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7Semi Industrial RS485 Temperature and Humidity Sensor Probe with Modbus RTU Output and DIP Switch Configuration
The 7Semi Industrial RS485 Temperature and Humidity Sensor Probe is an industrial-grade sensing device designed for precise, long-term monitoring in demanding environments. Built on the Modbus RTU protocol over RS485, it delivers highly accurate temperature readings from -40 deg C to +80 deg C and relative humidity readings from 0% to 100% RH, making it a reliable choice for HVAC systems, building automation, cleanrooms, cold-chain monitoring, and industrial process control. The probe is encased in a durable plastic housing with a breathable, dust-proof sintered metal filter that protects the sensing element while maintaining accurate atmospheric contact.
This version includes a 2-metre cable and supports a wide input voltage range of 9V to 36V DC, providing compatibility across a broad range of industrial power supplies. A built-in DIP switch allows on-site configuration of the Modbus device address and baud rate without any software tools, making deployment and re-addressing straightforward. The 4-wire RS485 interface (VCC, GND, RS485 A+, RS485 B-) is fully compatible with SCADA platforms, PLCs, HMIs, Arduino, and other MCU-based systems. Onboard signal processing ensures stable, conditioned output ready for direct integration.
Key Features
- RS485 Modbus RTU Output: Uses the industry-standard Modbus RTU protocol over RS485 for reliable, long-distance communication up to several hundred metres.
- DIP Switch Configuration: Onboard DIP switch for setting the Modbus device ID and baud rate directly on the hardware, no laptop or software required.
- Wide Supply Voltage: Accepts 9V to 36V DC input, suitable for industrial panel supplies, 12V systems, and 24V DC bus networks.
- Temperature Measurement Range: Covers -40 deg C to +80 deg C for use in sub-zero cold storage as well as high-temperature industrial enclosures.
- Humidity Measurement Range: Full 0% to 100% RH coverage for environments ranging from arid to fully saturated air.
- Configurable Baud Rates: Default baud rate of 9600 bps; user-selectable options of 19200, 38400, and 115200 bps via DIP switch.
- 4-Wire Connection: Simple wiring with VCC, GND, RS485 A+, and RS485 B- connections for fast, error-resistant installation.
- Plastic Probe with Sintered Filter: 150 mm probe in a 15.7 mm diameter plastic body with a dust-proof, breathable sintered metal cap protecting the sensor element.
- 2-Metre Cable: Pre-fitted 2-metre cable provides adequate reach for panel-mounted or wall-mounted installations without immediate extension requirements.
- Onboard Signal Processing: Integrated microcontroller handles data acquisition and Modbus formatting, delivering clean, conditioned output.
Applications
- HVAC Systems: Monitors temperature and humidity levels in heating, ventilation, and air-conditioning systems for automated climate control and energy efficiency.
- Building Management Systems: Integrates with BMS and BAS platforms via Modbus RTU for centralised environmental monitoring across multiple zones in commercial and industrial buildings.
- Server Rooms and Data Centres: Tracks ambient temperature and relative humidity to protect sensitive IT equipment and maintain uptime within recommended operating conditions.
- Cold-Chain and Refrigerated Storage: Suitable for pharmaceutical, food, and beverage cold-storage facilities where continuous, accurate monitoring is required for compliance and product safety.
- Greenhouse and Agricultural Monitoring: Measures climate conditions inside grow houses and controlled-environment agriculture setups to optimise plant growth and yield.
- Industrial Process Control: Deployed on production floors and manufacturing plants where temperature and humidity directly affect product quality and process repeatability.
- Cleanrooms and Laboratories: Maintains records of environmental parameters in ISO-classified cleanrooms, testing labs, and research facilities where tight climate tolerances are mandatory.
- Weather Stations and Climatology: Used in outdoor enclosures and weather monitoring installations for long-term atmospheric data logging over RS485 networks.
- Multi-Zone RS485 Bus Networks: The RS485 bus topology supports multiple sensor nodes on a single twisted-pair cable, making it cost-effective for large-scale, multi-point deployments in warehouses, factories, and campuses.
