Not just another pretty gage, the Series
7000 SpirahelicŪ Direct Drive Pressure Gages
were originally developed in response to military needs
for unbelievable resistance to shock and vibration while
delivering premium accuracy. The Dwyer SpirahelicŪ features
a triple coil spiral/helical wound Bourdon tube which provides
the ultimate in operator safety while continuing to incorporate
the advantages of a low inertia movement without gears or
linkages. This low inertia movement is provided by the unique
Bourdon tube design which eliminates complex mechanical
movements such as gears that are common in conventional
'C' Bourdon tube gages which wear and cause inaccuracy or
early failure. Expensive and leaky liquid filled gages are
no longer necessary due to the triple wound Bourdon design
which withstands shock and vibration.
The direct drive of lightweight, precision
balanced pointer reduces friction and mass, improving responsiveness
and accuracy. So well, in fact, that on ASME Grade 2A or
3A models the accuracy is built in for life! Center post
bearing carrier ensures precise bearing alignment for nearly
friction free operation. Low volume Bourdon tube reduces
fluid volume and stored energy, reducing potential for damage
if tube ruptures from overpressure or other causes. A large
area filter keeps dirt out and restricts flow from damaging
the Bourdon tube. The smaller diameter tubing combined with
a solid front case and rear blowout plug provides added
safety.
Convenience is enhanced by dual bottom and
back process connections on panel mount models while Turret
housing gages possess a dual 1/4" female NPT and 1/2" male
NPT bottom connection. Impact resistant plastic case is
sized to conform to ASME B40.1, replacing existing gages
without changes in panel cutout or mounting holes. Compound
ranges are available in either panel or turret style housings
for applications where vacuum is present in the process.
SPECIFICATIONS
Series 7112, 7212, 7312
Service: Compatible gases & liquids.
Wetted Materials: InconelŪ X-750 alloy Bourdon tube,
type 316L SS connection block.
Housing: Black polycarbonate case and clear acrylic
cover.
Accuracy: Grade 2A (0.5% F.S.).
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 (215.9 mm) - 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.
SPECIFICATIONS
Series
7114A, 7214A, 7314A
Service: Compatible gases & liquids.
Wetted Materials: InconelŪ X-750 alloy Bourdon tube,
type 316L SS connection block.
Housing: Black polycarbonate case and clear acrylic
cover.
Accuracy: 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 (215.9 mm) - 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.
SPECIFICATIONS
Series 7214D, 7314D
Service: Compatible gases & liquids.
Wetted Materials: InconelŪ X-750 alloy Bourdon tube,
type 316L SS connection block.
Housing: Black polycarbonate case and clear acrylic
cover.
Accuracy: 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: 6" dial face (152.4 mm), 8 -1/2" dial face
(215.9 mm) - Design conforms to ASME B40.1.
Process Connections: Two 1/4" female NPT field selectable
back or bottom connection.
Power Requirements: 10-35 VDC, 16-26 VAC.
Current Consumption: 38 mA max (DC); 76 mA max (AC).
Weight: 6" dial size: 20.7 oz (586.8 g); 8-1/2" dial
size: 26.1 oz (739.9 g).
ACCESSORIES -- See
"Ordering" Page
A-341, Brass Adapter, 1/4"
male NPT to G 1/2 A (per ISO 228/1) parallel thread 2-1/2"
length.
A-341-1, Brass Adapter,
1/2" male NPT x 1/4" female NPT, 3-3/4" length.
