LimsPulse
Environmental monitoring

Jar Test Apparatus

A bank of four to six paddle stirrers that mix identical water samples in beakers with different doses of coagulant, so the analyst can find the dose that gives the best floc formation and settling.

  • Drinking water utilities
  • Municipal and industrial wastewater treatment
  • Chemical suppliers (coagulant trials)
  • Paper, textile and mining industries
  • Universities and training
Photo of a Jar Test Apparatus
Photo: NOIRLab/NSF/AURA, CC BY 4.0 (cropped), via Wikimedia Commons
CALIBRATION

Jar tester calibration procedures

Paddle speed check

Verifies with a calibrated tachometer that each paddle turns at the set speed across the rapid- and slow-mix range.

Open procedure
QUALIFICATION

Instrument qualification (DQ · IQ · OQ · PQ)

  1. 01

    Design qualification (DQ)

    Specify number of positions, speed range (for example 10–300 rpm), jar type and illumination.

  2. 02

    Installation qualification (IQ)

    Record serial numbers, check paddles are aligned and at equal height, and check the controller and timer work.

  3. 03

    Operational qualification (OQ)

    Verify paddle speeds at low, medium and high settings with a calibrated tachometer and verify the timer.

  4. 04

    Performance qualification (PQ)

    Run duplicate jars at the same dose and show settled turbidity agrees within the lab's limits.

In LimsPulse · Calibration Management

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

See how