ACR108-Unit 13 Intro to Automations (CRF) - Mr. Graham

A device that senses temperature change and changes some dimension or condition within to control an operating device.

• thermistor

• thermostat

• capillary tube

• pressure switch

Two dissimilar metals fastened together to create a distortion of the assembly with temperature changes.

• thermometer

• ohmmeter

• bimetal

• copper and brass

The rod and tube are each made of a different metal. The tube has a high expansion rate and the rod a low expansion rate.

• The rod will experience stress due to the differential expansion.
• The tube will experience stress due to the rod's expansion.
• Both the rod and tube.

• The rod will expand more than the tube.

An application of the bimetal. Two different metals fastened together in the form of a disc that provides a warping condition when heated. This also provides a snap action that is beneficial in controls that start and stop current flow in electrical circuits.

• snap-disc

• Bimetallic switch or thermostat
• Thermal fuse
• Bimetallic conductor

Using a bulb or sensor, tube, and diaphragm filled with fluid, this device will produce movement at the diaphragm when the fluid is heated or cooled. A bellows may be added to produce more movement. These devices may contain vapor and liquid.

• Humidity sensor
• Flow meter
• Fluid expansion

• Pressure gauge

A thin flexible material (metal, rubber, or plastic) that separates two pressure differences.

• Valve
• Seal
• Gasket
• Diaphragm

An accordion-like device that expands and contracts when internal pressure changes.

• Piston
• Blower
• Fan
• Bellows

A device made of two unlike metals that generates electricity when there is a difference in temperature from one end to the other. Thermocouples have a hot and cold junction.

• Thermal resistor
• Peltier device
• Thermocouple
• Bimetallic strip

A group of thermocouples connected in series to increase voltage output.

• Parallel connection

• Series connection

• Thermocouples

• Thermopiles

A semiconductor electronic device that changes resistance with a change in temperature.

• Resistor
• Capacitor
• Inductor
• Thermistor