Dwyer 3000MR - Manual

Series 3000MR Photohelic ® Differential Pressure Switch/Gage
Specifications — Installation and Operating Instructions
Bulletin E-70
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
O
.2O .4O .60 .80
1.0
INCHES OF WATER
1/8 FEMALE NPT HIGH
PRESSURE CONNECTION
1/8 FEMALE NPT HIGH
PRESSURE CONNECTION
2-1/61
[52.39]
2
[50.80]
(4) 6-32 HOLES
EQUALLY SPACED ON A
5-1/8 [130.18] B.C.
1-1/4
[31.75]
Ш4-47/64
[120.25]
Ш5
[127.00]
Ш4 [101.60]
FACE
5-1/2 [139.70] O.D.
MOUNTING RING
5/8
[15.88]
1/8 FEMALE NPT LOW
PRESSURE CONNECTION
5/8 [15.88]
PANEL MAX
3/16
[4.76]
2-1/2
[63.50]
ELECTRICAL CONNECTIONS
CAUTION: Do not exceed specified electrical rat-
ings. Permanent damage not covered by warranty
will result. This unit is not designed for AC line volt-
age operation.
Electrical connections are made by means of the cable assembly
supplied which has a multi-pin female plug installed on one end
which mates with the male connector on the rear of the gage. Wire
leads on the opposite end of the assembly are connected in
accordance with the drawing and chart to the right.
Note: An R/C (resistor/capicitator) snubber is required when
switching inductive loads such as a solenoid or contactor.
specify Dwyer Instruments, Inc. part number A-600. For DC
circuits, also include a 1N4005 diode.
Using solid state technology, the Series 3000MR Photohelic ®
switch/gage combines the functions of a precise, highly repeat-
able differential pressure switch with a large easy-to-read analog
pressure gage employing the durable, time-proven Magnehelic
®
gage design. Switch setting is easy to adjust with large external
knobs on the gage face. Gage reading is unaffected by switch
operation — will indicate accurately even if power is interrupted.
Solid state design now results in greatly reduced size and weight.
Units can be flush mounted in 4
13 ⁄
16
˝ (122 mm) hole or surface
mounted with hardware supplied. 3000MR models employ versa-
tile electromechanical relays with gold over silver contacts — ideal
for dry circuits. All models provide both low and high limit control
and include 18-inch (45 cm) cable assemblies for electrical con-
nections.
Gage accuracy is ±2% of full scale and switch repeatability is
±1%. Switch deadband is one pointer width — less than 1% of
full scale. Compatible with air and other non-combustible, non-
corrosive gases, they can be used in systems with pressures to
25 psig (1.725 bar). Optional construction is available for use to
either 35 psig (2.42 bar) or 80 psig (5.51 bar).
Accessories
Mounting ring, snap ring (4) 6-32 x 1 1 ⁄ 4 ˝ RH machine screws
18˝ (45 cm) cable assembly (panel mounting)
(2) 3 ⁄
16
˝ tubing to 1 ⁄
8
˝ NPT adapters (3) 6-32 x 5 ⁄
16
˝ RH machine screws
(2) 1 ⁄
8
˝ NPT pipe plugs (surface mounting)
SPECIFICATIONS
GAGE SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult Factory.
Accuracy: ±2% of full scale (3000-0 ±3% of full scale).
Pressure Limit: -20˝ Hg. to 25 psig (-0.677 bar to 1.72 bar). MP option;
35 psig (2.41 bar), HP option; 80 psig (5.52 bar).
Temperature Limits: 20 to 120°F. (-6.67 to 48.9°C).
Process Connections: 1/8 female NPT (duplicated side and back).
Size: 4˝ (101.6 mm) dial face, 5˝ (127mm) O.D. x 3-1/8˝ (79.38 mm).
Weight: 1.8 Ib., (816 g).
SWITCH SPECIFICATIONS 3000MR
Switch Type: Each setpoint has 1 Form C relay (SPDT).
Relay Contacts: (resistive load) 1 Form C rated 1.0 amp @ 30 VDC, 0.3
amp @ 110 VDC or 0.5 amp @ 125 VAC. Gold over clad silver - suitable
for dry circuits.
Electrical Connections: 18˝ (46 cm) cable assembly with 8 conductors.
Optional lengths to 100´ (30.5 m).
Power Requirements: 24 VDC, regulated ± 10%.
Mounting Orientation: Diaphragm in vertical position. Consult factory for
other position orientations.
Set Point Adjustment: Adjustable knobs on face.
LETTER
A
E
C
B
D
H
J
F
COLOR
Red
Black
Brown
Violet
Blue
Green
White
Orange
Power
Supply
Low
Set Point
High
Set Point
+
-
COM
NC
NO
COM
NC
NO
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