Dwyer H2 - Manual

Bulletin F-64
Specifications - Installation and Operating Instructions
Series H2 Dual-Action Explosion-Proof Pressure Switches
W.E. ANDERSON DIV., DWYER INSTRUMENTS, INC.
P.O. BOX 358 • MICHIGAN CITY, INDIANA 46361 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: [email protected]
SPECIFICATIONS
Wetted Materials: See model chart on next page.
Temperature Limit: 275°F (135°C). CSA approved -20 to 90°C (-4 to
184°F).
Pressure Limit: 1500 psig (103 bar).
Enclosure Rating: UL listed explosion-proof, Class I, Groups B, C, and
D. Class II Groups E, F, and G. Meets NEMA 4X (IP65). CSA optional.
Class I, Groups B, C & D. Class II, Groups E, F, & G -20°C ≤ Tamb ≤
75°C T6 [optional -20°C ≤ Tamb ≤ 40°C T5] Type 4.
Switch Type: One or two SPDT snap switches.
Electrical Rating: 5A @ 125/250 VAC. 5A res., 3A ind. @ 30 VDC.
MV option: 1A @ 125 VAC, 1A res. or .5A ind. @ 30 VDC. Optional
10A switch-consult factory.
Electrical Connections: 18 AWG, 18˝ (460 mm) long.
Conduit Connection: 3/4˝ female NPT.
Process Connection: 1/4˝ female NPT.
Mounting Orientation: Any position.
Set Point Adjustment: Internal nut.
Weight: 2 lb (0.9 kg).
Deadband: Approximately 10% of range.
5
[127.00]
3-3/8
[85.73]
Ø2-5/8
[66.68]
2-15/16
[74.63]
3/4 NPT ELECTRICAL
CONNECTION
1/4 NPT PRESSURE CONNECTION
Accurate, dependable long-lived operation results from the built-in
quality of Duotect
® pressure switches. They are designed for sequencing
work where two different actions are to be triggered, as pressure of a
liquid or gas increases or decreases. This permits control and protection
of many types of equipment and systems subject to pressure variations.
The patented design consists of two pistons in a concentric arrangement,
operated by a single diaphragm with one pressure chamber. Each piston
actuates a separate switch independent of the other. The switches may
be adjusted to operate together, or at opposite ends of the range, or at
any two intermediate setpoints. They can be easily field adjusted. For
quick maintenance, the threaded top is removed to adjust or service
switches without disturbing electrical or pressure connections. The
controls are UL and CSA Listed as Explosion Proof, Class I, Groups B,
C, D. Class II groups E, F & G, and weatherproof NEMA-4.
Expanded Listings. Consult factory for models that are UL Listed (not
CSA) Explosion-proof Class I, Groups A, B, C, & D; Class II, Groups E,
F, & G; Weatherproof, NEMA-4X. Contacts rated 10 amp @ 125/250
VAC, 5 amps @ 30 VDC.
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