Mechanical Registration - Fixed Gravity TVC

A positive displacement meter measures gross volume regardless of temperature and/or specific gravity. On those products with linear coefficient of expansion, a Temperature Volume Compensator automatically corrects registration to indicate the volume of the liquid at a selected base temperature normally 60°F (15"C). A Temperature Volume Compensator should be used in a meter assembly based on one or more of the following considerations:

• The magnitude of the coefficient of expansion of a product.
• The magnitude of variation in product temperature.
• The commercial value of the product.
• The degree of metering accuracy desired.
• The requirement that the product be measured by weight instead of volume.

The Temperature Volume Compensator contains an infinitely variable transmission, which reacts to product and ambient temperature sensed by a fluid filled capillary system connected to a bellows. Changes in product temperature produce changes in the bellows length. This change in length is sensed and mechanically transmitted to a differential.