ITC India has diversify in Thermopile pyranometer calibration as per ISO 9847 standards . So, lets connect with us to calibrate your pyranometer.
Before the calibration of pyranometer let us discuss about
Here is the table that makes the clear difference why thermipile is best of three.
|S.No||Specification||Thermipile Pyranometer||Photodiode Pyranometer||Photovoltic Pyranometer|
|1||Main Component||Thermocouple||Photodiode||PV cell|
|2||Sensitivity Range||300nm to 2800nm||400nm to 900 nm||350 nm to 1150 nm|
A thermopile pyranometer is a sensor based on thermopiles designed to measure the broadband of the solar radiation flux density from a 180° field of view angle.The first generation of thermopile pyranometers had the Hot junction of the sensor equally divided in black and white sectors. Irradiation was calculated from the differential measure between the temperature of the black sectors, exposed to the sun, and the temperature of the white sectors, sectors not exposed to the sun or better said in the shades.
In all thermopile technology, irradiation is proportional to the difference between the temperature of the sun exposed area and the temperature of the shadow area.
Thermopile Pyranometer is basically consist of two components.
Thermopile sensor: It has black coating and has a flat spectrum with
ability to absorb all the solar radiations. There are two junction one is active (hot) and one is passive (cold). the active junction is placed below the black coating and the passive junction is protected from solar junction and in thermal contact with the heat sink. The thermopile generates a small voltage in proportion to the temperature difference between the black coating surface and the instrument housing
Glass dome: It protects the thermopile sensor from convection. For first class and secondary standard pyranometers an another glass dome is used. It provides better thermal equilibrium between the sensor and inner dome, compared to using a single dome.
The thermoelectric detection principle is used, incoming radiation is almost completely absorbed by a horizontal blackened surface, over a very wide wavelength range. The resulting increase of temperature is measured via thermocouples connected in series or series-parallel to make a thermopile.
The thermopile is used to measure this temperature difference. The potential difference created in the thermopile owing to the temperature gradient between the two surfaces is used for measuring the amount of solar radiation. However, the voltage produced by the thermopile can be measured using a potentiometer. Radiation data needs to be integrated by means of an electronic integrator or planimetry.
They are widely used in …
Buliding engineering physics
Maximum senstivity range 285 nm to 2800 nm
Fast response time
Calibrated to ISO 9060 standards
Highest accurate than photodiode and photovoltic pyranometer.
To maintain performance, recalibration is usually recommended every two years, and a high-quality water-proof connector for the signal cable greatly simplifies the process.