4

Infrared Thermosensor

ES1B

■ 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)

Example for the E5CN

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

■ 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

Lower-limit Temperature Input Setting

Upper-limit Temperature Input Setting

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.

−

+

(C) Sensing

object

ES1B Infrared

Thermosensor

Output

(+,

−)

Power supply

(+,

−)

(A) Temperature

Controller

(B) Thermometer

Power

Supply

insl

10

C

insh

10

C

Lower-limit

temperature input

Upper-limit

temperature input

Temperature indicated

by Controller (A)

Indicated temperature

after offset

(e.g., 120˚C)

Indicated temperature

before offset

(e.g., 110˚C)

0

After offset

Input offset value

(e.g., 10˚C)

Before offset

Temperature

indicated by

thermometer (B)

Near set point

(e.g., 120˚C)

YL

-Y1

´{(X2-Y2)-(X1-Y1)}+(X1-Y1)

Y2

-Y1

YH

-Y1

´{(X2-Y2)-(X1-Y1)}+(X1-Y1)

Y2

-Y1

0

Indicated temp. after

offset, X2 (e.g., 110˚C)

Indicated temp. before

offset,Y2 (e.g., 105˚C)

Indicated temp. after

offset, Y1 (e.g., 40˚C)

Indicated temp. after

offset, X1 (e.g., 25˚C)

X1, Room temp.

(e.g., 25˚C)

Lower limit of

set range,

YL (e.g., 0˚C)

Upper limit of

set range, YH

(e.g., 260˚C)

Upper-limit

temperature input

insh

Lower-limit

temperature

input

insl

Temperature indicated

by Controller (A)

After offset

Before offset

Temperature

indicated by

thermometer (B)

X2, Near set point

(e.g., 110˚C)