Relative humidity and temperature sensor 3S-RH&AT-MBwall-mountModbus RTURS-485
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Characteristics
- Type
- relative
- Mounting
- wall-mount
- Output
- Modbus RTU, RS-485
- Supply voltage
- DC, 12VDC, 24VDC
- Protection level
- IP65
- Applications
- outdoor, for solar panels, for ambient air
- Measuring range (%)
Max.: 100 %
Min.: 0 %
- Precision
1 %
- Resolution
Max.: 0.1 %
Min.: 0.1 %
- Measuring range (temperature)
Max.: 85 °C
(185 °F)Min.: -40 °C
(-40 °F)- Accuracy (temperature)
Max.: 0.1 °C
(32.18 °F)Min.: 0.1 °C
(32.18 °F)- Resolution (temperature)
Max.: 0.1 °C
(32.18 °F)Min.: 0.1 °C
(32.18 °F)- Working temperature
Max.: 85 °C
(185 °F)Min.: -40 °C
(-40 °F)
Description
Overview
The SEVEN 3S-RH&AT-MB is a capacitive sensor for measuring relative humidity and ambient temperature. An alternative variant (3S-RH/AT/PS-MB) adds barometric pressure measurement. The unit includes mounting hardware and a multi-plate plastic radiation shield that permits free airflow while protecting the sensing elements from direct solar radiation.
Working principle & communications
The sensor uses a capacitive humidity element protected by a UV-resistant shield to ensure stable readings. Measurement data are transmitted via an RS485 serial interface using Modbus RTU (up to 38400 Baud) for direct integration with PLCs, data loggers and SCADA systems.
Applications
Installation
Verify operation at ground level before final mounting. Position the sensor away from heat sources, reflective surfaces and localized thermal disturbances. For rooftop installations, mount on the side facing predominant wind. Install in two steps: secure the support structure, then fasten the sensor to the mount.
Key benefits
Technical specifications
The SEVEN 3S-RH&AT-MB is a capacitive sensor for measuring relative humidity and ambient temperature. An alternative variant (3S-RH/AT/PS-MB) adds barometric pressure measurement. The unit includes mounting hardware and a multi-plate plastic radiation shield that permits free airflow while protecting the sensing elements from direct solar radiation.
Working principle & communications
The sensor uses a capacitive humidity element protected by a UV-resistant shield to ensure stable readings. Measurement data are transmitted via an RS485 serial interface using Modbus RTU (up to 38400 Baud) for direct integration with PLCs, data loggers and SCADA systems.
Applications
- Solar energy (PV) system monitoring
- Industrial environments and production plants
- Storage areas for moisture-sensitive products
- Transport vehicles and cold-chain monitoring
- Environmental monitoring networks
Installation
Verify operation at ground level before final mounting. Position the sensor away from heat sources, reflective surfaces and localized thermal disturbances. For rooftop installations, mount on the side facing predominant wind. Install in two steps: secure the support structure, then fasten the sensor to the mount.
Key benefits
- Accurate sensing: Capacitive RH element with 0.1% resolution and ±1% RH (20–70%) accuracy.
- Outdoor-ready: UV-resistant shield, ABS enclosure and IP65 protection for external use.
- Standard interface: RS485 + Modbus RTU up to 38400 Baud for easy system integration.
Technical specifications
- Model: 3S-RH&AT-MB (option: 3S-RH/AT/PS-MB)
- Measured data: Relative Humidity; Ambient Temperature (optionally Pressure)
- Sensor type: Capacitive
- RH range: 0% to 100% — Accuracy: ±1% RH (20–70%) at 25 °C — Resolution: 0.1%
- T range: -40 °C to +85 °C — Accuracy: ±0.1 °C (5–60 °C) — Resolution: 0.1 °C
- Pressure (option): 260 to 1260 hPa — Accuracy: 0.5 hPa — Resolution: 0.1 hPa
- Data output: RS485 up to 38400 Baud — Protocol: Modbus RTU
- Power supply: 12 to 30 V DC — Consumption: 20 mA max @ 24 VDC
- Electrical connection: LIYYC11Y PUR cable (units supplied with 3 m cable in some kits)
- Operating range: -40 °C to +85 °C — IP rating: IP65
- Box dimensions: 64 x 68 x 35 mm — Shield dimensions: Ø 105 x 100 mm — Weight: 0.5 kg
- Materials: ABS box and shield; stainless steel sensor tube with membrane filter
- Standards: Class A IEC 60751:2022 (Temperature); Class A IEC 61724-1:2021 (Relative Humidity)
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