LimsPulse
Disintegration tester · Calibration procedure

Stroke frequency & distance

Counts the number of up-and-down cycles per minute and measures the vertical travel of the basket-rack.

Illustration of Disintegration tester
PURPOSE

Why this is checked

Both the rate and the length of the stroke control how vigorously the units are agitated, and so affect disintegration time.

Frequency

Typically every 3 to 6 months and after drive maintenance, as defined in your calibration SOP.

Learn how the Disintegration tester works
YOU WILL NEED

Standards & tools

  • Calibrated stopwatch
  • Calibrated vernier height gauge or steel rule
BEFORE YOU START

Prerequisites

  • Basket-rack fitted
  • Apparatus running in the normal mode
PROCEDURE

Step by step

  1. 1Start the apparatus and let it run for a minute to stabilise.
  2. 2Count the complete up-and-down cycles over 1 minute with the stopwatch (or over 2 minutes and divide by two). Repeat for each station.
  3. 3Stop the drive at the lowest point and measure the height of a fixed point on the rack.
  4. 4Move the drive to the highest point and measure the same point again.
  5. 5Stroke distance = highest minus lowest position.
RECORD

Example observation table

StationCycles in 1 minLowest position (mm)Highest position (mm)Stroke (mm)
A3012.067.255.2
B3112.567.454.9
CALCULATION

How to calculate the result

Stroke distance = Highest position − Lowest position
  1. Station A: 67.2 − 12.0 = 55.2 mm (within 53–57 mm)
  2. Frequency 30 cycles/min (within 29–32)
ACCEPTANCE CRITERIA

Pass if

  • Frequency: typically 29–32 cycles per minute.
  • Stroke distance: typically 53–57 mm.
  • Check the current chapter and your SOP for exact limits.
IF IT FAILS

What to do

  • Label the apparatus out of calibration
  • Service the drive and recalibrate
  • Assess the impact on results since the last pass
MORE

Other Disintegration tester 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.

See how