Product Data LIQUID FILLED GAUGES – OPEN FRONT STYLE Model 656 2-1/2" (63mm), 4" (100mm) and 6" (160mm) Open Front Stainless Steel Gauges DESCRIPTION The 656 Series are suitable for corrosive environments in chemical, petrochemical, refining, power, marine, and food and pharmaceutical processing applications. Liquid filled pressure gauges provide users with a number of advantages in certain measurement applications. They are ideally suited for uses on equipment where excessive vibration and pulsation are encountered, such as pumps, compressors, machine tools, etc. The liquid fill minimizes the effect of these severe environments, protects the gauge internals, and provides continuous lubrication on the mechanism, all adding up to extended service life. Liquid filling also provides greater protection of the gauge internals from corrosive atmospheres. All Model 656 gauges are made with seamless 316L SST Bourdon tubes, which reduces concerns about tube fatigue and stress corrosion cracking. AMETEK liquid filled gauges can be used with a variety of fill fluids including glycerin, mineral oil, and silicone oil. These gauges are available in 63mm (2-1/2"), 100mm (4"), and 160mm (6") sizes. Model 656 (2-1/2") with front flange RANGES: 63mm – 30" Hg-0 psi through 0 to 10000 psi (0 psi to 6000 psi on the lower back mount model) 100mm and 160mm – 30" Hg-0 psi through 0 psi to 23000 psi ACCURACY: Model 6562 (63mm) – ±1.6% of full scale (Grade B) Model 6566 (100mm) and 6568 (160mm) – ±1.0% of full scale (Grade 1A) BOURDON TUBE: Seamless 316L stainless steel Model 6562 (63mm) – Less than or equal to 800 psi, C type Bourdon tube; greater than or equal to 1000 psi, helical type Bourdon tube Model 6566 (100mm) and 6560 (160mm) – Less than or equal to 1000 psi, C type Bourdon tube; greater than or equal to 1500 psi, helical type Bourdon tube WINDOW: 63mm – Polycarbonate (laminated shatter-resistant glass window optional) 100mm and 160mm – Laminated shatter-resistant glass window MOVEMENT: 304 stainless steel DIAL: White aluminum with black lettering* POINTER: 63mm aluminum alloy, black painted; adjustable pointer on 100mm and 160mm, aluminum black CASE AND BEZEL RING: 304 stainless steel, bayonet type CASE PRESSURE RELIEF: Top – Rubber disc for 63mm; Back – Rubber disc for 100mm PROCESS CONNECTION: 316L stainless steel 63mm – 1/4–18 NPT standard 100mm – Lower mount 1/4–18 NPT or 1/2–14 NPT standard; Lower back mount 1/4–18 NPT standard 160mm – Lower mount 1/2–14 NPT standard WORKING PRESSURE: Steady – 50% of full scale; Over range protection – 125% of full scale WORKING TEMPERATURE: Ambient: -40°F to 140°F (-40°C to 60°C) Fluid: -4°F to 176°F (-20°C to 80°C) WEATHER PROTECTION: NEMA 4X/IP67 * Single scale psi dials are standard, but dials can be changed out at the factory for kPa/psi, kPa, psi/bar, or bar WARNING: Fill fluids can combine with strong oxidizing agents, including (but not limited to) chlorine, nitric acid, and hydrogen peroxide and result in an explosion which can cause property damage and personal injury or bodily harm. If gauges are to be used in such hazardous service, consult factory for other liquid filling and product alternatives. In order to correctly use these gauges, it is recommended that users of pressure gauges become familiar with American National Standard ASME B40.100 entitled “Pressure Gauges and Gauge Attachments.” This specification is available from the American Society of Mechanical Engineers, United Engineering Center, 345 East 47th Street, New York, NY 10017. E-mail: [email protected] Sales/Technical Support: +1 215-674-1234 | 205 Keith Valley Road | Horsham PA 19044 U.S.A. © 2019, by AMETEK, Inc. All rights reserved. Printed in the U.S.A. 7/2019 (160191) Specifications are subject to change without notice. Visit our Web site f

Product Data LIQUID FILLED GAUGES – OPEN FRONT STYLE Model 656 2-1/2" (63mm), 4" (100mm) and 6" (160mm) Open Front Stainless Steel Gauges E FILL PLUG BLOW OUT DISC (100mm only) Center Back Mount (Code F) 63mm Only F Lower Mount (Code A) BOLT CIRCLE DIAMETER G Lower Back Mount Front Flange (Code N) Lower Back Mount U-clamp Front Flange (Code T) 63mm Only Dimensions Dial Sizes LBM/FF LBM/FF LBM/U-clamp LBM/U-clamp LBM/FF LBM/FF E-mail: [email protected] Sales/Technical Support: +1 215-674-1234 | 205 Keith Valley Road | Horsham PA 19044 U.S.A. © 2019, by AMETEK, Inc. All rights reserved. Printed...

Product Data LIQUID FILLED GAUGES - OPEN FRONT STYLE * Metric and dual scale dials are available. Please call Customer Service at+1 215-674-1234 for more information. E-mail: [email protected] Sales/Technical Support: +1 215-674-1234 I 205 Keith Valley Road I Horsham PA 19044 U.S.A. © 2019, by AMETEK, Inc. All rights reserved. Printed in the U.S.A. 7/2019 (160191) Specifications are subject to change without notice. Visit our Web site for the most up-to-date information.

Product Data LIQUID FILLED GAUGES - OPEN FRONT STYLE * Metric and dual scale dials are available. Please call Customer Service at+1 215-674-1234 for more information. E-mail: [email protected] Sales/Technical Support: +1 215-674-1234 I 205 Keith Valley Road I Horsham PA 19044 U.S.A. © 2019, by AMETEK, Inc. All rights reserved. Printed in the U.S.A. 7/2019 (160191) Specifications are subject to change without notice. Visit our Web site for the most up-to-date information.

Product Data LIQUID FILLED GAUGES - OPEN FRONT STYLE * Metric and dual scale dials are available. Please call Customer Service at+1 215-674-1234 for more information. E-mail: [email protected] Sales/Technical Support: +1 215-674-1234 I 205 Keith Valley Road I Horsham PA 19044 U.S.A. © 2019, by AMETEK, Inc. All rights reserved. Printed in the U.S.A. 7/2019 (160191) Specifications are subject to change without notice. Visit our Web site for the most up-to-date information.