LimsPulse
Petroleum testing

Kinematic Viscosity Bath

A clear, stirred liquid bath held to within about ±0.02 °C, in which calibrated glass capillary viscometers are timed. Flow time multiplied by the viscometer constant gives kinematic viscosity in mm²/s (cSt).

  • Lubricant blending
  • Petroleum refining
  • Fuel terminals
  • Marine fuel testing
  • Fleet and machinery oil condition monitoring
  • Independent testing laboratories
Illustration of Kinematic Viscosity Bath
CALIBRATION

Viscosity bath calibration procedures

Bath temperature verification

Checks the viscosity bath temperature with a calibrated reference thermometer at each test temperature, at the viscometer positions and over time.

Open procedure

Viscometer constant verification

Measures the flow time of a certified viscosity standard in a routine viscometer and compares the calculated constant with the certified constant.

Open procedure
QUALIFICATION

Instrument qualification (DQ · IQ · OQ · PQ)

  1. 01

    DQ — Design qualification

    Specifies temperatures needed (for example 40 °C and 100 °C), stability (about ±0.02 °C), number of viscometer positions, bath medium, thermometer type, automation and data integrity needs, against ASTM D445 / ISO 3104.

  2. 02

    IQ — Installation qualification

    Confirms installation, bath medium filled, viscometers and holders supplied with certificates, reference thermometer calibrated and documents recorded.

  3. 03

    OQ — Operational qualification

    Checks temperature accuracy and stability at each test temperature, uniformity across viscometer positions, timer accuracy and holder verticality.

  4. 04

    PQ — Performance qualification

    Measures certified viscosity standards with routine viscometers and shows results within tolerance, then tracks a check standard on a control chart.

In LimsPulse · Calibration Management

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

See how