Shel lab SVAC9-2, Installation And Operation Manual, Page: 40 / 46

40 | P a g e
Begin Calibration
USER MAINTENANCE
5 ) Heat up and stabilization period : The oven temperature must be stable at temperature and under
vacuum in order to perform an accurate calibration. The temperature is considered stabilized when the
oven chamber has operated at your calibration temperature for at least 30 minutes with no fluctuations
greater than ±0.2°C .
Figure 3: Oven Chamber Heat Up and Stabilization Phases
Continued on next page
Suggested Calibration Procedure
1
Once the chamber has stabilized, compare the reference
temperature device and chamber temperature display
readings.
•
If the readings are the same, or the difference
between the two (2) falls within the acceptable range
of your protocol, the display is accurately showing the
chamber temperature. The Temperature Calibration
procedure is now complete .
•
See Step 2 if a difference falls outside the acceptable
range of your protocol.
Reference Device

2
The display requires a calibration adjustment.
•
The difference between the reference device and the
display is an offset value .
•
Examples of offset values:
Reference Sensor
Reading
Oven Temp
Display
Offset
Value
152.0°C 150°C 2
149.1°C 150°C -0.9
148.0°C 150°C -2
•
Note the offset value for use in Step 5.
Reference Device

150°C
Start
30 Minute Minimum
Stability Period
Heat Up to 150°C:
~120 Minutes
Fluctuations
(Exaggerated)