3D Instruments 25 series Accu-Drive test gauges incorporate the "Direct Drive Difference" Inconel helical bourdon tube system. The "Direct Drive Technology" concept couples the bourdon tube directly to the shaft-pointer, thereby streamlining the design and reducing the number of moving parts from approximately twelve down to one. Thirty years of industrial application have proven that this design is vastly superior to the C-bourdon tube/movement system incorporated in the traditional pressure gauges specially for vibration and pulsation. The Series 25 "Direct Drive Difference" approach applies silicone dampener directly to the bourdon tube. This "coil dampening" approach isolates the pointer from vibration and pulsation, thereby eliminating the requirement for liquid filling of the gauge case. In most instances, a standard 3D Accu-Drive pressure gauge can directly replace an "old fashioned" liquid filled gauge without creating the maintenance headaches cited above. When compared to a liquid filled gauge, the Accu-Drive gauges have been shown to last as much as ten times longer in applications with extreme pulsation and vibration. The net effect of these benefits, coupled with a 6 year product warranty. Additionally, because of a lack of gears and wear points, the Accu-Drive series of gauges maintain their rated accuracy over the entire life of the gauge without the need for costly periodic recalibration. The Series 25 Accu-Drive pressure gauges utilize the finest materials of construction. The bourdon tube is constructed of Inconel, a highly elastic material with excellent corrosion resistance. All other "wetted parts" are 316 Stainless Steel. The balance of the gauge hardware is designed to minimize corrosion associated with challenging field environments. The extremely robust bourdon tube system offers outstanding overpressure protection to 150% of full scale. -65 to +190 degrees F temperature range.
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