ES1B Datasheet, PDF (4/8 Pages) Omron Electronics LLC – Infrared Thermosensor

■ One-point Input Shift
Preparations
• Set a temperature input range that is suitable for the input
specifications of the Infrared Thermosensor.
• Prepare a thermometer to measure the temperature of the sensing
object as shown in figure 1, below.
Configuration for Offsetting the Infrared
Thermosensor Input (Figure 1)
(C) Sensing
object
ES1B Infrared
Thermosensor
Output
(+,−)
(A) Temperature
Controller
Power
Supply
Example for the E5CN
−
+
(B) Thermometer
Power supply
(+,−)
C _insl C _insh
10
10
Lower-limit
temperature input
Upper-limit
temperature input
1. Adjust the temperature of the sensing object in the configuration
shown in figure 1 to near the set point. We will assume that the
temperature indicated on the thermometer is the actual
temperature of the sensing object.
2. Check the temperature C of the sensing object and the
temperature A indicated on the Controller and set both the upper-
limit and lower-limit temperature input settings to the following
value:
Temperature C (sensing object) - Temperature A (Controller)
3. Check the temperature C of the sensing object and the
temperature A indicated on the Controller again. If they are about
the same, then setting the offset has been completed.
Diagram of One-point Input Shift
Temperature indicated
by Controller (A)
Indicated temperature
after offset
(e.g., 120˚C)
Indicated temperature
before offset
(e.g., 110˚C)
After offset
Input offset value
(e.g., 10˚C)
Before offset
■ Two-point Input Shift
Use a two-point input shift to output more accurate display values
than is possible with a 1-point input shift.
Preparations
Refer to the preparations for a one-point input shift.
1. The input value is shifted at two points: near room temperature
and near the set point. To do so, first check the temperature C of
the sensing object and the temperature A indicated on the
Controller at both near room temperature and near the set point.
2. Use the following formulas to calculate the upper-limit
temperature input and lower-limit temperature input settings
based on the values checked above.
Diagram of Two-point Input Shift
Temperature indicated
by Controller (A)
Upper limit of
set range, YH
(e.g., 260˚C)
Indicated temp. after
offset, X2 (e.g., 110˚C)
Indicated temp. before
offset,Y2 (e.g., 105˚C)
After offset
Upper-limit
temperature input insh
Before offset
Indicated temp. after
offset, Y1 (e.g., 40˚C)
Indicated temp. after
offset, X1 (e.g., 25˚C)
Lower-limit
temperature
input insl ₀
X1, Room temp. X2, Near set point
Lower limit of _{(e.g., 25˚C)}
(e.g., 110˚C)
set range,
YL (e.g., 0˚C)
Lower-limit Temperature Input Setting
Temperature
indicated by
thermometer (B)
insl=
YL-Y1
Y2-Y1
´{(X2-Y2)-(X1-Y1)}+(X1-Y1)
Upper-limit Temperature Input Setting
insh=
YH-Y1
Y2-Y1
´{(X2-Y2)-(X1-Y1)}+(X1-Y1)
3. Set both the upper-limit and lower-limit temperature input settings
and then check the temperature C of the sensing object and the
temperature A indicated on the Controller both near room
temperature and near the set point.
4. Although here we have used two points, near room temperature
and near the set point, accuracy can be increased even further by
using another point within the measurement temperature range
other than the set value instead of room temperature.
0
Near set point _Temperature
(e.g., 120˚C) _{indicated by}
thermometer (B)
4
Infrared Thermosensor ES1B