Industrial Dual-Block Calibrator
Calibration Procedure
21
Calibration Procedure
Follow these steps for the calibration procedure:
1. Choose the set-points to use in the calibration of the R0, ALPHA, DELTA, and BETA parameters.
These set-points are generally -15
°
C, 0
°
C, 60
°
C, and 110
°
C (5
°
F, 32
°
F, 140
°
F, and 230
°
F) but
other set-points can be used.
2. Set the calibrator to the low set-point. When the Product reaches the set-point and the display is
stable, wait about 15 minutes and then take a reading from the thermometer. Sample the set-point
resistance by holding down
SET
and pushing
DOWN
. Write these values down as T
1
and R
1
respectively.
3. Repeat step 2 for the other set-points and record them as T
1
, R
1
, T
2
, R
2
, T
3,
R
3,
T
4,
and R
4
respectively.
4. Use the recorded data to calculate new values for R0, ALPHA, DELTA, BETA parameters with the
equations given below
.
Compute DELTA
A =
[
T
4
−
T
3
]
B =
[
T
3
−
T
2
]
E
=
R
4
−
R
3
F
=
R
3
−
R
2
Where:
T
1
−
4
– Measured temperature using thermometer.
R
1
−
4
– Value of R from display of Product (push
SET
and
DOWN
simultaneously.)
where
T
1
and R
1
are the measured temperature and resistance at -15
°
C
T
2
and R
2
are the measured temperature and resistance at 0
°
C
T
3
and R
3
are the measured temperature and resistance at 60
°
C
T
4
and R
4
are the measured temperature and resistance at 110
°
C
C
T
T
T
T
=
−
−
−
4 4 3 3
100
1
1
100
100
100
D
T
T
T
T
=
−
−
−
3
3
2
2
100
1
100
100
1
100
delta
AF
BE
DE CF
