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1742 Orbit Way
Minden, NV, 89423
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Direct Drive Design

Helically-Wound Bourdon Tube

The Advantages of DIRECT DRIVE


The primary advantage of Perma-Cal® Direct Drive Pressure Gauges over conventional C-tube type gauges is simple, there is only one moving part.

Our gauges have no gears, linkages, or springs to wear or break.  Perma-Cal® gauges have a unique helically-wound Bourdon tube (elastic element) that is attached directly to the pointer shaft, and due to its configuration, traverses the full arc of the scale.  This provides a very linear reading gauge that maintains its accuracy, and eliminates the need for any movement-amplifying gears or linkages (the parts of a C-tube type gauge that fail most frequently).

Perma-Cal® gauges maintain their structural integrity and accurate calibration in the most demanding environments, even during prolonged and rugged use.  Direct Drive design is ideal for environments experiencing intense vibration, pulsation and shock.  In addition, Perma-Cal® gauges will withstand a 50% overpressure without going out of calibration and are internally dampened to reduce pointer flutter eliminating the need for liquid fill.  

Perma-Cal® Direct Drive pressure gauges provide the lowest cost of ownership by giving the best value in durability, reliability, and accuracy.