Explosion-proof, heavy duty, industrial unit has patented and unique new design which provides sensitivity to differential pressures as low as 10 inches of water (254 mm w.c.), yet handles total pressure of 1500 psi (103 bar). Unlike common differential pressure switches that use a piston-type motion transfer, the Series H3 utilizes a rotary motion transfer shaft that prevents a change in total pressure from causing a setpoint shift. Unit yields deadbands approximately 5% of range, with zero setpoint shift due to variation in working pressures. Friction is minimized and repeatability increased by allowing range spring to act directly on diaphragm plate. Rolling diaphragm design maintains constant effective area to further reduce friction. Diaphragm is allowed to "seat", allowing application of full rated pressure, up to 1500 psi (103 bar), on either high or low pressure port, without damage. Special over-travel feature prevents overtightening of range adjust screw. Choose optional brass chamber for water and water-based fluids or 316 stainless steel for harsher applications.

SPECIFICATIONS
Wetted Materials: See pressure chamber and diaphragm material in model chart on "Ordering" page.
Temperature Limit: -4 to 220°F (-20 to 104°C). ATEX: -4 to 194°F (-20 to 90°C).
Pressure Limit: 1500 psig (103 bar).
Enclosure Rating: See ratings chart below.
Switch Type: SPDT or DPDT snap switch.
Electrical Rating: 5A @ 125/250 VAC, 30 VDC.
Electrical Connections: see model chart on "Ordering" page.
Conduit Connection: 3/4" female NPT.
Process Connection: 1/8" female NPT.
Mounting Orientation: Vertical.
Set Point Adjustment: Internal screw.
Weight: 4 lb 2 oz (2 kg).
Deadband: Approximately 5% of range.
Agency Approvals: UL, CSA, CE and ATEX see ratings chart below.