Gauge Indicators

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Gauge Indicators
Gauges

• (Non-Electronic)

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Automotive vehicles use two basic styles
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Two Styles of Gauges

• BIMETALLIC GAUGES
• Thermo-electric
• Slow Movement
• U-Shaped Strip
• Free Arm contains a heater.
• Heat through coil distorts strip
• More Current deflects needle more

• ELECTROMAGNETIC GAUGES
• Four Types
• dArsonval
• Three-coil
• Two-coil
• Air core

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Bimetallic Type
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Balancing Coil Type
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THREE COIL GAUGE
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AIR CORE GAUGE
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d Arsonval Gauge
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Constant Voltage Regulator

• Steady 5 volts
• Why?

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TYPICAL TEMP GAUGE
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FUEL GAUGE SYSTEM
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SENDING UNITS

• THREE TYPES
• THERMISTOR
• High Engine Temp Resistance decreases
• PIEZORESISTIVE
• Sensitive to Pressure Changes
• Is a variable Resistor
• MECHANICAL VARIABLE RESISTOR
• Contains sliding contacts

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PIEZORESISTIVE SENSOR
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MECHANICAL VARIBLE RESISTOR
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OIL PRESSURE WARNING LIGHT SENDING UNIT
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