GMD Gage - PRESO - #2

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Construction and Specifications Model GMD Model GM 1. Place in a convenient location with meter in a vertical plane. 2. Open "Bypass" Valve. 3. Connect Hoses to primary element - RED with upstream side (HI Pressure) and GREEN with downstream side (LO Pressure). Heighten both Hoses to equal elevation to create two even legs. 4- Open HI and LO bleed valves alternately to purge air from system. Drain with convenient blue or clear tube. 5. When bleeding is completed and all air is removed, close "ByPass" valve and read differential pressure. The PRESO system includes conversion charts; read horizontally across from DP to corresponding pipe size, then straight dwon to flow rate. 6. When reading is completed - open "ByPass" valve before disconnecting hoses from meter and/or primary station. - Do not leave liquid in meter below freezing temperature. - Care must be taken not to overpressure meter. - Secure and support hoses to prevent sagging and/or vibration. Normal operation requires no maintenance. In cases where dirt or scale builds up, flush meter with clean water or a compatible solvent. Registered Trademark of PRESO Industries Ltd. Plattsburgh, NY 12901 Montreal, Canada H4R 1E6 OPERATING INSTRUCTIONS CAUTION MAINTENANCE A B 4" DIAL: DIMENSION A = 5-1/4" DIMENSION B = 2-3/4" 6" DIAL: DIMENSION A = 7-1/4" DIMENSION B = 3" 15-1/2" 12-1/2" GM Portable Meter Body Brass or stainless steel Diaphragm Beryllium copper or stainless steel Seals Nitrile rubber or Viton® Dial Face 6" - 270° Arc Dial Case Aluminum with ABS bezel Portable Case Shock resistant vinyl lined Portable Standard ranges include: 0-30", 0-60", 0-100", 0-150", 0-250" H2O, others on application 1/4 SAE SHRAEDER VALVES w/CAP (BLEED PORTS) 1/4 SAE CONNECTIONS (D.P. PORTS) GMD Direct Read Meter Body Brass or stainless steel Diaphragm Beryllium copper or stainless steel Seals Nitrile rubber or Viton® Dial Face 6" - 270° Arc Dial Case Aluminum with ABS bezel Direct Read Any engineering units: GPM, l/s, m3/hr, cfm, psid, etc. Design Features • Accuracy: + 1-3/4% • Maximum overpressure: 60 PSI • Maximum line pressure: 500 PSI • Maximum temperature: 180 °F Preso gages are protected against overload by a unique diaphragm housing design. When the pressure difference exceeds the range, the gage will accept the accidental application up to 60 PSIG without damage. Under normal conditions the differential pressure should not exceed the range of the gage. Model Selector: PGMDƒßƒßƒßƒßƒßƒßƒßƒß TYPE E - STANDARD B - DOUBLE BELLOWS DIAL SIZE 1 - 4" (100 mm) 2 - 6" (150 mm) BODY MATERIAL A - BRASS/BRONZE B - STAINLESS STEEL C - BRASS HI TEMP (320 °F) D - SS HI TEMP (320 °F) X - OTHER FACE PLATE 1 - FLOW UNITS 2 - DUAL SCALE FLOW UNITS 3 - DIFFERENTIAL PRESSURE INSTRUMENT CONNECTION 1 - 1/4" SAE 2 - 1/4" MALE CONNECTOR 3 - 1/8" MNPT 4 - 1/4" MNPT 5 - QUICK CONNECT X - OTHER BY-PASS MANIFOLD 1 - 1-VALVE BY-PASS BRASS 2 - 1-VALVE BY-PASS SS 3 - 3-VALVE BRASS 4 - 3-VALVE SS Z - NOT REQUIRED X - OTHER MOUNTING 1 - PANEL 2 - 2" PIPE DP RANGE * (Determined by Preso) A - 20 B - 30 C - 60 D - 100 E - 120 F - 150 G - 160 H - 200 I - 250 J - 300 K - 400 L - 500 M - 600 * NOTE: X - OTHER For lower DP (0.5 -20.0) please consult Preso 8635 Washington Avenue Tel: 800-632-7337 or 262-639-6770 Racine, WI 53406-3738 USA Fax: 262-417-1148 www.preso.com E-mail: info@preso.com PRESO is a registered trademark of Racine Federated Inc. VITON is a registered trademark of DuPont Dow Elastomers. © 2010 Racine Federated Inc. Printed in USA Form #4-25-29 07/10