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Stability Test
The steps that follow find the As Found and As Left data
for stability.
1. Push to start the furnace.
2. Put TC1 at 0 mm and TC2 at 60 mm.
3. Stabilization time starts after one hour when the
stability indicator shows the furnace temperature is
stable.
4. After the stabilization time, record the temperature on
the readout for TC1 at 1-minute intervals for 30
minutes.
5. Calculate 2σ (2 times the standard deviation) of the 30
recorded measurements.
6. Compare the calculated 2σ with the value in the
stability column of Table 15.
Table 15. Stability Test Data with Isothermal block
Setpoint
Stabilization
Time (min)
(°C)
300
60
700
60
1000
60
1200
60
If the test fails, do steps 4 through 6 again. If it fails a
second time, repair the instability.
Stability 2σ
Samples
Limit (±°C)
30
0.1
30
0.1
30
0.1
30
0.1
Calibration Procedure for Tube Furnace
7. Record the result.
After the stability of the set temperature is verified, it is
recommended that you do the accuracy test that follows.
Accuracy Test
When you do an accuracy test, make sure TC1 is
at 0 mm inside isothermal block
To do an accuracy test:
1. Set the Product to a setpoint temperature in Table 16.
2. Wait for the furnace temperature to become stable.
Use the "Stability Test" above to judge if the
furnace is stable.
3. Record TC1 measurements for 1 minute.
4. Calculate the average of all measurements.
5. Calculate accuracy with:
Accuracy = TC1 – setpoint temperature
6. The accuracy must be ≤±5 °C. If not, do an accuracy
adjustment.
7. Do steps 1 through 6 until the accuracy is ≤±5 °C.
Calibration Furnace
Note
Note
73
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