H2

Dwyer Series H2 Dual-Action Explosion-proof Pressure Switch

$ 736.00

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Product Description

Explosion-proof and Weatherproof Housing

Explosion-proof, UL & CSA Listed for Class I, Groups B, C & D and Class II, Groups E, F & G. The H2 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 field 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.

Product Applications

  • Mechanical HVAC or process equipment
  • Chemical, petroleum, food and drug processing industries
  • Process and Industrial applications

Models

Model Description
H2S-1 Duotect® dual-action explosion-proof pressure switch, 3-40 psig (0.21-2.76 bar) low range, 5-75 psig (0.35-5.17 bar) high range
H2S-2 Duotect® dual-action explosion-proof pressure switch, 25-250 psig (1.72-17.2 bar) low range, 30-400 psig (2.07-27.6 bar) high range
H2S-3 Duotect® dual-action explosion-proof pressure switch, 100-1000 psig (6.89-68.9 bar) low range, 150-1500 psig (10.3-103 bar) high range

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.
Switch Type:
Two SPDT snap switches.
Electrical Rating:
5 A @ 125/250 VAC, 5 A res., 3 A ind. @ 30 VDC. Gold contacts or 10 A switch 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.

Features

  • Explosion-proof and weatherproof 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

Literature

Manuals

H2 Duotect®

Catalog Pages

Series H2 Catalog Page

Approvals

Drawings

Model Chart

EXAMPLE H2 S 1 CSA Series H2S-1-CSA Dual-Action Explosion-Proof Pressure Switch, stainless steel housing, low range 3-40 psi, high range 5-75 psi, with CSA approval.
SERIES H2       Dual-Action Explosion-Proof Pressure Switch
HOUSING   S     Stainless Steel
RANGE     1
1S
2
2S
3
3S		   Low Range 3-40 psi, High Range 5-75 psi
3-75 psi
Low Range 25-250 psi, High Range 30-400 psi
25-400 psi
Low Range 100-1000 psi, High Range 150-1500 psi
100-1500 psi
OPTIONS       CSA
MV
PRESET
ST
EPDM		 CSA Approval
Gold Contact Switch
Preset
Stainless Steel Tag
Ethylene Propylene O-rings

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