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 mea-
sured 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 exceptional responsiveness,
repeatability and accuracy. Because there are no gears,
springs, linkages or other complicated mechanisms, wear is
practically eliminated. The electrical output signal is pro-
duced by a piezoresistive 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 calibrat-
ed. 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 bul-
letin.
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.
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 connection.
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 specifications 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 selec-
table 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.
23/64
[9.13]
120
°
TYP
Ø5-7/8 [149.23]
(3) Ø7/32 [5.56] MOUNTING
HOLES EQUALLY SPACED ON
A 5-3/8 [136.53] BOLT CIRCLE
2-5/32
[54.76]
1-9/32
[32.54]
1 [25.40] SQUARE
CONNECTION BLOCK
1/4 FEMALE NPT
PRESSURE CONNECTION
TYP 2 PLACES
1-13/32
[35.71] 2-1/32
[51.59]
Ø4-41/64
[117.8]
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 4/16/03 10:33 AM Page 1
