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9.5
Input Value Correction
Input value can be corrected in [Sensor correction coefficient] and [Sensor correction] in Engineering
setting mode 1.
In [Sensor correction coefficient], set the slope of temperature change.
In [Sensor correction], set the difference between temperatures before correction and after
correction.
PV after input correction is expressed by the following formula.
PV after input correction = Current PV x Sensor correction coeff (Sensor correction value)
The following shows an example of input value correction using ‘Sensor correction coefficient’
and ‘Sensor correction value’.
Slope before correction
Slope after correction
(Fig. 9.5-1)
(1) Select any 2 points of PV to be corrected, and determine the PV after correction.
PV before correction: 300
PV after correction: 340
PV before correction: 750
PV after correction: 700
(2) Calculate Sensor correction coefficient from Step (1).
(
Y'
–
X'
) / (
Y
–
X
) = (700 – 340) / (750 - 300) = 0.8
(3) Enter a PV value of 300
using an mV generator or dial resistor.
(4) Set Step (2) value as a Sensor correction coefficient.
(5) Read the PV.
240
will be indicated.
(6) Calculate the sensor correction value.
Calculate the difference between ‘PV after correction’ and Step (5) PV.
340
– 240
= 100
(7) Set Step (6) value as a Sensor correction value.
(8) Enter an electromotive force or resistance value equivalent to 750
using an mV generator or dial resistor.
(9) Read the PV, and confirm that 700
is indicated.
300
300
340
750
750
700
After correction
Before correction
X'
X
Corrected from 300
to 340
Y
Y'
Corrected from 750
to 700
Содержание PCB1
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