Experience advanced digital measurement with the AcuDew Modbus RTU dewpoint transmitter.

The AcuDew Modbus RTU dewpoint transmitter combines SHAW’s proven ultra-high capacitance, aluminium oxide, dewpoint sensing technology with modern digital communication capability. Designed for precision, reliability and easy integration, it delivers accurate dependable data across demanding industrial environments with significant electrical noise.

Building on decades of sensor expertise, the SHAW AcuDew now features Modbus RTU Serial Line RS485 digital communication, allowing seamless integration with SCADA and PLC systems while maintaining excellent performance in electrically noisy environments. The result is a transmitter that provides accurate measurement, easy configuration and efficient data management for advanced process monitoring applications.

Key benefits and features

Reliable and accurate data transfer

The Modbus RTU Serial Line RS485 interface ensures stable and precise data transmission, even in areas with significant electrical interference. This robust communication method delivers greater reliability than analogue signals alone, guaranteeing confidence in every dewpoint reading.

Enhanced system integration

Each AcuDew Modbus RTU enables users to store a unique TAG ID for simple and fast device identification. This feature streamlines setup and commissioning, particularly on larger sites where multiple transmitters operate simultaneously.

Improved communication and diagnostics

Gain access to real?time status feedback, enabling clearer fault condition reporting and faster troubleshooting. The Modbus interface improves communication between devices, reducing downtime and supporting maintenance strategies.

Customisable measurement outputs

To meet your specific process requirements, every AcuDew is factory?configured to your chosen output units. Select from:

• °C or °F dewpoint
• ppm(V) or ppb(V) moisture content
• g/m³ or lb/MMSCF moisture density

Process data is transmitted directly to your SCADA or PLC system, helping you maintain control and visibility of your moisture levels at all times.

Expanded service information

Modbus communication allows users to retrieve valuable diagnostic and service data, including:

• Calibration date
• Sensor measurement range
• Software version

This data supports effective preventative maintenance, ensuring each transmitter continues to operate at peak performance with full traceability.

Multi?sensor networking

For large installations, multiple AcuDew transmitters can be daisy?chained via a single EIA485 Standard Bus. This configuration reduces wiring complexity and installation time, enabling cost?effective and scalable network growth.

Comprehensive Compatibility

The AcuDew Modbus RTU integrates effortlessly into new or existing Modbus networks, offering improved data centralisation, operational efficiency and simplified system management.

SHAW sensor technology

At the core of every AcuDew is SHAW’s ultra high?capacitance aluminium oxide sensing technology, engineered for long?term stability, rapid response and precision across a wide measurement range.

Built?in AutoCal functionality allows quick calibration checks without removing the sensor, keeping downtime to a minimum and ensuring reliable operation.

Technical specifications

• Measurement type: Dewpoint or moisture content in gases
• Analogue output: 2?wire, 24?V, 4–20?mA
• Digital output: 4?wire Modbus RTU Serial Line RS485
• Sensor technology: SHAW ultra?high?capacitance aluminium oxide
• Accuracy: ±2?°C (±3.6?°F) dewpoint
• Measurement range: −120?°C to +20?°C (−148?°F to +68?°F) dewpoint
• AutoCal function: Yes
• Factory?configured output units: °C, °F, ppm(V), ppb(V), g/m³ or lb/MMSCF
• TAG ID storage: For unique device identification
• Diagnostics: Fault condition reporting, open/short circuit detection
• Multi?sensor support: EIA485 daisy?chain connectivity
• Compliance: CE and UKCA approved
• Certification: Supplied with Certificate of Calibration traceable to National and International Humidity Standards

A complete solution, ready to install

Every AcuDew dewpoint transmitter is supplied fully assembled and ready for immediate operation, including:

• Certificate of Calibration
• Instruction manual
• Two?metres of connection cable

Designed for easy integration and dependable performance, the AcuDew Modbus RTU dewpoint transmitter provides the flexibility of digital communication with the proven accuracy of SHAW moisture measurement technology, making it the ideal solution for your advanced monitoring and measurement needs.