Fronius TransPocket 150 - Page 72

72
A temperature-dependent resistance as per the table below must be measured between
pins 1 and 2 of the X2 connector.
Maximum tolerance +/- 4.7%
An example for the approximation of the target resistance for temperatures not specified
in the table is shown below.
Example: Ambient temperature = T
amb
= 23°C
R
diff
= (R
low
- R
high
) / 5 = (12,490 ohm - 10,000 ohm) / 5 = 498 ohm
R
target
= R
high
+ R
diff
*(T
high
- T
amb
) = 10,000 ohm + 498 ohm * (25-23) = 10,996 ohm
The individual symbols stand for the following variables:
-T
amb
= ambient temperature of the temperature sensor in °C
-R
low
= resistance in ohm according to the table for the next temperature down from
the ambient temperature
-R
high
= resistance in ohm according to the table for the next temperature up from the
ambient temperature
-T
high
= temperature in °C for resistance R
high
-R
diff
= difference per °C in ohm between R
low
and R
high
-R
target
= target resistance for the specified ambient temperature in °C
Temp. [°C] R Nom [] Temp. [°C] R Nom [] Temp. [°C] R Nom []
0 32,650 35 6531 70 1752
5 25,388 40 5327 75 1481
10 19,900 45 4369 80 1258
15 15,708 50 3603 85 1072
20 12,490 55 2986 90 917.7
25 10,000 60 2488 95 788.5
30 8057 65 2083 100 680