H2 Dual-Action Explosion-proof Pressure Switches

Explosion proof and weatherproof housing, independant piston action design, mountable in any position

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

• 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

Wetted Materials 316 SS chamber with FEP diaphragm and Buna-N O-ring standard. Fluoroelastomer or EPDM O-ring optional
Temperature Limit 275F (135C).
CSA approved: -20C - 90C (-4F - 184F)
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 -20C ≤ Tamb ≤ 75C T6 [optional -20C ≤ Tamb ≤ 40C 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 in (460 mm) long
Conduit Connection 3/4 in female NPT
Process Connection 1/4 in 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

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