End Devices
The 20 Series (2 inch/51 mm dial) and the 25 Series (2 1/2 inch/64 mm dial) Swichgage instruments are diaphragm-actuated, vacuum-indicating gages with built-in electrical switches. These switches are used for tripping alarms and/or shutdown devices.
The 2 and 2-1/2 in. (51 and 64 mm) dial size Murphygage and Swichgage instruments are diaphragm-actuated, vacuum gages with a 1/8-27 NPTM pressure port connection (2 pressure ports for differential pressure models). Models with face-adjustable contact(s) are rated for 2A @ 30V (pilot duty). If the gage case is steel (20V, 25V), the ground path for the contact circuit is through the case.
Sales Bulletin: 20V/25V/A20V/A25V Series
96023 rev. 2014/10/04
Installation Instructions - Pressure & Vacuum Dial Instruments
00-02-0162 rev. 2016/07/26
The VWC Series Swichgage instruments are direct reading gages for use with dry air filters. As the filter deteriorates, air inflow will decrease creating increased vacuum between the air filter and the carburetor. The vacuum is monitored by the Swichgage which gives a visual readout of the filter condition. A built-in adjustable limit contact can operate an alarm to alert the operator when it is time to service or replace the air filter element. Murphygage indicating-only models are also available.
20VWC and 25VWC models feature a steel case and are available with dial illumination. The A25VWC model has a glass filled polycarbonate case. Standard models have a range of 0 to 30 in. (0-76 cm) of water restriction. Optional 0-50 in. (0-1.27 m) range is available. Please consult your engine operators manual for the recommended restriction limit for dry air filter servicing.
The VWC Series Swichgage instruments can be used on any type of dry air filters for Gasoline or diesel engines. They are particularly useful for engines operated in dusty environments such as agricultural and construction equipment, industrial engines and mobile equipment. Unlike traditional pop-up or latch-up type indicators, the VWC Series gives constant readout in meaningful terms of the changing condition of your filter.
Sales Bulletin: Air Filter Restriction Swichgage
VWC-7540B (00-02-0038) rev. 1999/07
Installation Instructions - Pressure & Vacuum Dial Instruments
00-02-0162 rev. 2016/07/26
