liquid-in-glass thermometer

A high-quality liquid-in-glass thermometer if handled with care should remain stable for some years.

B40.200 provides guidelines for bimetallic-actuated, filled-system, and liquid-in-glass thermometers.

(This does not apply to full immersion liquid-in-glass thermometers.)

Most liquid-in-glass thermometers are total immersion types and stem corrections are required if not used as stipulated.

A complete range of temperature calibrations is available for resistance thermometers, liquid-in-glass thermometers, thermistors, thermocouples, and optical pyrometers.

There may be other causes due to imperfections in the instrument, e.g. in a liquid-in-glass thermometer if the capillary tube varies in diameter.

Liquid-in-glass thermometers suitable for calibration are generally of the total immersion, ASTM-designated type with Serial Numbers.

All liquid-in-glass thermometers operate on the same basic principle, i.e., the volume of the liquid increases as the temperature rises, thus causing the liquid in the tube to expand.

In an indoor-outdoor thermometer based on a conventional liquid-in-glass thermometer, the stem of the outdoor thermometer is connected to the bulb by a long, flexible or semi-rigid capillary.