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Temperature Sensors & Relays

Heat is the quiet enemy of amplifiers and batteries, and temperature sensors let you watch it from the driver's seat. Sparked Innovations offers 12V ambient thermometers rated from -30°F to 120°F and thermometers rated from -34°F to 200°F with the sensor on an 18 foot cable for remote mounting.

Display colors include white, red, purple, green and blue to match other Sparked gauges.

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Ambient or Remote Sensor

The ambient thermometer reads the air around the display, a simple way to track cabin or trunk temperature on hot days. The 18 foot cable version places the sensor away from the display and covers a wider range, up to 200°F, so you can run it to an amp rack, a battery box or another spot you cannot see from the seat.

Where to place the sensor

  • Amplifier rack: mount it near, not touching, the hottest amplifier to see when airflow is falling behind.
  • Battery area: batteries in enclosed spaces can run warm under heavy charging, and a reading helps you spot it early.
  • Trunk or cargo area: track how hot a closed trunk gets during long listening sessions.

Using Temperature Sensors With Fans and Relays

Temperature sensors tell you when a problem is building, and the usual response is moving air. Pair a reading with a fan from Amplifier Cooling Fans, and use a relay whenever a switch has to control a fan bank or other high-current load, so the switch carries only a small trigger current. Latching LED buttons from Switches & Panels make tidy fan controls.

When readings climb, check that amplifiers have breathing room and that gains are not pushing them into clipping, since distorted output adds heat. Give every sensor an inline fuse on its 12V feed.

Building a Monitoring Dash

Many builders mount a thermometer beside a voltmeter so heat and voltage are visible together, and matching display colors keep the dash consistent. If temperatures stay high even with good airflow, the amplifier may be working too hard for its load; compare its rating with your speakers or subs and consider stepping up through our amplifiers. More monitoring parts are in Accessories.