Vacuum oven · Calibration procedure
Temperature accuracy
Compares the oven display with a calibrated temperature probe on the shelf at the drying temperatures used.
PURPOSE
Why this is checked
LOD in vacuum specifies a drying temperature. The shelf where samples sit must be at that temperature.
YOU WILL NEED
Standards & tools
- Calibrated digital thermometer with a surface or air probe, traceable to national standards
BEFORE YOU START
Prerequisites
- Probe lead passed through a vacuum-tight port if testing under vacuum
- Oven stabilised at each set point
PROCEDURE
Step by step
- 1Place the probe on the middle shelf.
- 2Set the first temperature (for example 40 °C) and allow it to stabilise for at least 30 minutes.
- 3Record display and reference readings.
- 4Repeat at the other set points (for example 60 °C and 80 °C).
RECORD
Example observation table
| Set point (°C) | Reference (°C) | Difference (°C) |
|---|---|---|
| 40 | 39.4 | −0.6 |
| 60 | 60.8 | +0.8 |
| 80 | 79.1 | −0.9 |
CALCULATION
How to calculate the result
Difference = Reference reading − Set point
- At 60 °C: 60.8 − 60 = +0.8 °C
ACCEPTANCE CRITERIA
Pass if
- Difference within ±2 °C (typical; check your SOP).
IF IT FAILS
What to do
- Label the instrument 'Out of calibration' and stop using it.
- Investigate the cause and arrange adjustment or repair.
- Assess the impact on results generated since the last passing calibration.
- Repeat the full calibration before returning it to use.
MORE
Other Vacuum oven calibrations
In LimsPulse · Calibration Management
LimsPulse schedules this calibration, records the result against limits, and blocks the instrument everywhere if it fails or goes overdue.