Moisture analyser · Calibration procedure
Balance check
Checks the built-in balance with a calibrated weight close to the sample mass range.
PURPOSE
Why this is checked
% moisture is calculated from the initial and final masses, so the balance must read correctly.
Frequency
Typically each day of use (check) and every 3–6 months (calibration), as defined in your SOP.
Learn how the Moisture analyser worksYOU WILL NEED
Standards & tools
- Calibrated weight, for example 50 g (or the weight specified by the manufacturer)
BEFORE YOU START
Prerequisites
- Instrument level, at room temperature and away from draughts
- Pan holder clean
PROCEDURE
Step by step
- 1Fit an empty pan and tare.
- 2Place the calibrated weight on the pan and record the reading.
- 3Remove the weight and check the return to zero.
- 4If adjustment is needed, run the internal or external calibration routine and repeat.
RECORD
Example observation table
| Weight (g) | Reading (g) | Error (g) | % error |
|---|---|---|---|
| 50.000 | 50.003 | +0.003 | +0.006 |
CALCULATION
How to calculate the result
% error = (Reading − Weight value) ÷ Weight value × 100
- (50.003 − 50.000) ÷ 50.000 × 100 = +0.006%
ACCEPTANCE CRITERIA
Pass if
- Within the limit in your SOP (for example ±0.1% of the weight value, or a stated mg value).
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 Moisture analyser 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.