ASTM International's committee on petroleum products, liquid fuels and lubricants (D02) recently approved a new guide (D8164) that provides criteria for selecting digital contact thermometers (DCTs) that will accurately measure temperature when performing test methods.
The guide is expected to help manufacturers, standard developers and users of DCTs in the petroleum industry. The criteria are based on the design and characteristics of liquid-in-glass (LiG) thermometers that have also successfully been used in the committee's test methods.
"The thermal conductivity of a DCT probe is significantly different from that of an LiG thermometer," says Kenneth Henderson of McEinri Associates. "While this may not be a significant issue in stirred baths, it is very significant when measuring the temperature of small static samples."
The standard provides specific parameters for a DCT based on how the current liquid-in-glass temperature measurement device is currently used in a test method. The guide should assist standard developers in establishing criteria for a DCT that is suitable for use in their test methods. DCT manufacturers may also find the guide useful when offering devices and noting performance criteria for customers such as petroleum laboratories.
For more information, watch the accompanying video.