How To Calculate Input Shift Values For A Two-Point Shift - Omron E5AZ User Manual

Shifting Input Values
Two-point shift
Upper-limit
temperature
input shift
value
Lower-limit
temperature
input shift
value
4-1-2

How to Calculate Input Shift Values for a Two-point Shift

1,2,3...
• Separate shift values can be set for the upper limit and lower limit of the
sensor input range for an infrared sensor. If different shift values are set
for the upper limit and lower limit, then the slope of the line will be different
before and after applying the input shift. For example, if the upper-limit
value is set to 2 ° C and the lower-limit value is set to 1 ° C, the input temper-
ature will be shifted by 1.5 ° C for a 50% input, i.e., by the average of the
upper-limit and lower-limit values.
• Set the upper-limit value in the "upper-limit temperature input shift value"
parameter and the lower-limit value in the "lower-limit temperature input
shift value" parameter.
Temperature
Upper-limit
value
Lower-limit value
When the infrared temperature sensor model ES1B is connected to the E5AZ/
E5EZ, an offset of several degrees to several tens of a degree can occur.
For this reason, offset the readout value by one-point or two-point shift as
described in this item. This offset occurs as a bias current for detecting con-
troller sensor error flows to the output impedance of the infrared temperature
sensor. Two-point shift can be carried out only on infrared temperature sen-
sors, and cannot be set for other input types.
[Preparations]
1. Set a temperature range matching the input specifications of the infrared
temperature sensor. (ES1B is supported only in thermocouple input types
on the E5AZ/E5EZ.)
2. Prepare a thermometer capable of measuring the temperature of the con-
trol target as shown in Figure 1 so that one-point shift or two-point shift can
be carried out.
Upper-limit temperature input shift value
After shift
Before shift
0
Lower-limit temperature
input shift value
Section 4-1
Input
100
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