LimsPulse
Physical testing

Microbalance

A very sensitive balance that reads to 0.001 mg (1 µg) or better. It is used when the sample is only a few milligrams, for example a potent reference standard or a DSC sample.

  • Pharmaceutical
  • Biotech
  • Chemicals
  • Environmental testing
  • Academic research
  • Materials science
Follow your site SOP
This is a typical operating sequence for learning. Your instrument model and approved SOP take precedence.
STAGE 1

Before you start

  1. 1Check the calibration status label, the minimum weight label and that today's check has been done.
  2. 2Confirm the balance is level (levelling bubble centred).
  3. 3Check the room: doors closed, no draught from air-conditioning, temperature stable.
  4. 4Make sure the balance has been powered for the warm-up time the manufacturer states (often several hours for a microbalance; most labs leave it on standby permanently).
  5. 5Let the sample, container and tools reach room temperature.
  • Do not use the balance if it has been moved, is not level or is past its calibration due date.
  • Do not lean on the weighing table during weighing.
STAGE 2

Weighing

  1. 1Close the draught shield and zero the balance.
  2. 2Pass the container through the ioniser, then place it centrally on the pan with forceps. Close the doors and tare.
  3. 3Open the doors, add the sample with a micro-spatula, and close the doors again.
  4. 4Wait for the stability symbol. At this level it can take 10–30 seconds or more.
  5. 5Print or transfer the stable reading. Check the net weight is at or above the working minimum weight.
  • Handle containers with forceps or gloves only. A fingerprint can weigh several micrograms.
  • Do not breathe on the balance or reach into the chamber while the reading is settling.
  • Use small, light containers so the tare does not use up most of the capacity.
STAGE 3

After use

  1. 1Remove the container and clean the pan and chamber with a soft brush.
  2. 2Close the doors and leave the balance on standby.
  3. 3Complete the usage log.
  • Clean spills of potent powders immediately using the approved procedure; never blow powder out of the chamber.
In LimsPulse · Calibration Management

Keep every Microbalance in control: usage logs, calibration and maintenance schedules, and automatic blocking of overdue instruments.

See how