ISO 9060

A "secondary standard" pyranometer according to ISO 9060, type SR30.

The ISO 9060 solar energy standard - Regulations and classification of solar radiation measuring devices for hemispherical and direct solar radiation describes devices for measuring hemispherical solar radiation ( pyranometer ) and direct solar radiation ( pyrheliometer ), as used in the field of photovoltaics , among other things .

The first version of the standard dates from 1990; the ratification of a new version is planned for September 2018.

Accuracy classes for pyranometers

The standard divides pyranometers into three accuracy classes: “Secondary standard”, “First class” and “Second class” (second class), with “Secondary standard” corresponding to the highest class. This means that a measuring device in the secondary standard class has adopted its accuracy from a primary standard and can pass it on. The specifications required for each class are shown in the table below.

Pyranometer classes according to ISO 9060: 1990

specification	"Secondary standard" class	"First class" class	"Second class" class
Reaction time (for 95% of the reaction)	<15 s	<30 s	<60 s
Offsets ( zero-offset ) Shift A: response signal to a net thermal radiation of 200 W / m 2 Shift B: response signal to a change in the ambient temperature of 5 K / h	+ 7 W / m 2 ± 2 W / m 2	+ 7 W / m 2 ± 2 W / m 2	+ 7 W / m 2 ± 2 W / m 2
Non-stability (change in sensitivity per year)	± 0.8%	± 1.5%	± 3.0%
Non-linearity	± 0.5%	± 1.0%	± 3.0%
Direction deviation	± 10 W / m 2	± 20 W / m 2	± 20 W / m 2
Spectral selectivity	± 3%	± 5%	± 10%
Temperature deviation	± 2%	± 4%	± 8%
Slope deviation	± 0.5%	± 2.0%	± 5.0%

Individual evidence

1. ↑ ISO 9060 - 1990-11 - Beuth.de. Retrieved July 5, 2018 . 
2. ↑ "ISO 9060: 2018 background information brochure - how to prepare for the upcoming revision. Accessed July 5, 2018 (English). 
3. ↑ "ISO-9060 Standard & Pyranometer Measurement Accuracy. Retrieved July 18, 2018 (English).