Kipp & ZonenPrecision Control (Thailand) Ltd
Regular calibration of all measurement equipment is the key to maintaining the original performance and accuracy of Kipp and Zonen products. We recommend calibration of the sensitivity of our radiometers once every year and this is mandatory in Thailand industry standards.
The individual sensitivity of a Kipp & Zonen radiometer is determined under the measurement conditions stated on its calibration certificate and is valid at the date of first use.
Many factors affect the measurement uncertainty of a radiometer under varying measurement conditions that differ from the calibration conditions, but the non-reversible effect on sensitivity is mainly caused by exposure to solar radiation. The physical properties of any optical radiometer change due to ultraviolet (UV) radiation affecting diffusers, optical filters, photodiodes, and the black absorber coating of thermopile detectors.
Kipp & Zonen specifies this ageing affect as ‘non-stability (change/year)’ and, in general, it will take about 1 years to noticeably affect the accuracy of measurements. It is for this reason that Kipp & Zonen recommends you calibrate your radiometers at least once every one year.
Industrial customers using our products in testing, quality or process control (including solar energy) may have internal QA/QC procedures that require annual calibration. Certain industry standards, such as IEC 61274-1, March 2017 Photovoltaic system performance – Part 1: Monitoring, also specify a yearly calibration interval.
Kipp & Zonen operates a network of centrally managed calibration facilities around the world and Precision Control Thailand has been appointed to be the authorized calibration center controlled by Kipp & Zonen head office, according to ISO 9847:1992 type IIc to provide certified calibration service for South East Asia by professionally trained staff. This will ensure a much efficient and economic solution with short turnaround times.
For information and quotations regarding calibration contact Precision Control Thailand, or submit the calibration form below.
Repair and Replacement
On top of Calibration Services, Precision Control Thailand also provide Repair and Replacement of pyranometer parts in Thailand office which includes:
The snap-on white sun shield helps to stabilise the measurements in partially cloudy conditions
It is necessary to protect the black detector coating against external influences which may affect the measurement; such as precipitation, dirt and wind. Most pyranometers use an optical quality glass for their hemispherical single or double domes.
A bubble level and two adjustable feet ensure accurate horizontal levelling of the detector.
It is recommended to check the desiccant in the drying cartridge at least monthly. This is a self-indicating silica-gel. As it absorbs water vapour the colour changes from orange to clear (transparent). At this point it is not fully exhausted but you cannot see any further change. It is advisable to change the desiccant when there are still a few of the ‘balls’ partially orange.
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