Digital pyranometer RC22M

RS-485Modbus RTU

Overview
The RC22M Reference Cell and Accessories system is a compact, modular solution for measuring irradiance, temperature and wind on commercial and industrial PV arrays. Main assembly part number 810323-01. Designed to pair with Mars™ sensors to provide accurate performance monitoring and to minimise soiling-related measurement bias.

Key features

• Measures irradiance, wind and temperature: Irradiance range 0 to 1500 W/m², wind speed, back-of-module (BOM) temperature and ambient temperature.
• High accuracy across wide range: Auto-ranging design with calibrations at 1000 W/m² (STC) and 135 W/m² (BSTC) for reliable readings at both high and low irradiance.
• Glass-to-edge design: Hydrophobic glass-to-edge housing promotes water roll-off and reduces soiling to improve long-term measurement consistency.
• Modbus RTU communication: Digital RS485 (Modbus RTU) interface with user-settable address for straightforward integration into SCADA and data-logging systems.
• Modular and expandable: Supports optional wind speed sensors and RTDs for ambient and back-of-module temperature measurements.
• Easy installation and configuration: Compact, easy-to-mount package; optional cables and connectors available in multiple lengths. Configuration and calibration managed via dedicated software.

Technical specifications

• Product Number: 880105_A
• Measurement Range: 0 to 1500 W/m²
• Operating Temperature Range: -40 to 80 °C
• Input Voltage: 10–30 VDC
• Current Consumption: Without wind sensor: typ. 6 mA; with wind sensor: < 60 mA
• Communication Protocol: Modbus over RS485 (RTU), user-settable address
• Ingress Protection Rating: IP67
• Measurement Uncertainty: ±2.0% @ 1000 W/m²
• Irradiance Calibration: ±1.2% @ 1000 W/m²
• Dimensions: 65 x 65 x 48.0 mm (2.56 x 2.56 x 1.89 in)