Glass Thermometer For Petroleum Testing

Glass Thermometer, Petroleum Use

ASTM/IP Compliance: Each thermometer is designed to meet specific test requirements (e.g., ASTM 5C, 9C, or 11C), ensuring that your lab results are standardized and globally recognized.

Expansion Chamber safety: Equipped with a safety expansion chamber at the top of the capillary to prevent breakage if the temperature exceeds the scale limit.

$1.47

Quick Answer: The Glass Thermometer, Petroleum Use is a liquid-in-glass thermometer intended for testing petroleum products such as fuels, lubricating oils and bitumen, where each test method names the thermometer’s range, immersion depth and scale divisions. This petroleum thermometer’s exact pattern is confirmed on request against the method you use.

Why Petroleum Tests Specify Their Thermometer

Petroleum testing is highly standardised. Flash point, distillation range, cloud and pour point, kinematic viscosity and density measurements each depend strongly on temperature, and the published methods do not simply say ‘use a thermometer’. They define it: the scale range, the size of each division, the overall length and, importantly, how deep it is immersed. Two laboratories testing the same fuel can only agree if they read the same kind of thermometer in the same way.

Immersion depth matters because only part of a glass thermometer is usually in the sample. A total-immersion thermometer reads correctly only when the whole liquid thread is surrounded by the medium; a partial-immersion thermometer has an etched immersion line and reads correctly with only the part below that line immersed and the rest in room air. Using one in place of the other gives a systematic error, which grows at high temperatures.

The title confirms glass construction and petroleum use but not the range, immersion type or filling liquid. When you enquire, quote the test method and the thermometer designation it calls for, so LabEquip can match the item. Where the thermometer contains mercury, handle and store it under the precautions set by your laboratory.

Specifications

Type	Liquid-in-glass thermometer for petroleum testing
Typical tests	Flash point, distillation, cloud and pour point, viscosity baths, density
Key parameters	Range, divisions, length and immersion depth set by the test method
Immersion	Total or partial (partial types carry an immersion line)
Reading	At eye level, level with the top of the liquid column
Range, immersion type and filling	Confirm at enquiry

Applications

Flash point determinations on fuels and lubricating oils
Distillation range testing of petrol, diesel and solvents
Cloud point and pour point tests on oils and fuels
Temperature of constant-temperature baths in viscosity and density work
Teaching fuel testing in chemical and petroleum engineering courses

Care & Handling

Immerse the thermometer exactly to its immersion line, or fully for a total-immersion type, as the method requires.
Wipe oil off with a solvent-dampened cloth and then detergent solution; never heat the glass to burn residue off.
Store thermometers horizontally or hanging in a rack, never loose in a drawer where the bulbs can be knocked.
Compare with a reference thermometer periodically, and look for gaps in the liquid column before each use.

Why Choose LabEquip

Refinery and fuel-depot laboratories, oil testing labs and engineering colleges buy petroleum thermometers method by method, as each test calls for its own pattern. LabEquip lists this item in its General Lab Products range with the inclusion thermometer for general bath work; send LabEquip the method and thermometer designation.

Frequently Asked Questions

Why does each petroleum test name its own thermometer?

Results of tests such as flash point or distillation depend strongly on temperature, so the method fixes the thermometer’s range, divisions and immersion depth. Using the specified pattern lets results from different laboratories be compared.

Total immersion or partial immersion: what changes?

The calibration. A total-immersion thermometer was calibrated with all of its liquid thread in the bath or sample; a partial-immersion one carries an etched line and was calibrated with only the stem below that line immersed. Use each exactly as calibrated.

How do I order the correct thermometer?

Quote the test method and the thermometer designation or number it specifies, together with the range. LabEquip can then match the pattern; the title alone does not identify it.

Can a glass thermometer be used above its scale?

No. Heating a liquid-in-glass thermometer beyond its range can burst the bulb or separate the liquid column permanently. Choose a thermometer whose range covers the whole test.

How should I clean oil from the thermometer?

Wipe it with a cloth dampened with a suitable solvent, then wash with detergent solution and rinse. Avoid abrasive cleaners, which can damage the etched scale.

What if the liquid column has a gap?

A broken column gives a false reading. Chilling the bulb in ice draws the liquid down and may reunite it; if the gap remains, replace the thermometer.

Last Updated: September 2026