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7037/7038/7040/7041
User's Guide
Computing R
Before computing the new values for R
known. The values may be found by either accessing the probe calibration menu
from the controller panel or by inquiring through the digital interface. The user
should keep a record of these values in case they may need to be restored in the
future. The new values R
for R
temperature errors err
If for example R
respectively and the data for t
new values R
respectively. Program the new values R
the calibration by setting the temperature to t
again. If desired the calibration procedure may be repeated again to further
improve the accuracy.
Calibration Example
The bath is to be used between 25 and 75 °C and it is desired to calibrate the
bath as accurately as possible for operation within this range. The current values
for R
points are chosen to be 30.00 and 80.00 °C. The measured bath temperatures
are 29.843 and 79.914 °C respectively. Refer to Figure 10 for applying equations
to the example data and computing the new probe constants.
52
and ALPHA
0
0
and ALPHA, the calibration temperature set-points t
0
and err
L
and ALPHA were previously set for 100.000 and 0.0038500
0
and ALPHA would be computed as 99.885 and 0.0038302
0
and ALPHA are 100.000 and 0.0038500 respectively. The calibration
0
and ALPHA the current values must be
0
and ALPHA are computed by entering the old values
into the following equations:
H
, t
, err
, and err
L
H
L
H
and ALPHA into the controller. Check
0
and t
L
and t
, and the
L
H
were as given above then the
and measuring the errors
H
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