Analytical balance
Measures the mass of a sample very precisely, usually to 0.1 mg or 0.01 mg. Almost every quantitative test in a QC lab starts with a weighing, so the balance is the most used instrument in the lab.
- Pharmaceutical
- Biotech
- Chemicals
- Food & beverage
- Academic research
- Cosmetics
Analytical balance calibration procedures
Daily performance check
A quick check before first use each day, weighing one or two calibrated weights to confirm the balance still reads correctly.
Open procedureRepeatability
Weighs the same test weight ten times and calculates the standard deviation. This is the most important check for small weighings.
Open procedureAccuracy
Weighs a calibrated test weight near the top of the range and compares the reading with its certified value. Also called a sensitivity test.
Open procedureEccentricity
Places the same weight in the centre and at four corners of the pan and checks the readings agree.
Open procedureLinearity
Weighs several calibrated weights across the range, from low to near full capacity, and checks each reading is correct.
Open procedureMinimum weight
Determines the smallest net sample mass that can be weighed on the balance while meeting the 0.10% accuracy requirement.
Open procedureInstrument qualification (DQ · IQ · OQ · PQ)
- 01
DQ — Design qualification
Defines what is needed: capacity, readability, minimum weight for the smallest samples, data interface and compliance features (user log-in, audit trail).
- 02
IQ — Installation qualification
Confirms correct installation on a stable, level bench away from draughts and vibration, records the serial number, firmware and accessories, and checks the power supply.
- 03
OQ — Operational qualification
Tests the balance against specification: repeatability, accuracy (sensitivity), eccentricity and linearity, using calibrated test weights.
- 04
PQ — Performance qualification
Shows the balance performs consistently in routine use, through daily checks and periodic repeatability and minimum weight checks at the place of use.
Keep every Analytical balance in control: usage logs, calibration and maintenance schedules, and automatic blocking of overdue instruments.