Omega Engineering OS533E manual Figure C-1. Determining Emissivity

CAppendix: Determining an Unknown Emissivity

Method 3

1.Use this method to measure objects at temperatures below 260°C (500°F).

2.Place a large piece of masking tape on the object (or at least a sample of the object material). Allow time for the masking tape to reach the object temperature.

3.Set the emissivity of the thermometer to 0.95. Use the thermometer to measure and record the temperature of the masking tape - Area ‘A’ in Figure C-1. Make sure that the area of the object covered with masking tape fills the FOV of the thermometer.

Area 'A'

Target

Area 'B'

Target

Figure C-1. Determining Emissivity

4.Aim the thermometer at Area ‘B’ as shown in Figure C-1 Make sure that Area ‘B’ is as close as possible to Area ‘A’.

5.Adjust the emissivity of the thermometer until the temperature reading equals the temperature found in Step 3.

C-2