| 2900 Church Street Norfolk, VA 23504 Phone (757)627-5187 Fax (757)627-0134 (800)695-1474 |
| "Quality Service Since 1938" |
| We will beat any competitor's price on gauges ! |
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| We are a full line distributor for Stewart Warner, Hobbs, VDO, Murphy, Datcon, and AC gauges. |
| We carry a complete line of switch gauges, alarm switches, engine shut down controls, Hobbs industrial lamps, pulse generators, mag pick-ups, gauges and sending units for oil pressure, water temperature, fuel controls, ammeters, and volt meters. |
| Murphy Industrial and Marine Gauges |
| Whether you are in power generation, agriculture, construction or any other industrial market, Murphy has the right solutions for maximum engine protection, monitoring and control. Murphy industrial products are designed to help our customers manage the new technology required to meet ever changing environmental emissions regulations for diesel and spark ignited engines. Murphy also continues to provide traditional products like gauges, switches, switch gauges, controllers and panels for use on mechanically fueled engines. From off-highway, agricultural and industrial stationary, to power generation and marine, Murphy delivers user friendly devises that provide the best value solutions for our customers |
| Technical Information |
| Voltmeter vs. Ammeter - Which is Right For You? A voltmeter measures electrical potential (pressure) in units called volts that is necessary for current measured in amps (a quantity) to flow through your electrical system. If there is NO pressure (volts), there can be NO current flow (amps). This is analogous to having no oil pressure and, therefore, no oil flow. You must have one to get the other! Ammeters were popular when generators and alternators typically averaged 35-40 amps of output, and vehicle electrical systems were much less complex. Today, alternators commonly have output capacities of 100-110 amps with more complex wiring and higher accessory loads. This makes it more difficult to install an ammeter. Just as we measure oil pressure rather than oil flow, we prefer to measure volts rather than amps, so, the overwhelming choice for performance applications today is the voltmeter. In fact, ammeters are not available as a Stewart Warner Performance product, but they are available in our regular Stewart Warner line should you need one. |
How do electric gauges work?
At the heart of every Stewart Warner Electrical Gauge is our high-performance,
patented air-core movement - the gauge's motor.
Looking inside the motor reveals two coils ("A" & "B") comprised of copper wire
wrapped around the front bobbin, and a rear bobbin assembly that contains a
magnetized armature assembly (magnet & shaft), surrounded by dampening fluid
which acts to minimize pointer flutter and ensure smooth response.
The bobbin assembly is packaged in a metal isolation can that supports the gauge's dial (and light pipe where
appropriate), and the can is mounted inside a housing (case).The armature assembly freely rotates within
the coils, aligning with the varying magnetic fields produced by the amount of current flowing through the
coils. (Current variance is triggered by signals provided by the sender.)
The pointer - attached to the shaft on the armature assembly - once calibrated, will provide a directional
indication regarding the amount of pressure, temperature, appropriate level of fuel or voltage being
measured.
Senders that drive Stewart Warner Performance Electric Gauges are based on variable resistance
technology. The three basic variable resistance senders are temperature, pressure and fuel level.
Each sender possesses a different rate of resistance change or "MATCH", for the specific gauge's
electrical design. The sender's resistance change results in current changes within the sender-gauge circuit.
These changes cause an increase or decrease in the gauge's magnetic field. The variance is the magnetic
field causes pointer movement.
At the heart of every Stewart Warner Electrical Gauge is our high-performance,
patented air-core movement - the gauge's motor.
Looking inside the motor reveals two coils ("A" & "B") comprised of copper wire
wrapped around the front bobbin, and a rear bobbin assembly that contains a
magnetized armature assembly (magnet & shaft), surrounded by dampening fluid
which acts to minimize pointer flutter and ensure smooth response.
The bobbin assembly is packaged in a metal isolation can that supports the gauge's dial (and light pipe where
appropriate), and the can is mounted inside a housing (case).The armature assembly freely rotates within
the coils, aligning with the varying magnetic fields produced by the amount of current flowing through the
coils. (Current variance is triggered by signals provided by the sender.)
The pointer - attached to the shaft on the armature assembly - once calibrated, will provide a directional
indication regarding the amount of pressure, temperature, appropriate level of fuel or voltage being
measured.
Senders that drive Stewart Warner Performance Electric Gauges are based on variable resistance
technology. The three basic variable resistance senders are temperature, pressure and fuel level.
Each sender possesses a different rate of resistance change or "MATCH", for the specific gauge's
electrical design. The sender's resistance change results in current changes within the sender-gauge circuit.
These changes cause an increase or decrease in the gauge's magnetic field. The variance is the magnetic
field causes pointer movement.
How do mechanical gauges work?
Stewart Warner Performance Mechanical Gauges include integral "Bourdon" tubes
which have one free-floating end that is linked to a gear and shaft assembly, with
pressure pulsation and vibration dampening to reduce pointer fluctuation.
The Bourdon tube can be fine-tuned by varying its strength and stiffness. It works
by being deflected (moved) by the pressure of the liquid/gas that is being measured,
and it then moves the gear and shaft assembly which, in turn, moves the pointer to
produce an accurate level-reading on your dial.
Mechanical pressure gauges have a port on the back to make a direct connection, whether through hose or
tubing, with the fluid or gas being measured.
Mechanical temperature gauges have a sealed capillary tube and bulb assembly, which is filled with
temperature sensitive liquid. This liquid produces a proportional vapor pressure when it is exposed to
temperature variation. The vapor pressure is the acting force on the Bourdon tube and is calibrated to
provide accurate pointer movement in relation to the temperature.
Stewart Warner Performance Mechanical Gauges include integral "Bourdon" tubes
which have one free-floating end that is linked to a gear and shaft assembly, with
pressure pulsation and vibration dampening to reduce pointer fluctuation.
The Bourdon tube can be fine-tuned by varying its strength and stiffness. It works
by being deflected (moved) by the pressure of the liquid/gas that is being measured,
and it then moves the gear and shaft assembly which, in turn, moves the pointer to
produce an accurate level-reading on your dial.
Mechanical pressure gauges have a port on the back to make a direct connection, whether through hose or
tubing, with the fluid or gas being measured.
Mechanical temperature gauges have a sealed capillary tube and bulb assembly, which is filled with
temperature sensitive liquid. This liquid produces a proportional vapor pressure when it is exposed to
temperature variation. The vapor pressure is the acting force on the Bourdon tube and is calibrated to
provide accurate pointer movement in relation to the temperature.
| Come to us for all of your industrial, marine, automotive, and military requirements. We have been serving the Norfolk, Virginia area for over 70 years featuring products from Stewart Warner, Leece Neville, Motorola, Prestolite, Murphy, VDO, Delco Remy, Hobbs, Briggs & Stratton, Kohler, Lestek, Powerline, Balmar, Niehoff, Hitachi, Nippondenso, Mitsubishi, Tecumseh, Bosch, Mando, and many others. We have been servicing and repairing cable driven speedometers, tachometers, cables (speedometer, tachometer, and synchronizer), angle drives, and ratio adaptors for over 45 years. Our shop has the ability to rebuild practically any alternator, starter, generator, magneto, or DC motor. Our sales staff can supply all of your gauge requirements - from mechanical to electric - pressure to temperature - for oil, fuel, or water - senders, switches, shutdown alarms, and magnetic pick ups. "Any order, large or small, we'll work hard to earn your business" |
| As Of September 1st 2008 We Are Now A VDO Master Distributor & Welcome Any Dealer Inquiries. We'll Offer Competitive Pricing & Superior Customer Service As We Have For Over 70 Years. |