Si-RS485TC-T-MB – Digital Solar Irradiance Sensor | IMT Technology Germany

The Si-RS485TC-T-MB is a digital silicon reference cell from IMT Technology GmbH, Germany, designed for accurate measurement of solar irradiance and sensor-cell temperature in photovoltaic (PV) monitoring systems. Using an RS485 interface with MODBUS communication, the sensor is well suited to industrial PV plants, solar farms and long-distance data acquisition systems.

Applications of Si-RS485TC-T-MB

The sensor provides a reliable reference for evaluating actual solar radiation received by a PV system. It can be used for PV performance monitoring, yield analysis, performance-ratio calculation, system diagnostics and comparison between measured irradiance and PV power output.

The Si-RS485TC-T-MB measures irradiance from 0–1500 W/m² and cell temperature from -40 to +90°C. Its RS485 digital communication makes it practical for integration with data loggers and monitoring systems.

Digital Si-RS485 Sensor Series

All measured parameters can be transferred via the digital RS485/MODBUS interface, while selected versions can be expanded with Tamb-Si, Tmodul-Si and Vwind-Si sensors.

German Technology for Accurate PV Monitoring

IMT Technology uses a high-quality monocrystalline silicon solar cell with active temperature compensation. The sensor is constructed similarly to a standard PV module, using EVA encapsulation, glass/Tedlar and a powder-coated aluminium housing. This helps provide comparable spectral response and incident-angle characteristics to PV modules, reducing mismatch effects in PV monitoring.

The sensors are calibrated against a reference cell calibrated by Germany's PTB National Metrology Institute. The calibration measurement uncertainty is specified at 1.2%, meeting Class A according to IEC 61724-1. The sensor also features IP67 protection, an operating temperature range of -35 to +80°C, and typical RS485 response time of approximately 1 second.

Comparison of IMT Reference Sensor Technologies

LTĐ – Authorized Distributor in Vietnam

LTĐ is an authorized distributor in Vietnam, supplying IMT Technology solar irradiance sensors and PV monitoring solutions.

We provide consulting, design, installation, configuration, calibration, warranty and fast repair services, supporting customers in selecting the appropriate sensor, communication interface and accessories for each photovoltaic monitoring application.