Heat Cups and Thermocups
Thermocups and cup heaters are designed for controlling the temperature of a mud sample while taking
readings with a rheometer or viscometer. Normal heat-up time is 15 minutes and the pilot light turns
on when the well reaches the set temperature. Drilling fluid has a low thermal conductivity, so it must
be agitated in order to reach a uniform temperature within a reasonable length of time. For safety
considerations, the fluid should never be heated above 200°F (93°C). The rotor and bob should
not be immersed for long periods in the fluid as vapors will rise up into the bearings and condense,
causing corrosion. The holes in the stage of the OFITE Viscometers have been positioned to hold the
heated cups at a 45° angle to the line of the instrument for better accommodation of thermometers and power cables.
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