ES1C

3

Characteristics of Infrared Thermosensors

1. Principles of Infrared Thermosensors

The ES1C uses thermopile light-receiving elements to receive

the specific wavelengths (8 to 14

μm) in the infrared range ra-

diated from the measurement range of the measurement ob-

ject, converts the received light into an output signal in the

internal circuits, and outputs a current that corresponds to the

measured temperature.

2. Measurement Error due to Emissivity

The ES1C outputs a current of 4 to 20 mA for measurement

object temperatures of 0 to 400

°C at a emissivity of 0.95. If the

emissivity of the measurement object is less than 0.9, the ef-

fects of the ambient temperature will cause measurement er-

ror. Glossy metal surfaces generally have an extremely low

emissivity, and so operation is easily affected by the ambient

temperature, and it is difficult to measure the temperature of

the measurement object. (Refer to the emissivities that are

given on page 5.)

In an application like this, select a location with a high emissiv-

ity, or use Black spray or Black tape as necessary.

Setting and Adjusting the Connected Device

This section describes an example of making settings and adjustments when a Digital Temperature Controller and Digital Panel

Meter are connected.

1. Mounting

• Select a location with a high emissivity for the object to be

measured. If required, use Black spray or Black tape.

• Secure the Thermosensor with the enclosed lock nuts. Use

a tightening torque of 20 N·m max.

• Mount the Thermosensor so that it is perpendicular to the

object to be measured.

• Mount the Thermosensor in a location that is not subject to

ambient temperatures above 70

°C, to direct hot air, etc.

2. Setting the Connected Device

Make the settings so that 0.0 to 400.0

°C is displayed for an

output of 4 to 20 mA for the ES1C.

* For details, refer to the User’s Manual for the connected device.

3. Adjusting the Connected Device

Error may occur due to the emissivity of the measurement en-

vironment or measurement object. There are two easy meth-

ods that can be used to adjust the error: simple shifting and

two-point shifting, as described in the following section.

● Adjustment Example for the E5@N-L (Analog Input) *

* E5@N Series have been discontinued at the end of March 2017.

A Shift Method

1. Measuring the Temperature of the Measurement Object

Use the thermometer (B) to measure the actual tempera-

ture when using the measurement object (C).

2. Shifting the Display Value of the Connected Device

Adjust the settings of the connected device after checking

the following value:

Temperature B (thermometer)

− Temperature A (connect-

ed device)

If temperature B minus temperature A is 10.0, adjust the

settings so that measurement value of the connected de-

vice is +10.0.

• Scaling upper limit = 4,000 to 4,100

• Scaling lower limit = 0 to 100

(The setting for the decimal point position is 1, and so the

scaling set value will be increased by 100 for a displayed

value of +10.0.)

Thermopile

Internal circuit

Output signal

(4 to 20 mA)

E5

@N-@L Digital Temperature

Controller (Analog Input)

K3GN-ND

@ Digital Panel

Meter (DC Input)

Input type

0 (4 to 20 mA) Input type

Analog

Scaling upper limit

4,000

Analog range

scaling input value 1

4 to 20

4.00

Scaling lower limit

0

Scaling display value 1

scaling input value 2

0

20.00

Decimal point

position

1

Scaling display value 2

4,000

Decimal point

position

0000.0

Measurement object (C)

Thermometer (B)

Power supply (D)

Connected device (A)

ES1C

Setup for Adjustment

Before shift

After shift

+10.0

Value indicated by connected device (A)

Value indicated after

shift (e.g., 100.0)

Value indicated before

shift (e.g., 90.0)

Measurement object

temperature (e.g., 100

°C)

(

°C)

(

°C)

Temperature indicated

by thermometer (B)