Instruction Booklet: 2025P-INS
Effective: 10-15-83
123456789 Revision: 9-28-84
INSTRUCTIONS FOR INSTALLATION & MAINTENANCE
OF PRESSURE & VACUUM SWICHGAGES®
SERIES: 20-P, 25-P, A20-P, A25-P
INCLUDING V, VWC, ABS, EO, DP MODELS
TYPICAL PRESSURE SWICHGAGE®
A SWICHGAGEâ is an indicating gauge, having adjustable limit
contacts that act as switches when closed with the gauge's
pointer/contact. SWICHGAGESâ are available in various sizes
and shapes to adapt to most applications, for temperature,
pressure, liquid level, vibration, or speed. These are dry contact
type switches for light duty electrical switching and should be
used with a Murphy Magnetic Switch or Transformer Relay.
Both electrical and mechanical experience is necessary for
proper installation and maintenance.
TYPICAL TATTLETALE MAGNETIC SWITCH"
TATTLETALE Magnetic Switches
Murphy manufactures several, patented magnetic switches for
protection of the light duty SWICHGAGE contacts and to ensure
positive shut-down of equipment. There are magnetic switches
for Capacitor Discharge ignition, Magneto, or battery systems,
and models for electric motor driven equipment. TATTLETALES
are pop-out indicators that show the cause of shut-down. If
several TATTLETALES are used in conjunction on with several
different SWICHGAGE, the first one out will lockout all other
magnetic switches. Be sure the type of Magnetic Switch matches
the power source used to trip it.
·
Note: At equipment start-up, the magnetic
switch reset button must be held In until no-
mal
operation
occurs,
unless
closed
SWICHGAGESÒ are locked out by time delay or
lockout button. (Not applicable for Mag. or
C.D. power)
SEE BULLETIN M-6797 FOR MURPHY TATTLETALES & MAGNETIC SWITCHES
