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Dwyer 3000 User Manual

Dwyer instruments, inc, Series 3000 photohelic, Pressure switch/gage

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The Photohelic

®

Switch/Gage is a very versatile, precise pressure

switch combined with the time-proven Magnehelic

®

pressure gage.

Models are available with one or two phototransistor actuated relays.
Gage reading is unaffected by switch operation. Easy to adjust set points
have knob controls. Applied pressure and switch set points are fully
visible at all times. Deadband is one pointer width - less than 1% of full
scale. Double-pole double-throw relays can be easily interlocked to
provide variable deadband control. For positive, negative or differential
pressure only on 3600S models. Full scale ranges available from 0-.25
in w.c. to 0-6000 psig.

PHOTOHELIC

®

GAGE SENSING - HOW IT WORKS

In a typical control application, the Photohelic

®

switch/gage controls

between high and low pressure set points. When pressure changes,
reaching either set point pressure, the beam from an LED to the limiting
phototransistor will be cut off by the helix-driven light shield. The
resulting signal change is electronically amplified to actuate its DPDT
slave relay and switching occurs. Dead band between make and break
is 1% of full scale or less - just enough to assure positive, chatter-free
operation.

Series 3000 Photohelic

®

Pressure Switch/Gage

Specifications - Installation and Operating Instructions

Bulletin B-33

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]

SPECIFICATIONS
GAGE SPECIFICATIONS
Service:
Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Accuracy: ±2% of full scale at 70°F (21.1°C). ±3% on -0 and ±4% on
-00 models.
Pressure Limits: -20˝ Hg. to 25 psig (-0.677 to 1.72 bar). MP option;
35 psig (2.41 bar), HP option; 80 psig (5.52 bar). 36003S – 36010S;
150 psig (10.34 bar). 36020S and higher; 1.2 x full scale pressure.
Temperature Limits: 20 to 120°F (-6.67 to 48.9°C); Low temperature
option available.
Process Connections: 1/8˝ female NPT.
Size: 4˝ (101.6 mm) dial face, 5˝ (127 mm) O.D. x 8-1/4˝ (209.55 mm).
Weight: 4 lb (1.81 kg).

SWITCH SPECIFICATIONS
Switch Type:
Each setpoint has 2 Form C relays (DPDT).
Repeatability: ±1% of full scale.
Electrical Rating: 10A @ 28 VDC, 10A @ 120, 240 VAC.
Electrical Connections: Screw terminals.
Power Requirements: 120 VAC, 50/60 Hz; 240 VAC & 24 VAC;
Power optional.
Mounting Orientation: Diaphragm in vertical position. Consult factory
for other position orientations.
Set Point Adjustment: Adjustable knobs on face.

2-1/2 [63.50]

2-1/16 [52.39]

2 [50.80]

1-1/4

[31.75]

(4) 6-32 HOLES

EQUALLY SPACED ON

A 5-1/8 [130.18] B.C.

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]

5/8 [15.88] PANEL

MAX

3/16 [4.76]

3-7/8 [98.43]

5-1/8 [130.18]

6-3/8 [161.93]

(7-5/8 [193.68])

4-3/8 [111.13]

HOUSING REMOVAL

3/4 CONDUIT

CONNECTION

Ø4-3/4

[120.65]

3-7/8 SQ

[98.43]

1/8 FEMALE NPT HIGH

PRESSURE CONNECTION

1/8 FEMALE NPT LOW

PRESSURE CONNECTION

Fig. 1

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