The Dwyer Series 7000 Spirahelic
®
Pressure Indicating Transmitter
provides local indication on a large, easy-to-read analog scale while also
converting that pressure into a standard two wire 4-20 mA output signal.
Positive pressure of compatible gases or liquids is measured with 1/2%
of full scale accuracy. The gage employs a triple helix Bourdon tube
movement with direct drive design to reduce friction and mass for excep-
tional responsiveness, repeatability and accuracy. Because there are no
gears, springs, linkages or other complicated mechanisms, wear is prac-
tically eliminated. The electrical output signal is produced by a piezore-
sistive pressure sensor mounted on the pressure block. The pressure
block also includes an integral filter plug to protect the gage interior from
dirt and other particulates. Safety is assured with a solid front case
design and a rear blowout hole.
INSTALLATION
1. Select a location free from excessive vibration where the temperature
limits of 20° to 120°F (-6.7° to 49°C) will not be exceeded. The 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 rearward in the event of failure or the
Bourdon tube element. See complete safety recommendations in this
bulletin.
2. Cut a 4.94˝ (125 mm) mounting hole and drill (3) 7/32˝ (5.56 mm) bolt
holes on a 5.38˝ (137 mm) bolt circle as shown in drawing above. Attach
gage to panel with (3) 3/16˝ bolts of appropriate length.
3. Two 1/4˝ female NPT pressure connections are furnished to allow a
choice of vertical or horizontal piping. The unused port should be
plugged. Use a minimal amount of thread sealant. Too much could block
the internal pressure passage.
Series 7000 Spirahelic
®
Pressure Indicating Transmitter
Specifications - Installation and Operating Instructions
Bulletin A-33-A
SPECIFICATIONS
GAGE SPECIFICATIONS
Service: Compatible gases & liquids
Wetted Materials: Inconel
®
X-750 Bourdon Tube, Type 316L SS con-
nection.
Housing: Black polycarbonate case and clear acrylic cover.
Accuracy: Grade 2A (0.5% F.S.).
Stability: ± 1% F.S./yr.
Pressure Limit: 150% of full scale. Gage will maintain its specifica-
tions for overpressures up to 150% maximum range. Normal operation
should be between 25% and 75% of full scale.
Temperature Limits: 20 to 120°F (-6.67 to 48.9°C).
Size: 4 -1/2˝ dial face (114.3 mm), Design conforms to ASME B40.1.
Process Connections: Two 1/4˝ female NPT field selectable back or
bottom connection.
Weight: 17.1 oz (581 g).
TRANSMITTER SPECIFICATIONS
Accuracy: 0.5% F.S.
Temperature Limits: 20 to 120°F (-6.67 to 48.9°C).
Thermal Effect: ±0.025% F.S. /°F (0.045% F.S./C°).
Power Requirements: 10-35 VDC (2 wire).
Output Signal: 4-20 mA DC.
Zero & Span Adjustments: Externally accessible potentiometers.
Loop Resistance: DC, 0-1250 ohms.
Current Consumption: DC, 38 mA max.
Electrical Connections: Screw Terminals.
Mounting Orientation: Vertical.
Agency Approvals: CE.
(3) ø7/32 [5.56] MOUNTING
HOLES EQUALLY SPACED ON A
5-3/8 [136.53] BOLT CIRCLE
23/64
[9.13]
2-5/32
[54.76]
ø4-41/64
[117.87]
1-9/32
[32.54]
ø5-7/8
[149.23]
120°
1-13/32
[35.71]
2-1/32
[51.59]
1/4 FEMALE NPT
PRESSURE CONNECTION
TYP 2 PLACES
1 [25.40] SQUARE
CONNECTION BLOCK
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. Box 373 • Michigan City, IN 46361-0373, U.S.A.
Fax: 219/872-9057
e-mail:
[email protected]A-33-A:A-33-A 3/1/11 8:24 AM Page 1
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