Rotronic HF3A Humidity and Temperature Transmitter
The Rotronic HF3A is a versatile humidity and temperature transmitter designed for a wide range of applications, offering precise measurements and flexible configuration options.
Key Features
- Flexible design suitable for diverse application environments.
- Precise measurement of relative humidity and temperature, with additional psychrometric calculations available.
- Free programmable outputs and scaling via NFC interface, including NFC-Powerless support for easy configuration.
Applications
- Climate and ventilation systems for office buildings and storage rooms.
- Museums and libraries where precise environmental monitoring and aesthetics are important.
- Climate monitoring for greenhouses and swimming pools.
- Light industry, including electronics manufacturing, packaging, and small production lines requiring controlled environments.
Design and Housing
The HF3A features a robust, industrial-grade housing constructed from PC-ABS, providing IP65 protection. It is available in versions for wall, duct, and cable mounting. The housing includes a clear display with trend indication, an LED status indicator, and a backlight for improved visibility.
Outputs and Connectivity
The transmitter offers two freely selectable and scalable analog outputs. It is available in different configurations: 2-wire (HF3A-2), 3-/4-wire analog (HF3A-3), and 3-/4-wire digital (HF3A-D). The HF3A-D model also supports RS485 signal transmission via screw terminals.
Power Supply
- 2-wire models: 10 VDC to 28 VDC
- 3-/4-wire models: 18 VDC to 36 VDC
Technical Specifications
| Feature | HF3A-2 (2-Wire) | HF3A-3 / HF3A-D (3-/4-Wire) |
|---|---|---|
| Probe | Humidity and Temperature, fixed mounted | Humidity and Temperature, fixed mounted |
| Accuracy @ 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 second | 1 second |
| Measurement Range | 0 %rh to 100 %rh Wall: -40 °C to 85 °C / -10 °C to 60 °C Duct/Cable: -50 °C to 100 °C | 0 %rh to 100 %rh (non-condensing) -10 °C to 60 °C (with display) -40 °C to 85 °C (without display) |
| Trend Display | Yes | Yes |
| Analog Output Resolution | Up to 2 decimal places | Free scalable: 0-1V, 1-5V, 0-10V, 0-20mA, 4-20mA |
| Digital Output Signal | N/A | >15 Bit |
| Cable Connections | 1 x M12 screw terminals | RS485 signals on screw terminals (2 x M12 for HF3A-D) |
| Psychrometric Calculations | All | All |
| Power Supply | 10 VDC to 28 VDC | 18 VDC to 36 VDC |
| Circuit Type | 2-Wire | 3-/4-Wire |
| Current Consumption | 2 x 23 mA | < 50 mA |
| Load Capacity 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) Probe: 144 x 15 mm | 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) Probe: 144 x 15 mm |
| 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) |
| Norms | CE Conformity 2014/30/EU | CE Conformity 2014/30/EU |
| Conformity | GAMP5 | GAMP5 |
Note 1: The measurement range for the wall-mounted device is limited due to the proximity of the probe to the measurement transducer electronics.
Note 2: The full measurement range of the duct device can only be utilized if the measurement transducer electronics are operated within the specified application range.
Versions and Applications
The HF3A series is available in three primary versions:
- Wall Mount: Suitable for cleanroom applications.
- Duct Mount: Ideal for climate and ventilation systems.
- Cable Version: Designed for use in climatic chambers.
Accessories
NFC-USB-READER: This accessory enables configuration of the Hygroflex Advanced HF3A devices via [NFC] interface. It connects to a computer via USB and is compatible with the HygroSoft software. (Note: Rotronic AG only supports the NFC-USB-READER purchased directly from Rotronic.)
Measurement Windows
Humidity and Temperature Error Bands
Graph 1: Relative Humidity vs. Temperature
This graph illustrates the error bands for relative humidity as a function of temperature for the HF3A series. It shows:
- HF3A Duct/Cable: Error bands of ±3.7%rh, ±2.7%rh, and ±1.7%rh are indicated across the temperature range.
- HF3A Wall: Error bands of ±1.2%rh, ±1.7%rh, ±2.2%rh, and ±3.2%rh are shown.
- The x-axis represents temperature from -100 °C to 200 °C, and the y-axis represents relative humidity from 0%rh to 100%rh.
- Note: For both versions, the electronics and sensor operate under identical environmental conditions.
Temperature Error Bands
Graph 2: Temperature vs. Temperature Error
This graph displays the temperature error bands as a function of temperature for the HF3A series:
- HF3A Duct/Cable and HF3A Wall: Both versions show similar temperature error bands, ranging from ±0.1°C to ±0.5°C across the temperature spectrum.
- The x-axis represents temperature from -100 °C to 200 °C, and the y-axis represents temperature error in °C (or K) from -0.5 °C to +0.5 °C.
Rotronic: Improving the world, one measurement at a time.
