SMP22x Pyranometer

  • ISO 9060 spectrally flat Class A
  • Market leader in directional response
  • Market leader in temperature response
  • Long-term stability ( 5-year stability rating)
  • Internal desiccant and temperature monitoring
  • RS-485 Modbus® communication
  • 5 year warranty
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SMP22x Pyranometer

Accuracy Redefined. Reliability Guaranteed.

The SMP22X is our most advanced ISO 9060:2018 spectrally flat Class A smart pyranometer, engineered for uncompromising precision in solar PV monitoring and scientific research. Built on the trusted SMP22 platform, SMP22X introduces long-term stability, a 5-year maximum calibration interval, and internal desiccant monitoring for superior lifecycle performance. While both share features like Modbus RTU communication, internal desiccant with a 10-year lifespan, and SmartExplorer software support, the SMP22X improves performance with a better temperature stability (±0.3% vs ±0.5%), and directional response errors. These improvements make it more suitable for demanding applications like scientific research and SCADA systems.

Why Choose SMP22X?

Best-in-Class Accuracy: Spectral error as low as 0.05%, directional response optimized for all angles.
Smart Diagnostics: Internal temperature and desiccant monitoring for proactive maintenance.
Long-Term Reliability: >10-year desiccant life and MTBF exceeding 10 years.
Enhanced Performance: Faster response time (<0.7s), improved temperature stability (±0.3%), and reduced zero-offset errors.

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Specifications

Spectral range (50% points) 250 to 3500 nm
Response time (63%) <0.7 s
Response time (95%) < 2 s
Zero offset A <+-5 W/m²
Zero offset B <+-1 W/m²
Directional response (up to 80° with 1000 W/m² beam) < ±5 W/m²
Temperature response (-40 to +70°C) <0.3 %
Digital output -400 to 2000 W/m²

FAQ

  • Negative output during night-time measurements?

    • This error is related to Zero Offset Type A. Normally this zero offset is present when the inner dome has a different temperature from the cold junctions of the sensor (the instrument housing). Practically this is always the case when there is a clear sky. 

      Because of the low effective sky temperature (< 0 °C) the Earth’s surface emits roughly 100 W/m2 of long-wave infrared radiation upwards. 

      The outer glass dome of a pyranometer also has this emission and is cooling down several degrees below air temperature (the emissivity of glass for the particular wavelength region is nearly 1). The emitted heat is attracted from the body by conduction in the domes, by wind and from the domes through infrared radiation. The heat flow is opposite to the heat flow when absorbing solar radiation and causes the well-known zero depression at night. This negative zero offset is also present on a clear day but is hidden in the solar radiation signal. 

      Zero Offset Type A can be checked by placing a light and IR reflecting cap over the pyranometer. The response to solar radiation will decay with the response time of the instrument, but the dome temperature will go to equilibrium with a time constant of several minutes. So, after about half a minute the remaining signal is mainly Zero Offset Type A. Good ventilation of the domes and housing minimizes zero offsets and increases stability. Using the Kipp & Zonen CVF4 ventilation unit can reduce Zero Offset Type A by about 50 %. 

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  • Maximum and minimum irradiation quantities?

    • Due to reflection from certain types of clouds the global irradiance at sea level can rise above the extra-terrestrial direct irradiance (the Solar Constant) of 1367 W/m² at the top of the atmosphere (WMO 1982). Values up to 1500 W/m² have been reported. Because the clouds move, this irradiance value mostly appears as short events of a few minutes duration.

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  • Is the pyranometer calibration affected by the length of the signal cable?

    • With longer cable lengths the impedance increases, however it does not affect the radiometer sensitivity for the following reason. For the SMPX the impedance of the voltage measurement device is at least 1000 times more than the impedance of the pyranometer plus cable. Therefore the current that goes through the readout cable is negligible and won’t generate an offset. 

      The digital RS-485 output can operate over cable lengths up to 1000 m, depending on the baud-rate used. 

       

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  • What type of pyranometer can I use for my fixed PV panels farm?

    • For this application the CMP10 and SMP10 are advised as they have an internal drying cartridge that will last for at least 10 years.

      Please note that the pyranometer needs to be mounted in the same angle (POA) as the PV panel. 

       

      For users that prefer the desiccant visible Kipp & Zonen offers the CMP11 and SMP11 with visible and user changeable desiccant.

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Accessories

Accessory Description
CMF Mounting Fixtures CMF Mounting Fixtures
More information 		CMF1 and CMF4 mounting fixtures for all series pyranometers Add To Basket
Glare Screen Kit Glare Screen Kit
More information 		Sun protection screen for downward facing radiometers mounted on an albedo/net radiation mounting plate Add To Basket
CM121B/C Shadow Ring CM121B/C Shadow Ring
More information 		To be used with Kipp & Zonen pyranometers, smart pyranometers, pyrgeometers and UV radiometers to shield the instrument from direct radiation. Add To Basket
METEON Data Logger METEON Data Logger
More information 		METEON is a hand-held device for use with Kipp & Zonen passive radiometers to display real-time irradiation values and has an integrated data logging function to store up to 3500 samples. METEON will operate for up to 7 weeks on 2 x AA batteries. Add To Basket
Adjustable Tilt Radiometer Mounting Kit Adjustable Tilt Radiometer Mounting Kit
More information 		Mount a radiometer at a desired solar zenith angle between 0° and 90° to measure tilted global or diffuse radiation. Add To Basket
CVF4 Ventilation Unit CVF4 Ventilation Unit
More information 		Ventilating solar radiation instruments improves the reliability and accuracy of measurements and reduces maintenance. CVF4 is a high quality waterproof ventilation unit designed to be used with Kipp & Zonen pyranometers, pyrgeometers, and ultraviolet radiometers. Add To Basket
LOGBOX SE Data Logger LOGBOX SE Data Logger
More information 		LOGBOX SE is a weatherproof field data logger with 4G LTE cellular communication. Designed for use with all Kipp & Zonen solar radiation instruments, both analog and Modbus®, including RT1. It is also compatible with DustIQ and Lufft all-in-one weather stations. LOGBOX SE can operate from internal batteries, external DC power or a solar panel. Add To Basket
Smart Powered Hub and Smart Hub Smart Powered Hub and Smart Hub
More information 		The Smart Hub is a passive 6 to 1 weatherproof hub for 2-wire RS-485 connections. The Smart Powered Hub adds a heavy duty 2.2A power supply. Add To Basket
PMU485 Smart Setup Hub PMU485 Smart Setup Hub
More information 		The PMU485 is a power source and data connection between a Smart Kipp & Zonen device and a PC. Add To Basket
Fixed Feet For Tilted CMP/SMP6-22 Mounting Fixed Feet For Tilted CMP/SMP6-22 Mounting
More information 		Kit with two fixed feet for easy installation of POA pyranometers. Add To Basket
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