Dwyer Series 2-5000 Instruction Manual

Bulletin A-36
Series 2-5000 Minihelic® II Differential
Pressure Gage
®
Specifications - Installation and Operating Instructions
Ø2-19/32
[65.88] Ø3-1/16
[77.79]
1-7/16
[36.51]
9/32
[7.14]
SERIES 2-5000 Minihelic® II Differential Pressure Gages
have clean design, small size, low cost and sufficient
accuracy for all but the most demanding applications.
With housing molded from mineral- and glass-filled
nylon and a lens molded from polycarbonate, this gage
will withstand rough use and exposure, as well as high
total pressure up to 30 psig (2.067 bar). Over-pressure
is accommodated by a blow-out membrane molded in
conjunction with the diaphragm.
INSTALLATION
1. Select a location free from excessive vibration and
where ambient temperature will be between 20°F to
120°F (-6.7°C to 49°C). Sensing lines may be any
length necessary without affecting accuracy.
However, long runs of tubing will dampen readings
slightly and cause a minor increase in response time.
If pulsing pressure or vibration cause excessive
pointer oscillation, please contact factory for ways to
provide additional damping.
2.
This gage is calibrated and zeroed in the vertical
position at the factory. If the gage is used in any other
position, it must be re-zeroed each time the position
is changed. Gages with ranges under 5 inches
w.c. (1.24 kPa), or the equivalent, should be used
only in the vertical position unless special calibration
was specified when ordering.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
2-3/8
[60.33]
1
[25.40]
LOW PRESSURE
PORT Ø7/16 [11.11]
HOLE IN PANEL FOR
SURFACE MOUNT
(2) Ø5/32 HOLES
IN PANEL FOR
SURFACE MOUNT
HIGH PRESSURE
2-21/64
PORT Ø7/16 [11.11]
[59.18]
HOLE IN PANEL FOR
SURFACE
SURFACE MOUNT
MOUNT HOLES
SPECIFICATIONS
Dimensions: 2-29/32″ (73.82 mm) x 2- 7/16″
(61.93 mm).
Weight: 6 oz. (170 g).
Rated Total Pressure: 50 psig (3.445 bar) surge;
30 psig (2.067 bar) continuous to either pressure
connection.
Ambient Temperature Range: 20°F to 120°F
(-6.67°C to 48.9°C).
Accuracy: ± 5% of full scale at 70°F (21.1°C).
Connections: Standard, barbed for 3/16″ I.D. tubing;
optional,1/8″ NPT(M).
Housing: Glass-filled nylon, polycarbonate lens.
Finish: Black.
Standard Accessories: (2) 4-40 x 1-5/8″ mounting
studs, (2) 4-40 hex nuts, (1) .050″ hex allen wrench,
(1) panel mounting bracket.
Mounting Orientation: Diaphragm in vertical position.
Consult factory for other position orientations.
Agency Approvals: Meets the technical requirements
of EU Directive 2011/65/EU (RoHS II).
CAUTION:
Use only with air or compatible non-corrosive gases.
Phone: 219/879-8000 dwyer-inst.com
Fax: 219/872-9057
e-mail: [email protected]
6.
3.
To surface-mount the gage, drill two 5/32″ (3.97 mm)
holes on a horizontal line, 2-1/3″ (59.26 mm) apart for
mounting screws. Next, drill two 7/16˝ (11.11 mm)
holes 1-1/32″ (26.19 mm) apart on a vertical line
for pressure connections. Install mounting studs in
back of the gage, insert through holes in the panel,
and secure with hex nuts provided. Be careful not to
block the slotted hole near the right-hand mounting
hole. This provides a path for pressure relief in the
event of over-pressurization.
4.
To panel-mount gage, cut a 2-5/8″ diameter hole.
Install the mounting studs in the back of gage,
position gage in the panel, and place bracket over the
studs. Thread hex nuts over studs and tighten.
5.
After installation, the gage may need to be zeroed
before placing in operation. If re-zeroing is required,
firmly hold the case of gage with one hand and
unscrew the front cover with the palm of the other
hand in a counterclockwise direction. If difficult to
loosen, place a small sheet of rubber between the
cover and the palm of the hand. Zero-adjust screw
is located behind the scale at the pair marked “zero.”
Use the hex allen wrench supplied and adjust until
pointer is on zero. This must be done with both
pressure connections vented to atmosphere and the
gage oriented in the final mounting position. Replace
cover.
©Copyright 2017 Dwyer Instruments, Inc.
DWYER INSTRUMENTS, INC.
To measure positive pressure, connect tubing to
port marked “HI” and vent “LO” port to atmosphere.
For negative pressure (vacuum), connect to port
marked “LO” and vent “HI” port to atmosphere. For
differential pressure, connect higher pressure to port
marked “HI” and lower to “LO” port. If gage is supplied
with 1/8″ NPT connections, be careful not to overtighten fittings to avoid damage to the gage.
CALIBRATION CHECK
Select a second gage or manometer of known accuracy
and in an appropriate range. Use short lengths of rubber
or vinyl tubing to connect the high-pressure side of the
Minihelic® II gage and the test gage to two legs of a tee.
Very slowly, apply pressure through the third leg. Allow
enough time for pressure to equalize throughout the
system and for fluid to drain. if a manometer is being
used. Compare readings. If the gage being tested
exceeds rated accuracy, it should be returned to the
factory for recalibration.
MAINTENANCE
No lubrication or periodic servicing is required. Keep
case exterior and cover clean. Occasionally, disconnect
pressure lines to vent both sides of the gage to
atmosphere and re-zero per paragraph 5.
Printed in U.S.A. 8/17
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
FR# 440434-00 Rev. 3
Phone: 219/879-8000 dwyer-inst.com
Fax: 219/872-9057
e-mail: [email protected]