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Resolution AirChip3000 |
<0.02 %rh / 0.01 K |
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Long-term stability humidity sensor |
<1 %rh / year |
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Response time τ  63 |
<10 s |
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Measurement range |
-40…60°C / 0-100 %rh |
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Electronics operating range |
-40…60°C / 0-100 %rh (-10…60°C with LCD) |
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Display (Space version only) |
Graphic LCD (HF32S: no backlight) Parameters freely configurable. |
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Alarm functions (programmable) |
Open or shorted sensor |
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Output signals |
Freely scalable by user 0-1V, 0-5V, 0-10V, 0-20 mA & 4-20 mA |
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Change in signal type |
HF33 only |
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Power supply |
HF32: 10…28 VDC: 10 V + (0.02 x load) HF33: 15…40 VDC/12…28 VAC |
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Power consumption |
HF32: max 40 mA, other models < 100 mA |
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Circuit type |
HF32: 2 x 2 wires, HF33: 3/4 wires |
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Min. / Max. load |
V-signal:≥1 kΩ/V / mA signal: ≤ 500 Ω |
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Firmware update |
Via service connector, requires HW4 software |
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Sensor diagnostics (Drift, state) |
Programmable.Default:Â Â Â Â Â Â Â Â Â Â Â off |
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Sensor protection |
Polyethylene filter |
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Max. air velocity |
20m/s at probe |
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Adjustments |
Via ROTRONIC accessories Humidity: multi point; temperature: 2 points |
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Hygro- /Thermostat |
2 Relays, HF34 only |
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Data logging |
Internal, 2000 data point memory |
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Dewpoint /frostpoint calculation |
Yes |
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PC interface (service connector) |
With ROTRONIC interface cable, HW4 compatible          |
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Housing material / weight |
ABS / approx. 120g |
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Cable connections |
1 x M16x1.5, on terminals |
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Standards |
CE- compliant, 2007/108/EG |
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Audit trail, Electronic Records |
FDA CFR21 Part 11 and GAMP compliant |
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