US Gauge 656 Data Sheet

Product Data

LIQUID FILLED GAUGES – OPEN FRONT STYLE

Model 656 2-1/2" (63mm) and 4" (100mm)
Open Front Stainless Steel Gauges

8LFG -

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.

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 63 and 100mm sizes.

Model 656

with front flange

Model 656

SPECIFICATIONS

SIZES: 2-1/2" (63mm) and 4" (100mm)

RANGES: 63mm – 30" Hg-0 psi through 0 to 10000 psi

(0 psi to 6000 psi on the lower back mount model)

100mm – 30" Hg-0 psi through 0 psi to 23000 psi

ACCURACY:

Model 6562 (63mm) – ±1.6% of full scale (Grade B)

Model 6566 (100mm) – ±1.0% of full scale (Grade 1A)

BOURDON TUBE: 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) – 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 – 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, 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

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)

* 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 B40.100-2005 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.

On-line order fax: [phone] or e-mail: [e-mail]

Sales/Technical Support: [phone] | 205 Keith Valley Road | Horsham PA 19044 U.S.A.

© 2013, by AMETEK, Inc. All rights reserved. Printed in the U.S.A. PDF513 (160174)

Specifications are subject to change without notice. Visit our Web site for the most up-to-date information.

www.ametekusg.com

Product Data

FILL PLUG

D

B

M

LIQUID FILLED GAUGES – OPEN FRONT STYLE

Model 656 2-1/2" (63mm) and 4" (100mm)
Open Front Stainless Steel Gauges

Pressure Ranges

Ranges**

30" Hg-0

30” Hg-0-15

30” Hg-0-30

30” Hg-0-60

30” Hg-0-100

30” Hg-0-150

0-15 psi

0-30 psi

0-60 psi

0-100 psi

0-160 psi

0-200 psi

0-300 psi

0-400 psi

0-600 psi

0-800 psi

0-1000 psi

0-1500 psi

0-2000 psi

0-3000 psi

0-6000 psi

0-10000 psi

0-14500 psi

0-23000 psi*

* Not available in 63mm

** Metric and dual scale dials are available. Please call Customer Service at

[phone] for more information.

INCHES

(MM)

3-120º

øA

Lower

E

Mount

(Code A)

Center

Back

Mount

(Code F)

63mm

Only

15º

R 1.8 (63mm)

R 2.5 (100mm)

Lower

Back

Mount

Front

Flange

(Code N)

BOLT CIRCLE

DIAMETER

G

Lower

Back

Mount

U-clamp

Front

Flange

(Code T)

63mm

Only

øA

øC

øA

øC

øA

BLOW OUT

DISC

(100mm only)

F

E

D

øB

E

D

F

øB

M

E

D

F

ø

9LFG -

Dimensions

Dial Sizes Mounting Unit A B C D E F G M

63mm

63mm

63mm

63mm

100mm

100mm

© 2013, by AMETEK, Inc. All rights reserved. Printed in the U.S.A. PDF513 (160174)

Specifications are subject to change without notice. Visit our Web site for the most up-to-date information.

LM
LM

CBM
CBM

LBM/FF
LBM/FF

LBM/U-clamp
LBM/U-clamp

LM
LM

LBM/FF
LBM/FF

inches

mm

inches

mm

inches

mm

inches

mm

inches

mm

inches

mm

2.51

63.8

2.51

63.8

2.51

63.8

2.54

64.5

3.99

101.3

3.99

101.4

–
–

2.44

62.0

2.61

66.3

2.64

67.1
–

–

4.06

103.1

–
–

–
–

3.39

86.1

2.99

76.0
–

–

5.16

131.1

1.30

33.0

1.30

33.0

1.30

33.0

1.30

33.0

1.97

50.0

1.97

50.0

2.15

54.6

2.24

56.9

2.24

56.9

2.24

56.9

3.27

83.0

3.27

83.1

On-line order fax: [phone] or e-mail: [e-mail]

Sales/Technical Support: [phone] | 205 Keith Valley Road | Horsham PA 19044 U.S.A.

0.44

11.2
–

–

0.51

13.0

0.51

13.0

0.63

16.0

1.14

29.0

–
–

–
–

2.95

74.9
–

–
–

–

4.57

116.1

–
–

–
–

1.10

27.9

1.10

27.9
–

–

1.77

45.0

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