EKO INSTRUMENTS CO., LTD. - Pyranometer MS-60/60S - Instruction Manual Ver. 4
Pg. 43
When MS-60 is calibrated at an external calibration laboratory, in practice slight differences can be expected
relative to the MS-60 manufacturer calibration scale and lab-scale. A difference in the calibration
measurement results can be explained by the differences with respect to the method of calibration, reference
sensors, sensor characteristics and measurement conditions.
In case the sensor needs to be adapted to the new calibration scale, there are two ways to adopt the sensor
sensitivity.
1. MS-60
The scale difference can be applied as a relative factor. A conversion multiplication factor can be applied
to calculate the irradiance. In this case, the original manufacturer calibration remains unchanged. The
multiplication factor can be applied in the data logger or processing software.
2. MS-60S
The scale difference can be applied to the sensitivity figure default to the sensor. This can be done
through the EKO
“SensConf” Software. Since the internal sensor sensitivity figure is specified in µV/W/m
2
,
the sensitivity figure can be changed relative to the irradiance scale change.
Example:
The sensor recalibration revealed a difference with respect to the irradiance measured by the MS-60
relative to the lab-scale. The MS-60 irradiance readings are underestimated and can be adapted by
lowering the MS-60 sensitivity factor, which can be calculated with following:
S
new
= I
MS80
/ I
ref
x
S
origin
Where:
S
new
:
New Sensitivity of MS-60 [
μV/W/m
2
]
S
origin
:
Original sensitivity of MS-60 [
μV/W/m
2
]
I
MS-60
:
Irradiance measured by MS-60 [W/m
2
]
I
ref
:
Reference Irradiance [W/m
2
]
A - 6 . R e c a l i b r a t i o n