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When you select RATIO for AIN10 the, logger will make the following calculation:
Logged value OUTx = R
= 100 * U
Pt-100
A usable polynomial is calculated for °C and Fahrenheit in the Excel file that came with the downloaded software package.
T
= -3.89779E-06x
+ 2.20939E-03x
3
Celcius
T
= -3.89779E-06x
3
+ 2.20939E-03x
Kelvin
T
= -7.01601E-06x
+ 3.97691E-03x
3
Fahrenheit
You can apply the above polynomials to OUTx to convert resistance to temperature in degrees Celcius, Kelvin or
Fahrenheit.
9.6.4
Polynomials for UVS
Polynomial in mV:
To have the output values recorded in mV (millivolt) we will have to enter the following polynomial A1=1
If you are only interested in the UV values recorded by the instrument you would probably like to have these readings in
W/m².
Polynomial for W/m²:
To have the output values recorded in W/m² we will need to make some calculations using the mean sensitivity values of
the UVS instruments. The mean sensitivity values can be found on the supplied calibration certificates.
Example:
The calibration certificates state that the mean sensitivity of the UVS-A = 30.083 W/m²/V and the mean sensitivity of the
UVS-B =1.879 W/m²/V.
In order to have the correct engineering units, W/m², we need to apply the following equation: A1=Mean sensitivity/1000
For this example UVS-A
For this example UVS-B
A0 = A2 = A3 = 0
/ U
= 100*Uin10/Uin9
Pt-100
RESISTOR
+ 2.23389E+00x -241.600
2
2
+ 2.23389E+00x + 31.55
+ 4.02100E+00x – 4.02880E+02
2
A1 =30.083/1000=0.030083
A1 =1.879/1000=0.001879
Please note that this cannot be used in combination with the Kipp & Zonen
Uviator software.
Uviator requires all logged outputs to be in Volt!
Polynomial for converting mV to Celsius:
In your UVS manual you will find a table to convert the voltage output of the UVS
into the temperature (°C). Using the described way to create polynomials this
leads to:
°C = 1.97893E-09x
These values can be entered in the polynomials section:
– 1.25261E-05x
+ 4.60569E-02x – 4.28345E+01
3
2
25
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