These compact devices receive their input signal from various sources depending upon the particular speed switch model and application. Murphy Electronic Speed Switches are available in various configurations to cover a wide variety of applications. Intended for use in general purpose non-classified areas. The TSB is ideal when reading is not desired but temperature is critical to operational efficiency. A glass-filled nylon terminal block with quick-screw terminal connections gives the TSB switch a real advantage in industrial engine applications. Housing is weather sealed to prevent entry of moisture, dust, etc. Trip point is factory preset according to your specifications. The single-pole, double-throw (SPDT) snap-switch is operated directly from the diaphragm, for quick acting and positive switching. A precision machined brass mounting plate and port captures a high quality stamped beryllium copper diaphragm. The construction of this instrument is the same as our time-proven Swichgage. It has one limit contact that can be used to activate an alarm, actuate indicator lights or shut down equipment. The TSB switch is a direct-mount switch for temperature sensing. Steel housing specially coated to resist corrosion.Activates indicator lights, alarms or shuts down equipment.The PSB is ideal when reading is not desired, but pressure is critical to operational efficiency. A glass-filled nylon terminal block with screw terminal connections gives the PSB switch a real advantage in industrial engine applications. The single-pole, double-throw (SPDT) snap-switch is operated directly from the diaphragm for quick acting and positive switching. A precision machined brass mounting plate and port captures a high-quality, stamped beryllium copper diaphragm. The construction of this instrument is the same as Murphy’s time-proven Swichgage instrument. It has one limit contact that can be used to activate an alarm, actuate indicator lights or shutdown equipment. The PSB switch is a direct-mount switch for critical pressure points. Typical Wiring Tech Sheet: Tattletale Annunciators & Magnetic Switches Sales Bulletin: Tattletale Annunciators & Magnetic Switches
Magnetic switches and Tattletale annunciators can make or break circuits for these engines.įor electric motor application, various magnetic switches are available to operate the motor starter, holding coil directly or in conjunction with appropriate Murphy Transformer-Relay assembly. Diesel engines are shut down by either closing off the fuel or air supply.
Some models can also trip fuel valves instead of or in addition to grounding the ignition. For magneto or CD ignitions the magnetic switch grounds the ignition output. Various circuits, time delays and contact configurations are available to match the power source and mode of operation required for alarm only, alarm before shutdown or shutdown only.įor distributor ignition engines, the magnetic switch opens the distributor coil circuit to cause shutdown. Magnetic switches and Tattletale annunciators are available for use with engines or electric motors. Magnetic switches operate basically as a latching relay. Tattletale annunciators indicate which monitored function failed leading to the alarm or shutdown magnetic switches do not. These switches are the electrical load carrying devices for the alarm or shutdown device. Tattletale annunciators and magnetic switches are the nerve centers that translate Swichgage contact operations into decisions and operate the alarm or shutdown device.
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