Glass thermometers are one of the most common types of temperature instruments and are available in a variety of styles, sizes, and versions. Their unique characteristics of wide range, precision, repeatability, and quick response create a unique challenge for the metrologist who is calibrating these instruments. InnoCal can calibrate spirit-in-glass (SIG) thermometers. Calibrations for glass thermometers use direct comparison in high-stability liquid baths using Precision Reference Thermometers (PRTs) and Standard Platinum Resistance Thermometers (SPRTs) and high precision displays. The glass thermometers are inspected for cracks and liquid-column separations before testing.
Calibrations on glass thermometers are performed using direct comparison in high-stability liquid baths using high-precision PRT’s and SPRT’s and displays. Thermometers are inspected for cracks and liquid-column separations before testing. Measurements are performed at 2 to 4 points between -197 deg C and 550 deg C.
Points are generally selected at the manufacturer’s specified points but customer-specified points can be accommodated. For certificates with more calibrations points, see 17006-05 for 5 to 9 points, and 17006-06 for 10 to 15 points.
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