Velocity TC 3, TC 2, ALT 4, ALT 3, ASI 3, ASX 2, AV 2, E 1, FLIGHT 2, FF 3, GF 2, MAP 2, ROTOR 1, RTC 1, RV 3, TP 2 Operating Manual

Below you will find brief information for thermocouple indicator TC-3, thermocouple indicator TC-2, altimeter ALT-4, altimeter ALT-3, airspeed indicator ASI-3, altimeter & airspeed indicator ASX-2, artificial horizon AV-2, engine monitor E-1, flight instrument FLIGHT-2, fuel computer FF-3. This is a multi-channel thermocouple indicator with a built-in engine leaning facility. It allows you to optimize your fuel mixture according to peak EGT temperatures. The TC-3 can also display a cruise mode facility. This allows you to monitor changing EGT/CHT trends instantly. You can also use the TC-3 for monitoring a variety of other temperatures in your aircraft.

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Velocity TC-3 Operating Manual | Manualzz

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Key features

  • 12 channel thermocouple display
  • supports J, K and E type probes
  • high accuracy: built in thermocouple linearization curves and cold junction compensated
  • engine leaning function according to peak EGT temperatures
  • engine cruise mode to instantly identify changing EGT/CHT trends
  • large backlit graphic LCD with adjustable contrast
  • wide input supply voltage range of 8 to 30V DC with built in voltage reversal and over voltage protection for harsh electrical environments
  • light weight design

Frequently asked questions

The TC-3 supports J, K and E type thermocouple probes.

Temperatures can be displayed in degrees Celsius or degrees Fahrenheit from -100°C to 1200°C (-148°F to 2192°F).

The engine leaning mode allows the pilot to optimize the fuel mixture according to peak EGT temperatures. As the fuel mixture is leaned, so the exhaust gasses get hotter. This rise in temperature is a sign of increased combustion efficiency as the optimum mixture setting is approached. If the leaning progresses past a certain point however, the temperature will begin to drop. This temperature drop is the result of reduced energy output from the diminished fuel flow. The best operating mixture for aircraft engines is in the vicinity of this peak EGT reading. The TC-3 has a special Leaning mode, which easily identifies the peak EGT condition allowing you to adjust your fuel mixture for best performance.

Once in the cruise, pressing the Down/F2 key will immediately enable Cruise Mode. The "CRUISE MODE" label is displayed at the bottom of the main display to clearly differentiate it from the normal operating mode. All EGT and CHT readings are immediately sampled as reference temperatures for the cruise. The display then shows EGT and CHT values relative to this reference temperature. Cruise mode can be cancelled by pressing the Down/F2 key.

Pressing the F1 key will reset the permanent maximum values to the current temperature values.

The alarm output can be used to switch an external alarm indicator. The external alarm switch is an open collector transistor switch to ground with a maximum rating of 0.5A DC. It is possible to wire the alarm contacts of several Stratomaster instruments in parallel should this be desired.
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