Refrigeration gauges are generally designed to provide information regarding the operational health of a closed refrigeration system. A wide variety of refrigeration systems require that their pressure and temperature process variables be critically monitored on an on-going basis. These variables may be indicated locally or remotely by a pressure gauge having a dial calibrated in terms of the variable being measured. These compound (capability of measuring both vacuum and positive pressure) gauges are called Refrigeration gauges and provide for a graduated dial of 270 degrees with pressure ranges of either vacuum-150 psi or vacuum-300 psi. Each of these ranges features a dual scale dial...one scale is dedicated for the pressure reading while the other scale is for the "temperature equivalent" value. The "temperature equivalent" scale is based on the refrigerant being used in the system and is provided in red for easy interpretation and analysis.
The Accu-Drive Refrigeration gauges incorporate the 3D Instruments signature "Direct Drive Difference" Inconel helical bourdon tube system. The "direct drive" 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 and movement system incorporated in other pressure gauges...specially for vibration and pulsation!! In many severe service applications, the C-bourdon containing pressure gauges are filled with silicone to both dampen needle movement as well as lubricate their metal movements to extend service life. Besides adding additional cost to the price of the pressure gauge, the case fill liquid causes other operational difficulties…dial discoloration and potential shift of calibration just to mention two of them. In most instances, a standard 3D Accu-Drive Refrigeration gauge can directly replace an "old fashioned" liquid filled Refrigeration gauge without creating the maintenance headaches cited above. When compared to a liquid filled gauge, the Accu-Drive Refrigeration 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 is a dramatic lowering of your cost of ownership!!
Additionally, because of a lack of gears and wear points, the Accu-Drive series of Receiver gauges maintain their rated accuracy over the entire life of the gauge without the need for costly periodic recalibration. All 3D Refrigeration gauges utilize the finest materials of construction. Gauge case materials can be either ABS or Stainless Steel and the bourdon tube is constructed on Inconel, a highly elastic material with excellent corrosion resistance. The wetted parts are of 316SS. 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 on ranges of 30" Hg vacuum-150 psi or 30" Hg vacuum-300 psi psi with various refrigerant scales available. A temperature equivalent scale in red provides an easy analysis of the refrigeration system. Various case styles are available with dial sizes of 2.5", 4.5" and 6" are available.
The combination of lower cost of ownership, long service life, maintenance-free "direct drive" technology and robust design platform makes the Accu-Drive "Direct Drive Difference" Refrigeration gauges from 3D Instruments the ideal choice for your demanding ammonia compressor or refrigeration system pressure monitoring applications.
