Filter
Top Products
Manual: 152-082010 301-305-306_303-307 Series Page 18 of 35
2.14. Temperature Coefficients
As the temperature of the instrument changes from the calibration temperature, errors will be
introduced into the output of the instrument. The Temperature Coefficient of Zero describes the change
in the output that is seen at zero flow. This error is added in to the overall output signal regardless of
flow, but can be eliminated by merely adjusting the zero potentiometer to read zero volts at zero flow
conditions. The Temperature Coefficient of Span describes the change in output after the zero error is
eliminated. This error cannot be eliminated, but can be compensated mathematically if necessary. The
curve pictured in Figure 2-10 shows the span error in percent of point as a function of temperature
assuming 23
0
C is the calibration temperature.
Span error -vs- Temperature
y = 5E-06x
2
- 9E-05x - 0.0007
-0.2%
0.0%
0.2%
0.4%
0.6%
0.8%
1.0%
1.2%
1.4%
0 10203040506070
Temperature (°C)
Span Error (% of Point)
Figure 2-10