Relative Humidity & Ambient Temperature Sensor With Modbus Output – 3S-RH&AT-MB
The SEVEN Relative Humidity & Ambient Temperature Sensor is specifically designed to measure relative humidity and ambient temperature, with an optional pressure measurement feature.
The sensor is supplied with mounting facility, and protected from direct sunlight & radiations by a plastic radiation shield with four aspirated plates that allow the air to pass freely.
3S-RH&AT are sensors that measure the humidity and temperature of the air. If you want to measure air pressure in addition to humidity and temperature, we also have the 3S-RH/AT/PS model available as an option.
Relative Humidity Sensors are used for estimating of spectral variations that can impact the solar plant’s performance. According to IEC61724-1:2021, measurements of relative humidity can be used to determine changes in incidence spectrum that could impact the power output of PV modules and the readings from irradiance sensors. Furthermore, the temperature and pressure of the surrounding air affect how much moisture it can contain. As a result, the main determinant of relative humidity is ambient temperature. The impacts of relative humidity on solar power plants include increased heat transfer from the cell surface and refraction of incoming sunlight. Last but not least, the times of wetness due to condensation can also be calculated by combining humidity data and ambient temperature data. All of these reasons show the impact of relative humidity and ambient temperature sensors on the performance of photovoltaic systems.
What is the working principle of Relative Humidity and Ambient Temperature sensor?
For more precise assessment of ambient humidity, the Relative Humidity Sensor is equipped with a UV-resistant protective shield. This shield protects the transmitter inside. The measured values are transmitted to monitoring devices, data loggers, and other receiver units via the serial RS485 interface with MODBUS RTU protocol.
Technical Specifications
| Item Code | 3S-RH&AT-MB | 3S-RH/AT/PS-MB |
| Measured Data | Relative Humidity Ambient Temperature |
Relative Humidity Ambient Temperature Pressure |
| Sensor Type | Capacitive | |
| RH Range | 0% to 100% | |
| RH Accuracy | ±1% RH (20 … 70%) at 25 °C | |
| RH Resolution | 0.1% | |
| T Range | -40°C to +85°C | |
| T Accuracy | ±0.1% °C at (5 … 60 °C) | |
| T Resolution | 0.1°C | |
| Pressure Range | – | 260 to 1260 hPa |
| Pressure Accuracy | – | 0.5 hPa |
| Pressure Resolution | – | 0.1 hPa |
| Data Output | RS485 up to 38400 Baud | |
| Communication Protocol | Modbus RTU | |
| Power Supply | 12 to 30 V DC | |
| Power Consumption | 20 mA max @ 24 VDC | |
| Electrical Connection | 3 m LIYYC11Y PUR Cable, UV and Weather Resistant | |
| Operating Temperature Range | -40°C to +85°C | |
| Box Dimensions | 64 x 68 x 35 mm (W x L x H) | |
| Shield Dimensions | Ø 105 x 100 mm | |
| Weight | 0,5 kg | |
| IP Rating | IP 65 | |
| Box Material | ABS | |
| Sensor Housing Material | Stainless Steel Tube – Membran Filter | |
| Shield Material | ABS | |
| Standard | Class A according to IEC 60751:2022 (Temperature)
Class A according to IEC 61724-1:2021 (Relative Humidity) |
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Where is 3S-RH&AT-MB and 3S-RH/AT/PS-MB used?
- Solar energy systems,
- Industrial areas,
- Production facilities,
- Storage areas,
- Assessing conditions in transportation vehicles,
- Controlling humidity to protect moisture-sensitive products and equipment.
How to install Relative Humidity & Ambient Temperature Sensor with Modbus Output?
Before installation, it is advised that the system be run at ground level to ensure that every part is functioning as it should.
The sensor should be positioned away from any dark, reflective, or heat-absorbing objects in order to choose the best spot. It is preferable to mount the product on the building’s side that faces the direction of the predominant wind when it is to be installed on a rooftop. Additionally, the sensor should not be placed next to any heat sources, such as vents or chimneys.
Installing a sensor can be done in two phases. First, the mounting structure for the ambient temperature and relative humidity sensors needs to be put in place. After that, the sensors need to be fastened to the mounting framework.
Why Choose Seven Relative Humidity and Ambient Temperature Sensor?
- High Accuracy: Provides accurate wind direction data with little variation, guaranteeing the data’s dependability.
- Weather Resistance: Perfect for outdoor use, the plastic structure guarantees resistance to corrosion, UV deterioration, and other environmental influences.
- Shield: The device comes with a UV-resistant shield that protects the relative humidity and temperature sensors.
Frequently Asked Questions (FAQ)
1- What is the Class?
All 3S-RH&AT-MB and 3S-RH/AT/PS-MB sensors are Class A according to IEC 60751:2022 (Temperature) and Class A according to IEC 61724-1:2021 (Relative Humidity)
2- What is the warranty period of 3S-RH&AT-MB and 3S-RH/AT/PS-MB?
All 3S-RH&AT-MB and 3S-RH/AT/PS-MB sensors come with a 2-year warranty.
3- What is the price of relative humidity and ambient temperature sensor?
3S-RH&AT-MB and 3S-RH/AT/PS-MB prices varies between 400 and 600 EUR.
4- What are the delivery times?
- Small Orders (up to 20 pcs): approx. 2-3 weeks
- Bulk orders (20 pcs – 100 pcs): approx. 6-8 weeks
5- How do I set up the sensor?
Follow our user manual which include step-by-step instructions. The user manual link is https://www.sevensensor.com/files/d/en/3S_RH_AT_PS_User_Manual.pdf
6- Does the sensor include a cable?
Each unit comes with a 3 m LIYYC11Y PUR Cable (UV and weather resistant). Other lengths are available on request.