Dwyer Instruments Spirahelic 7000 Series Specifications-installation And Operating Instructions

Series 7000 Spirahelic

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]

®

Pressure Indicating Transmitter

Specifications - Installation and Operating Instructions

Bulletin A-33-A

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 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 pro­duced 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

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 selec­table back or bottom connection.
Weight: 17.1 oz. (581 g).

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.

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.

DWYER INSTRUMENTS, INC.

P.O. Box 373 • Michigan City, IN 46361-0373, U.S.A. Fax: [phone] e-mail: [e-mail]

Phone: [phone] www.dwyer-inst.com

Bulletin A-33-A

MAXIMUM VALUE (1300 OHMS)

1400

1300

1200

1100

1000

900

800

700

600

500

400

300

200

100

50

0

5

10

15 20 25

30 35

40

OPERATING

REGION

RECEIVER RESISTANCE (OHMS)

R L MAX =

Vps-10.0

20mA DC

7000 SERIES

INDICATING
PRESSURE

TRANSMITTER

POWER
SUPPLY

10-35 VDC

mA

RECEIVER

page 2

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.

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.

PNEUMATIC CALIBRATION TESTER

Use a dead weight tester or certified test gage with .125%
or better accuracy. The test gage range should be compa­rable to the range of the Spirahelic®Pressure Indicating
Transmitter being checked. Connect the 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 factory.

ELECTRICAL CONNECTIONS
CAUTION: Do not exceed specified supply voltage ratings.

Permanent damage not covered by warranty will result. This
unit is not designed for 120 or 240 volt AC line operation.

Electrical connections to the Series 7000 Spirahelic
Pressure Indicating Transmitter are made at the rear of the
pressure gage. Feed stripped and tinned leads to the termi­nal block screws shown below, refer to Figure A for loca­tions of the terminal block, span and zero adjustments.

2-Wire Operation - A external power supply delivering 10­35 VDC with minimum current capability of 40 mA DC (per
transmitter), must be used to power the control loop. See
Figure B for connection of the power supply, transmitter,
and receiver. The range of the appropriate receiver load
resistance (RL) for the DC power supply voltage available is
expressed by the formula and graph in Figure C. Shielded
two wire cable is recommended for control loop wiring. if
grounding is required use negative side of control loop after
receiver see Figure B.

®

Fig. B

7000

SPIRAHELIC INDICATING TRANSMITTER

MODEL:

RANGE:

SPAN ADJUST

ZERO

SPAN

ZERO ADJUST

TERMINAL BLOCK

PRESSURE RANGING

Each standard Series 7000 Spirahelic

Fig. C

®

Pressure Indicating
Transmitter is factory calibrated to produce a 4 mA output
signal at zero pressure and a 20 mA signal at full scale. Use

Fig. A

the following procedure to check or adjust the output signal
calibration.

1. With the unit connected to its companion receiver and
power supply, an accurate milliammeter should be inserted in
series with the current loop. A controllable pressure source
capable of achieving the necessary full scale pressure
should be connected to the pressure port of the transmitter
and teed to an accurate pressure gage or manometer. The
instrument should be calibrated in the same position in
which it will be used. Vertical mounting is recommended.