Emissivity calculator
This tool allows you to calculate the emissivity to be set on the pyrometer for a selected product or to determine the measurement deviation under changing production conditions. While setting the measurement parameters, the result is calculated and displayed in real time.
The correct emissivity to be set on the pyrometer is calculated from the measured value displayed on the pyrometer, the true object temperature, the emissivity preset at the pyrometer and the ambient temperature (required for some instrument types).
The value displayed by the pyrometer is calculated from the true object temperature, the emissivity of the measurement object, the emissivity set on the pyrometer and the ambient temperature (required for some instrument types).
Pyrometer
Quotient
- Two-color mode
- One-color 1
- One-color 2
Preset emissivity
Emissivity ratio to be set
Ambient temperature
Object temperature
Value measured by the pyrometer
Pyrometer
Quotient
- Two-color mode
- One-color 1
- One-color 2
Preset emissivity
Value measured by the pyrometer
Ambient temperature
Object temperature
Emissivity ratio to be set
How can the emissivity be determined?
- Contact measurement: The temperature of the surface is determined using a contact thermometer. The pyrometer is then aligned with the surface. The emissivity on the pyrometer is set so that both devices display the same measured value. The temperature can then be determined on identical surfaces, e.g. in series production, using the pyrometer.
- Reference emissivity: A part of the object to be measured is coated with a matt black paint or covered with adhesive tape or a sticker. These reference surfaces have a defined emissivity of approx. 94 %. The emissivity on the pyrometer is set to 94 % and the temperature of the reference surface is determined. The pyrometer is then aligned directly next to the reference surface for measurement. The emissivity is set so that the measured value corresponds to the reference measured value.
- Quotient pyrometer: In many industrial applications, the correct temperature can be determined using a ratio pyrometer for physical reasons. A spectral pyrometer is aligned to the same position for measurement. The emissivity is set so that the measured value corresponds to the reference measured value.