Si-RS485TC IMT Technology GmbH Việt Nam, Solar Irradiance Sensor (PV Reference Cell) | Advanced replacement for RT1

Si-RS485TC – IMT Solar Irradiance Sensor (PV Reference Cell) | Advanced replacement for RT1

In modern photovoltaic (PV) systems, accurate solar irradiance measurement is essential for performance monitoring, efficiency optimization, and predictive maintenance. The Si-RS485TC series from IMT Technology represents a next-generation PV reference cell, designed as a high-performance replacement for legacy sensors such as RT1. With digital communication, superior accuracy, and robust industrial design, this sensor is widely used in utility-scale solar farms, rooftop PV systems, and meteorological stations.

Technology overview and application

The Si-RS485TC sensor is based on monocrystalline silicon reference cell technology, designed to mimic the behavior of actual PV modules. This ensures highly accurate irradiance measurement under real operating conditions. Its spectral response (SR) and incident angle modifier (IAM) closely match PV panels, minimizing mismatch errors and improving monitoring reliability.

Additionally, the sensor integrates active temperature compensation (TC), ensuring stable and precise readings even under fluctuating environmental conditions. The built-in RS485 Modbus RTU communication allows seamless integration with SCADA systems, data loggers, and inverters, making it ideal for Industry 4.0 and smart energy applications.

Key technical specifications & highlights

The Si-RS485TC series stands out with its high-end technical performance:

• Measurement range: up to 1500 W/m² irradiance
• Accuracy: Class A (IEC 61724-1), calibration uncertainty ~1.2%
• Temperature compensation: Active (TC) for high precision
• Output signal: RS485 Modbus RTU (digital communication)
• Operating temperature: -35°C to +80°C
• Protection class: IP67, suitable for harsh outdoor environments
• Integrated sensors: Cell temperature (Pt1000 Class AA), optional ambient/module temperature

Compared to traditional sensors like RT1, the Si-RS485TC offers higher accuracy, digital connectivity, and reduced maintenance, making it a superior upgrade solution.

Model series and strengths

Why choose Si-RS485TC over RT1?

• Better spectral matching with PV modules
• Digital Modbus communication (RS485) for automation systems
• Lower mismatch error and higher linearity than conventional sensors
• Modular expansion with temperature and wind sensors
• Proven durability for long-term outdoor operation

LTĐ – Authorized distributor in Vietnam

LTĐ is proud to be an authorized distributor in Vietnam, delivering genuine IMT sensors and complete engineering solutions:

• System design consulting
• Installation & commissioning
• Configuration & calibration (calib)
• Warranty & fast repair services

With strong expertise in automation and renewable energy, LTĐ ensures optimal performance and long-term reliability for your solar monitoring system.