Dwyer Series GG Instruction Manual
Dwyer Series GG
Dwyer Series GG is a gauge guard designed to protect pressure and vacuum gauges from pulsation, vibration, and overpressure. It is made of glass-filled Polypropylene and has a Viton or Buna-N diaphragm. The GG is compatible with various liquids, including water, mineral oil, and glycerine. The GG can be filled using a vacuum fill method or manually. To fill manually, the bottom face of the 1/4" NPT male instrument fitting must be flat and smooth with a 1/4" maximum hole diameter to seal against the GG port O-ring. The GG should be filled just above the O-ring, tilting the body in all directions to eliminate air.
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INSTALLATION INSTRUCTIONS SERIES GG GAUGE GUARD Materials of Construction: Housing is glass-filled Polypropylene and diaphragm is Viton or Buna-N. Be sure your application is chemically com- patible. Filling: For filling large quantities of gauges, a vacuum fill method is rec- ommended. For manual filling, the method described here works well with 2" bourdon-tube gauges, ranges 60 psi and up. Bottom face of 1/4" NPT male instrument fitting must be fiat and smooth with a 1/4” maximum hole diameter to seal against the О-о ДЕ GG port O-ring (see sketch). > Use a fill liquid suñable for the instrument, gauge guard, diaphragm and operating conditions: water, fi mineral oil, glycerine, etc. 1) Fil the GG 1/47 female port just above the O-ring, tilting body in all directions to eliminate au. 2) Fill hole in the inverted gauge with liquid. With thumb sealing hole and gauge facing palm (in right hand), or away from palm (in left hand), shake vigorously up-and down a dozen times. Add hquid, repeat shaking and filling two more times, finally topping gauge with liquid. Note: DO NOT use thread sealant on gauge threads. Seal only against the O- nag to avoid trapping arr and excess liquid. Dwyer Instruments Inc. 102 Indiana Highway 212 Michigan City, IN 46360 USA Phyo de “ 3) Invert instrument and screw into 1/4" GG por. tt is nomnal for air and excess fill liquid to be forced past tweads during tightening. HAND TIGHTEN ONLY. Continue until the instrument bottoms against the O- ring seal, indicated by increased resistance. H the instrument displays excessive zero offset, back off one turn. Insert eraser end of pencil or 3/8" diameter smooth end rod through the hole in the 1/2” NPT port. Press upward slightly while retightening the instru- ment to expe! a small amount of liquid past the threads. Repeat until off- set 1s corrected; remove the pencil rod. Poor REA will result if too much liquid is expelied. NOTE: After manual gauge filling, test seua unit against a reference gauge. Hf out of tolerance, disassemble and refill. 4) Apply teflon tape or other suitable sealant to the 1/2” NPT male thread. TIGHTEN 8Y HAND, holding targe diameter of the gauge guard. DO NOT tighten by turning the instrument. CAUTION: Over-tightening may damage the piastic thread or housing. Max Pressure Ratings (psig) Temperature Liquids Gases 70-100°F 160 100 100-185°F 160 30 Maximum Temperature is 185% BULLETIN A-30-GG FR#R1-443063-00 11/98 Pressure & Vacuum Gauges Must Be Hand-Tightened Only Against The "Inside O-Ring. Wrenches Can Cause Breakage.
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