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46 Cards in this Set
- Front
- Back
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Type of pressure switch used to measure small changes in low pressure systems? |
Diaphragm |
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A pressure switch is set to cut in at 375 psi and cut out at 450. What is the pressure differential for this switch? |
75psi |
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Front (Term) |
Relay Coil installed |
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What is a piezoresistor |
A pressure sensor that is small, reliable, and accurate. Very popular |
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Sequence of operations required to pump sumps |
Normally open float switch |
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The sequence of operations required to fill tanks |
Normally closed float switch |
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Wh |
Back (Definition) |
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What type of float switch does not have a differential setting?advantage of the bubble |
Mercury Bulb Float Switch |
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Advantage of the bubble type system for sensing liquid level. Typ |
The pressure switches are on the outside for easy service. |
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Typical uses of flow switches |
Air conditioning and refrigeration |
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Draw |
Back (Definition) |
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Draw a one line diagram showing a bell that rings in the absence of flow. Include a switch to turn off the bell manually. |
Back (Definition) |
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What is a transducer? |
A device that converts one form of energy into another. |
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Most common output current for flow sensors. |
4 to 20 milliamperes |
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Faraday’s Law concerning conducts moving through a magnetic field? |
Conductor moves through a magnetic field a voltage is induced into a conductor |
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What type of flow sensors use Faraday’s law? |
Electromagnetic flow sensors. Waters the conductor |
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The operating principal of the solid-state airflow sensor |
Air or gas flowing across a surface causes heat transfer |
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Should a metal bar be heated or cooled to make it expand? |
Heated |
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Type of metal that remains liquid at room temperature how is a numeral strip |
Mercury |
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How is a bi-metal strip made? |
By bonding two dissimilar types of metal together |
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Why are bi-metal strips often formed into a spiral shape? |
It allows a longer bimetal strip to be used in a small space. |
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Why should electrical contacts never be permitted to open or close slowly? |
Could cause an arch Or ruin the contacts |
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What two factors determine the amount of voltage produced by a thermocouple? Test question!!! |
The type of metal used to make it. The temperature difference of the 2 junctions. |
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What is a thermopile? |
An electric device that converts thermal energy into electrical energy |
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What type of chemical is used to cause a pressure change in a bellows type thermostat? |
Any kind of refrigerant. |
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Ohms law |
Voltage (pressure) pushes amps (current) through a resistance. |
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Define Voltage |
Potential energy / electrical pressure. |
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Define Amps |
Is the flow or current of electrons through a circuit. |
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Define resistance |
Is the opposition that a substance offers to the flow of electric current. |
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U m K M ? |
6 3 3 6 |
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Edit |
Edit |
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Type of pressure switch small changes in low-pressure system |
Diaphragm |
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Transducer |
Converts one type of energy into another. Physical to values |
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Electro magnetic flow sensor |
Uses faradays law for operation. |
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Solid state air sensor principles |
Air or gas flow across a surface and cause heat. |
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Pressure switch for high psi 1500-1800psipressure switch |
Metal bellos |
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Pressure switch that controls many contacts |
Control relay |
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Piezoresister |
Pressure sensor, small reliable and accurate. Very popular |
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Float switch with no differential setting. |
Mercury bulb float switch No differentials |
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Bubbler system |
Pressure switch used to sense liquid levels. Uses pressure sensors not floats |
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Differential pressure |
Difference in pressure between cut-out and in |
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Vortex Flow Sensors |
Use a shedder bar in the line to produce a swirling current or vortex. |
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Colorimetric flow sensor |
Can sense the flow of air, water, oil, or any other medium that is thermally conductive |
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Uses of air flow switches |
Air-conditioning and refrigeration. |
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Piezoresistive sensors create produce voltage or current that is dependant on what? |
The amount of pressure being sensed |
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Piezoresistors come on ranges from? |
0 to 1 psi 0 to 30 psi |
