Dywer DX differential pressure switch

The series DX differential pressure switch can be used for low differential pressure indication with setpoint on a decrease of pressure as low as 1 psid (0.07 bar). Differential setpoint ranges are available from 2.5 to 75 psid (0.17 to 5.17 bar) on increasing differential pressure and 1.0 to 67 psid (0.07 to 4.62 bar) on decreasing differential pressure. The unit features a high static pressure rating of 200 psig (13.8 bar) for higher static pressure applications. It comes standard with a weatherproof, UL type 4X enclosure for dust-laden, outdoor or washdown installation environments.

Incorporating an externally adjustable setpoint, the series has integral mounting flange and a removable electrical terminal block for quick and easy installation. It uses opposing diaphragms to sense the high and low pressure with a pivot mechanism that transfers the difference of the two pressures to the SPDT switch.

The series is suitable many applications, including: indicating filter differential pressure, eg, initiating water filter backwash as the filter becomes clogged on increasing differential pressure; proof-of-flow indicator monitoring differential pressure from a sensing device, eg, sensing the pressure across an orifice plate to prove water flow; proving flow through a pump by sensing the pressure across the pump to make sure the pump does not run dry; proving flow through a chiller - often called evaporator water pressure drop; and proving flow through a heat pump or AC unit - often called a condenser water lock-out switch.