45
Shifting Input Values Section 4-1
4. Although the input shift was performed at two points, close to room tem-
perature (ambient temperature) and near to the SP, select points close to
each end of the sensor range to improve accuracy across the full range of
sensor measurement.
Example of Two-point
Temperature Input Shift
In this example, we use the ES1A K 160 to 260°C specification, where the
input temperature setting range is 0 to 260
°C.
In equations 1 and 2, the set temperature lower limit YL is 0
°C and the set
temperature upper limit YH is 260
°C. Check the temperature of the control tar-
get.
We will assume that when the room temperature X1 is 25
°C, the readout on
the Controller Y1 is 40
°C, and when the temperature near the SP X2 is 110°C,
the readout on the Controller Y2 is 105
°C.
Lower Limit Temperature Input Shift Value
Upper Limit Temperature Input Shift Value
0 − 25
110 − 25
× {(110 − 105) − (25 − 40)} + (25 − 40) = −20.9 (°C)
260
− 25
110
− 25
× {(110 − 105) − (25 − 40)} + (25 − 40) = 40.3 (°C)
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