How To Calculate Input Shift Values (2-Point Shift) - Omron E5CN User Manual

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

How to calculate input shift values (2-point shift)

1,2,3...
• The input temperature range of infrared temperature sensors can be
shifted by setting an individual value for the upper and lower points of the
sensor range. This means that the shift can be applied equally across the
range with separate values for each end of the range. For example, if the
upper-limit value is set to "2 ° C" and the lower-limit value is set to "1 ° C",
the sensor range is shifted by an average of 1.5 ° C at 50% input.
• 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 ES1A is connected to the
E5CN, an offset of several to several tens of a degree can occur.
For this reason, offset the readout value by 1-point or 2-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. 2-point shift can be carried out only on infrared temperature sensors,
and cannot be set for other input types.
[Preparations]
1. Set to the temperature range matching the input specifications of the infra-
red temperature sensor. (ES1A is supported only in thermocouple input
types on the E5CN.)
2. Prepare a thermometer capable of measuring the temperature of the con-
trol target as shown in Figure 1 so that 1-point shift or 2-point shift can be
carried out.
Infrared
temperature
sensor
Figure 1 Configuration When Compensating an Infrared Temperature Sensor
Upper-limit temperature input shift value
After shift
Before shift
0
Lower-limit temperature
input shift value
(A) E5CN
Section 4-1
Input
100
(C) Control target
(B) Thermometer
41