ThermoWorks 9103 HART SCIENTIFIC FIELD DRY-WELL TEMPERATURE CALIBRATORS - Manual (Page 43)

10.2.3 Compute BETA
x
T
= ⎡
⎣⎢
⎤
⎦⎥
− 1
100
1
y
T
= ⎡
⎣⎢
⎤
⎦⎥
1
100
( )( ) ( ) ( ) ( ) ( )( ) ( ) beta
alpha x y
T
x y
delta
y
R
rzero
alpha x y
= + − −
1
3
1
3 2
1
3
Where T
1
and R
1
are the measured temperature and resistance at –25.00°C and
alpha, rzero, and delta are the new values of ALPHA, R0, and DELTA calcu-
lated above.
Program the new values for DELTA (delta), R0 (rzero), ALPHA (alpha), BETA
(beta) into the instrument with the following steps.
1. Reference Section 7.13 to display R
0
.
2. Press “SET” then use the “UP” or “DOWN” keys until the correct nu-
merical setting is displayed. Press “SET” to accept the new value.
3. Repeat step 2 for ALPHA and DELTA.
10.2.4 Accuracy and Repeatability
Check the accuracy of the instrument at various points over the calibrated
range. If the instrument does not pass specification at all set-points, repeat the
Calibration Procedure.
41
10 Calibration Procedure
Calibration Procedure