Differential Pressure for Filter Restrictions

The 20DP and A20DP Series (2 inch/51 mm dial) and the 25DP and A25DP Series (2-1/2 inch/64 mm dial) Swichgage instruments are diaphragm-actuated, differential pressure-indicating gages, with a built-in electrical switch.


Overview

Monitors Engine Oil and Fuel Filters

The 20DP and A20DP Series (2 inch/51 mm dial) and the 25DP and A25DP Series (2-1/2 inch/64 mm dial) Swichgage instruments are diaphragm-actuated, differential pressure-indicating gages, with a built-in electrical switch. This switch is used for tripping alarms and/or shutting down equipment. These gages are intended to monitor and indicate oil, fuel or water filter restriction and can reduce the risk of dangerously high pressure which may rupture the filter, result- ing in contaminants entering the system.

The 20DP and 25DP series mechanism is enclosed in a steel case coated to resist corrosion.
The A20DP and A25DP series have a polycarbonate case and are sealed from the environment. All feature a polycarbonate, break-resistant lens and a polished, stainless steel bezel to help protect these rugged, built-to-last instruments.
The gage pointer acts as a pressure indicator and as one switch pole which completes a circuit when it touches the adjustable limit contact. Contacts have self-cleaning motion to ensure electrical continuity.

Features

  • CONSTANT VISUAL INDICATION of the condition of your filter is shown on the dial.TWO INSTRUMENTS IN ONE – an accurate indicating gage and adjustable p.s.i.d. limit switch. Reduces inventory and installation time.

  • ADJUSTABLE CONTACT lets you set the monitoring range of the gage. The contact is tamperproof and can be set only with a 1/16 Allen-head wrench.

  • DURABILITY – All gages are made of durable materials allowing them to withstand rugged applications.

  • EARLY FILTER CHANGES cost you money and increase the risk of contaminants entering the sys- tem. A Murphy filter restriction Swichgage instru- ment will let you know when to change the filter and maintain peak efficiency.

  • The gage pointer makes with an adjustable contact to complete a pilot-duty circuit.