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Series H2 Dual-Action Explosion-Proof Pressure Switch
Brand: Dwyer Instruments, LLCThe Dwyer Series H2 is designed for sequencing two different actions as pressure of a liquid or gas increases or decreases.
Explosion-proof, UL & CSA Listed for Class I, Groups B, C & D and Class II, Groups E, F & G.
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.
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
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1 - 3 of 3 Part Numbers
Specifications
Brand
Adjustment Type
- Internal Nut
Approvals & Certifications
- CSA
- UL
Conduit Connection
- 3/4” NPT Female
Diaphragm Material
- FEP
Electrical Connectors
- 18 AWG, 18” (460 mm) Long
Electrical Rating
- 5 A at 125/250 Vac
- 5 A Resistive, 3 A Inductive at 30 Vdc
Enclosure, Body Material
- 316 Stainless Steel
Environmental Protection
- IP66
- NEMA 4X
Mounting Position
- Any Orientation
NPT Connection
- 1/4” NPT Female
O-Ring Material
- Buna-N
Set Point - Decreasing
- bar: 0.207 to 68.95
- kPa: 21 to 6,895
- psig: 3 to 1,000
Set Point - Increasing
- bar: 0.345 to 103
- kPa: 34.47 to 10,300
- psig: 5 to 1,500
Switch Type
- Two SPDT Snap Switches
System Pressure
- bar: 103.4
- kPa: 10,342
- psig: 1,500
Temperature Range
- -20° to 135° C (-4° to 275° F) CSA Approved: -20° to 90° C (-4° to 184° F)
- Mechanical HVAC or Process Equipment
- Chemical, Petroleum, Food and Drug Processing Industries
- Process and Industrial Applications