Manual

The Series 7000 Spirahelic
®
Pressure Gages employ a unique triple
helix Bourdon tube for precision measurement of compatible gases and
liquids. The direct drive design reduces friction and mass, resulting in
exceptionally good responsiveness, repeatability and accuracy. Because
there are no gears, springs, linkages or other complicated mechanisms,
wear is practically eliminated. Solid brass or 316 stainless steel
connection block features convenient dual 1/4˝ female NPT ports-one
each on back and bottom. Block also includes integral filter plug to keep
dirt out. Safety is assured with solid front case design and rear blowout
hole. Gages fit ASME standard panel cutouts, 4.94˝ (125 mm) -7100;
6.5˝ (165.1 mm) -7200; 9.0˝ (229 mm) -7300.
Series 7000 Spirahelic
®
Pressure Gage
Specifications - Installation and Operating Instructions
Bulletin A-33
DWYER INSTRUMENTS, INC. Phone: [phone] www.dwyer-inst.com
P.O. Box 373 • Michigan City, IN 46361-0373, U.S.A. Fax: [phone] e-mail: [e-mail]
Model
7100-XXXXXX
7112-XXXXXX
7114A-XXXXXX
7214A-XXXXXX
7312-XXXXXX
Wetted Parts
Beryllium copper/Brass
Iconel
®
X-750/316 SS
Iconel
®
X-750/316 SS
Iconel
®
X-750/316 SS
Iconel
®
X-750/316 SS
Accuracy
ASME Grade A
ASME Grade 2A
ASME Grade 3A
ASME Grade 3A
ASME Grade 2A
Inconel
®
is a registered trademark of Huntington Alloy Corporation.
SPECIFICATIONS:
Service: Compatible gases & liquids.
Wetted Materials: Iconel
®
Alloy X-750 Bourdon Tube, Type 316L SS
connection block (Grade 2A & 3A Accuracy). Beryllium Copper
Bourdon Tube, nickel-plated brass connection block (Grade A
Accuracy).
Housing: Black polycarbonate case and clear acrylic cover.
Accuracy: Grade A (2%-1%-2%); Grade 2A (0.5% F.S.); Grade 3A
(0.25% F.S.) with mirrored scale.
Pressure Limit: 150% of full scale. Gage will maintain its specifications
for overpressures up to 150% maximum range. Normal operation should
be between 25% and 75% of full scale.
Temperature Limits: -65 to 180˚F (-53.9 to 82.2˚C).
Sizes: 4 1/2˝ dial face (114.3 mm), 6˝ dial face (152.4 mm), 8 1/2˝ dial
face (215.9mm)- Design conforms to ASME B40.1.
Process Connections: Two 1/4˝ female NPT field selectable back or
bottom connection.
Weight: 4 1/2˝ dial face: 16.3 oz. (462.1 g); 6˝ dial face: 19.6 oz.
(555.6 g); 8 1/2˝ dial face: 27.3 oz. (773.9 g).
Standard Accessory: One 1/4˝ male NPT stainless steel plug.
120"
23/64
[9.13]
2-5/32
[54.76]
"E" PANEL CUTOUT
1-13/32
[35.71]
"D"
2-1/32
[51.59]
1/4 FEMALE NPT
PRESSURE CONNECTION
TYP 2 PLACES
1 [25.40] SQUARE
CONNETION BLOCK
(3) "B" MOUNTING
HOLES EQUALLY SPACED
ON A "C" BOLT CIRCLE
"A"
1-9/32
[32.54]
INSTALLATION
1. Select a location free from excessive vibration where the
temperature limits of -65 to 180°F (-53.9 to 82.2°C) will not be
exceeded. Mounting surface should be vertical to match the
position in which all standard gages are calibrated. Avoid locations
in direct sunlight which may cause accelerated discoloration of the
clear acrylic lens or where exposure to oil mist or other airborne
vapors could likewise result in lens damage. Make sure that the
case relief area on the rear is not obstructed. This hole is designed
to direct pressure rear-ward in the event of failure of the Bourdon
tube element. See complete safety recommendations on the back
of this sheet.
2. Make a panel cutout of 4.94˝ (125 mm) for Series 7100 gages, 6.5”
(165.1 mm) for Series 7200 gages or 9.0˝ (229 mm) for Series 7300
gages. See drawing above for bolt circle diameters and bolt hole
sizes.
3. Two 1/4˝ female NPT pressure connections are furnished to allow a
choice of vertical (from below gage) or horizontal piping. The
unused port should be plugged. Use a minimal amount of thread
sealant. Too much could block the internal pressure passage.
CAUTION: When installing fittings or pipe always us a second wrench
on the 1˝ pressure block
DO NOT allow torque to be transmitted from block to the gage case.
CALIBRATION TEST
Use a dead weight tester or certified test gage having accuracy of 1/4%
or better for ASME Grade A gages, 0.1% or better for ASME Grade 2A
or 3A gages. The test gage range should be comparable to the range of
the Dwyer
®
Spirahelic
®
gage being checked. Connect lines from the two
instruments to a tee and the third line from the tee to a controllable
source of pressure. Apply pressure slowly so pressure equalizes
throughout the system. Compare readings. If gage being tested is found
to need calibration, return it, freight prepaid, to the address below.
MAINTENANCE
No lubrication or periodic servicing is required. Keep case exterior and
lens clean. Use only cleaners compatible with acrylic plastic.
REPAIRS
Field repair should not be attempted and may void warranty. Gages
needing calibration or other service should be returned prepaid to:
Dwyer Instruments
Attn: Repair Department
102 Highway 212
Michigan City, IN 46360
Model
7100-
7112-
7114A-
7214A-
7312-
DIM "A"
5-7/8 [149.23]
5-7/8 [149.23]
5-7/8 [149.23]
7-19/32 [192.88]
10-3/16 [258.76]
DIM "B"
7/32 [5.56]
7/32 [5.56]
7/32 [5.56]
9/32 [7.14]
9/32 [7.14]
DIM "C"
5-3/8 [136.53]
5-3/8 [136.53]
5-3/8 [136.53]
7 [177.80]
9-5/8 [244.48]
DIM "D"
4-41/64 [117.87]
4-41/64 [117.87]
4-41/64 [117.87]
6-5/16 [160.32]
8-29/32 [226.22]
DIM "E"
4.940 [125.48]
4.940 [125.48]
4.940 [125.48]
6-1/2 [165.10]
9 [228.60]
A-33:REVISED A-33 3/1/11 7:59 AM Page 1