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
PREVENTIVE MAINTENANCE

Maintenance checklist

Daily

  • Check bath temperature against the reference thermometer
  • Check medium level and stirrer operation
  • Inspect viscometers for chips or cracks

Weekly

  • Clean the bath glass and lighting
  • Check holders keep viscometers vertical

Monthly / per SOP

  • Run a certified viscosity standard as a check
  • Replace bath water and add an algicide, or check oil condition

Annual

  • Calibrate the reference thermometer and verify bath uniformity
  • Verify or recalibrate viscometer constants
  • Verify the timer against a reference time signal
  • Service heater, controller and chiller
SAFETY

Safety precautions

Before you work on the Viscosity bath
  • Bath oil at 100 °C causes burns; wear heat-resistant gloves when inserting or removing viscometers.
  • Silicone or white oil used near its flash point is a fire hazard; choose a bath oil whose flash point is well above the operating temperature.
  • Cleaning solvents (petroleum spirit, heptane, acetone, toluene) are flammable; use them in a fume hood away from the bath heater.
  • Glass viscometers break easily; handle with care and dispose of broken glass in a sharps bin.
  • Never use mouth pipetting; use bulbs or vacuum lines.
  • Keep electrical parts dry; wipe up water or oil spills at once.
In LimsPulse · Calibration Management

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

See how