Our CMP series pyranometers are well known around the world for their high quality, durability and accuracy. The instruments do not require any power and are ideal for remote sites with limited power availability or for field studies. Each has an individual calibration factor/sensitivity to convert the mV output signal to W/m2 of irradiance.
The signal output is a very low voltage, typically around 10 millivolts on a bright sunny day. To measure 1 W/m2 of irradiance requires a data logger ‘accuracy’ of better than 10 microvolts. This normally means a specialized meteorological data logger. Industrial type analogue inputs do not usually have sufficient sensitivity and the SMP series should be used.
CMP3 and CMP10 have internal desiccant that lasts for at least 10 years to reduce maintenance costs. Other CMP models have self-indicating desiccant in an easily accessed drying cartridge that should be inspected monthly and the desiccant changed when necessary.
Smart SMP Series:
Our SMP range of pyranometers is based on the proven technology of the CMP series, but has a micro-processor, memory and firmware that makes them Smarter and faster.
Modbus® RTU interfaces directly to, PLC’s, SCADA systems, industrial networks and controllers. Smart in-struments are addressable, and up to 247 units can be connected to a single network. Measurement data is updated every second and the user can access irradiance, type and serial number, instrument settings, full calibration history, status information, & more. The digital signal avoids all the issues of analogue-to-digital conversion performance that arise with many industrial data loggers and input modules, preserving the accuracy of the pyranometer’s 24-bit differential input ADC.
SMP Series pyranometers can operate from 5 to 30 VDC and the power input has both reverse polarity and over-voltage protection. They have a feed-forward algorithm that makes them faster than our passive CMP series and an integrated temperature sensor and polynomial functions for better temperature correction.