Dwyer Instruments SERIES H2 Catalog Page

[127.00]

3-3/8

Ø2-5/8

1/4 NPT PRESSURE CONNECTION

SERIES H2 | W. E. ANDERSON™ BY DWYER

DUAL-ACTION EXPLOSION-PROOF PRESSURE SWITCH

Explosion-proof and Weatherproof Enclosure

PRESSURE

[66.68]

[85.73]

3/4 NPT ELECTRICAL CONNECTION

2-15/16

[74.63]

Explosion-Proof, UL & CSA Listed for Class I, Groups B, C & D and Class II, Groups E, F & G. The Series H2 Dual-Action Explosion-Proof Pressure Switch is designed for sequencing two different actions as pressure of a liquid or gas increases or decreases. The design consists of two concentric pistons 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, at opposite ends of the range or

at two intermediate set points. The threaded top is removed to eld adjust or service

switches without disturbing electrical or pressure connections. The Duotect® switch is explosion-proof and weatherproof. It can be mounted in any position and is not affected by vibration.

FEATURES/BENEFITS

• Explosion-proof and weather-proof housing provides device protection for outdoor use or harsh environment operation

• UL listed, CSA approved to support rigorous process applications and regulations

• Independent piston action design for either gas or liquid allows switches to active together or independently based on settings

• Mounting in any position and not affected by vibration provides reliable switching for equipment

APPLICATIONS

• Mechanical HVAC or process equipment

• Chemical, petroleum, food and drug processing industries

• Process and Industrial applications

SPECIFICATIONS Wetted Materials: 316 SS chamber

with FEP diaphragm and Buna-N O-ring standard. Fluoroelastomer or EPDM O-ring optional. 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 (IP66). 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.

MODEL CHART Model Low Range psig (bar) High Range psig (bar) H2S-1

3 to 40 (0.21 to 2.76)

H2S-2

25 to 250 (1.72 to 17.2)

H2S-3

100 to 1000 (6.89 to 68.9)

Switch Type: Two SPDT snap switches. Electrical Rating: 5 A @ 125/250

VAC. 5 A res., 3 A ind. @ 30 VDC. Gold contacts optional.

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 (.9 kg). Deadband: Approximately 10% of range. Agency Approvals: CSA, UL.

5 to 75 (0.35 to 5.17) 30 to 400 (2.07 to 27.6) 150 to 1500 (10.3 to 103)