HF3A Humidity and Temperature Transmitter
Benefits
- Versatile design to meet diverse application needs
- Precise relative humidity and temperature measurement with additional psychometric calculations
- Freely programmable outputs and scaling via [NFC]-Interface, including NFC powerless support
Applications
- HVAC systems for office buildings and storage rooms
- Museums and libraries where aesthetics matter
- Climate monitoring for greenhouses and swimming pools
- Light industrial manufacturing including electronics manufacturing, packaging, and small-scale assembly lines
New housing
- Robust, PC-ABS industrial-quality housing (IP65)
- Wall, Duct and Cable mount versions
- Display with trend indicator, LED status and backlighting¹
Outputs
- The 2 analog outputs are freely selectable and scalable
- 2-wire (HF3A-2), 3-/4-wire analog (HF3A-3) and 3-/4- wire digital (HF3A-D) available
- RS485 signal on screw terminal for HF3A-D
Power supply
- 2-wire: 10 VDC to 28 VDC
- 3-/4- wire: 18 VDC to 36 VDC
Technical Information
HF3A-2, HF3A-3 and HF3A-D
Wall version
Diagram shows a rectangular unit mounted on a wall, with a probe extending downwards. Dimensions provided: 122 x 172 x 40.5 mm.
Duct version
Diagram shows a unit designed for duct mounting, with a probe extending into the duct. Dimensions provided: 122 x 82 x 265.5 mm.
Cable version
Diagram shows a unit with a cable and a separate probe attached. Dimensions provided for housing: 122 x 82 x 40.5 mm; for probe: 144 x 15 mm.
| Feature | HF3A-2 (2-wire) | HF3A-3/ HF3A-D (3-/4-wire) |
|---|---|---|
| Probe | Humidity and Temperature fix mounted | Humidity and Temperature fix mounted |
| Accuracy at 23 °C | ±1.2 %rh, ± 0.1 °C | ±1.2 %rh, ± 0.1 °C |
| Initialization time | Typically 5 seconds. | Typically 5 seconds. |
| Measurement interval | 1 s | 1 s |
| Measurement range | 0 %rh to 100 %rh | 0 %rh to 100 %rh |
| Range of applications | Wall¹: -40 °C to 85 °C / -10 °C to 60 °C Duct²/Cable: -50 °C to 100 °C | Wall¹: -40 °C to 85 °C / -10 °C to 60 °C Duct²/Cable: -50 °C to 100 °C |
| Trend indicator | Yes | Yes |
| Display | Resolution up to 2 decimal places | Resolution up to 2 decimal places |
| Output signals analog | 4 mA to 20 mA | Freely scalable: 0 V to 1V, V to 5V, 0 V to 10 V, 0 mA to 20, 4 mA to 20 mA |
| Resolution analog output | >15 Bit | >15 Bit |
| Output signal digital | RS-485 signals on screw terminal | |
| Cable connections | 1 x M12 screw terminals | 1 x M12 screw terminals (2 x M12 for HF3A-D) |
| Psychometric calculations | All | All |
| Power supply | 10 VDC to 28 VDC | 18 VDC to 36 VDC |
| Circuit type | 2-wire | 3-/4-wire |
| Current Consumption | 2x23 mA | < 50 mA |
| Load per analog output | Max. 500 Ω | Max. 500 Ω |
| Humidity Sensor | ROTRONIC Hygromer® HT-1 | ROTRONIC Hygromer® HT-1 |
| Temperature Sensor | Pt100 1/3 Class B | Pt100 1/3 Class B |
| Interface | UART, NFC and USB | UART, NFC and USB |
| Software | HygroSoft | HygroSoft |
| Housing material | PC-ABS | PC-ABS |
| Dimensions | Wall: 122 x 172 x 40.5 mm Duct: 122 x 82 x 265.5 mm Cable: 122 x 82 x 40.5 mm (Housing only) 144 x 15 mm (Probe only) | Wall: 122 x 172 x 40.5 mm Duct: 122 x 82 x 265.5 mm Cable: 122 x 82 x 40.5 mm (Housing only) 144 x 15 mm (Probe only) |
| Weight | Wall: 204 g Duct: 226 g Cable: 332 g | Wall: 204 g Duct: 226 g Cable: 332 g |
| IP-Protection | IP65 | IP65 |
| Soldering material | Lead free (RoHS-Directive 2011/65/EU) | Lead free (RoHS-Directive 2011/65/EU) |
| Standards | CE Conformity 2014/30/EU | CE Conformity 2014/30/EU |
| Conformity | GAMP5 | GAMP5 |
¹ The measurement range for the wall-mount unit is limited due to the proximity of the probe to the transmitter electronics.
² The full measurement range of the duct mount unit can only be utilized if the transmitter electronics operate within the given application range.
Versions
Wall
Suitable for use in cleanrooms.
Duct
Suitable for use in HVAC systems.
Cable
Suitable for use in climatic chambers.
Accessories for Hygroflex Advanced Transmitters
NFC-USB-READER
The Hygroflex Advanced HF3A devices are equipped with an [NFC]-interface¹ through which the device can be configured. The [NFC]-interface can be accessed by means of a mobile phone or a computer equipped with an [NFC] reader. The NFC-USB-READER has an USB plug to connect the Reader with a Computer and requires no further configuration. The Hygroflex Advanced Transmitter is compatible with HygroSoft software only.
¹ Rotronic AG only supports the NFC-USB-READER, which can be purchased through Rotronic. Devices from third party suppliers cannot be considered.
Humidity and Temperature Window
Accuracy Bands
This graph illustrates the relative humidity accuracy bands [%rh] versus temperature [°C] for the HF3A Wall and HF3A Duct*/Cable versions. It shows varying accuracy levels (e.g., ±1.2%rh, ±1.7%rh, ±2.2%rh, ±2.7%rh, ±3.2%rh, ±3.7%rh) across different temperature ranges.
This graph shows the temperature accuracy bands [°C]/[K] versus temperature [°C] for the HF3A Wall and HF3A Duct*/Cable versions, indicating deviations from the setpoint.
* Both the electronics and the sensor operate under identical environmental conditions.
