---
title: How to set the emissivity
description: 放射温度計で正しく物質表面の温度を測定するには、物質の正確な放射率を設定する必要があります。そのためには物質の放射率を求めることが必要になり、その方法は①接触式の温度計と比較する②黒体塗料（スプレー）や黒体テープを使用する③文献で調査する、の３つあります。当社には放射率が設定可能な製品が揃っております。
image: https://blog.aandd.co.jp/hubfs/AD-5635.png
---

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AD-5611A

## How to set the emissivity

- June 29 2023
- Riho Kato

![放射温度計 AD-5635](https://blog.aandd.co.jp/hubfs/AD-5635.png)

 

Accurate emissivity must be set in order to accurately measure the temperature of the material surface with a radiation thermometer.

For that purpose, it is necessary to obtain the emissivity of the material, and there are three methods.

```

```

①Compare with a contact thermometer (see diagram below)

　The object to be measured that has been adjusted to the actual temperature

　Measure at the same time with a calibrated contact thermometer and the radiation thermometer used.

　Adjust the emissivity setting of the radiation thermometer so that the measured value of the radiation thermometer is equal to

　the measured value of the contact thermometer.

![How to set emissivity using contact type thermemoeter 3](https://blog.aandd.co.jp/hs-fs/hubfs/How%20to%20set%20emissivity%20using%20contact%20type%20thermemoeter%203.png?width=1840&height=1010&name=How%20to%20set%20emissivity%20using%20contact%20type%20thermemoeter%203.png)

②Use black body tape or black body paint (spray) (see below)

　Affix a black body tape or adjust the temperature of the measurement object coated with black body paint

　to the temperature for actual measurement,

　Measured with a radiation thermometer set to the emissivity of black body tape or black body paint (around 0.95).

　So that the temperature display value of the part without black body tape and paint is the same as the measured value

　of the part with black body tape and paint

　Adjust the emissivity setting of the radiation thermometer.

 

 

![Setting emissivity using blackbody tape](https://blog.aandd.co.jp/hs-fs/hubfs/Setting%20emissivity%20using%20blackbody%20tape.png?width=1900&height=1038&name=Setting%20emissivity%20using%20blackbody%20tape.png)

③research in the literature

　Investigate the emissivity described in literature and the web.

　However, with this method, the objects to be measured are not covered,

　Please note that the values ​​may vary depending on the surface condition, temperature, etc.

　A list of representative emissivity for each material is posted in the " [What is emissivity?](https://blog.aandd.co.jp/en/gpdme/ad-5635/housyaritsu?hsLang=en) "article.

 

In our company, we offer products with adjustable (changeable) emissivity ranging from 0.10 to 1.00 in increments of 0.01.

These products include AD-5634, AD-5618, AD-5614, AD-5616, AD-5612WP, and AD-5612A.

 

We also provide a product, AD-5613A, which allows for setting (changing) the emissivity from 0.05 to 1.00 in increments of 0.01.

 

Additionally, we offer a product, AD-5635, which allows for selecting from emissivity options of 0.95, 0.70, and 0.30.

 

We also offer infrared thermometers that can be connected to separately sold thermocouple temperature sensors.

By using the method of "comparing with contact-type thermometers," it becomes easy to set the emissivity.

 

 

 

 

 

###### Tags:

[AD-5611A](https://blog.aandd.co.jp/en/tag/ad-5611a) [Temperature measurement](https://blog.aandd.co.jp/en/tag/temperature-measurement) [How to set the emissivity](https://blog.aandd.co.jp/en/tag/how-to-set-the-emissivity)

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