Deck 13: Pressure Switches and Sensors

Question 1

What is differential pressure?

Answer 1

Differential pressure is the difference in pressure between cut-in or turn-on pressure and the cut-out or turn-off pressure.

Question 2

In order for the control circuit to perform its desired function, the pressure switch must contain six different contacts, three normally closed and three normally open.

Answer 2

False

Question 3

Figure 13-15
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In the accompanying figure, when pressure is applied to the diaphragm, the resistance of ____________________ changes proportionally to the applied pressure.

Answer 3

piezoresistors

Question 4

Regardless of the method used to sense pressure, all pressure switches activate a set of ____________________.

Question 5

The pressure switch contains both normally open and normally closed contacts.

Question 6

Why are piezoresistive sensors very popular?

Question 7

Contacts can be permitted to slowly close or open.

Question 8

Why is the metal bellows type switch not as sensitive as the diaphragm type?

Question 9

The force sensor is unable to use silicon piezoresistive elements to determine the amount of pressure to the sensing element.

Question 10

A diaphragm switch can be used to sense a much higher pressure than a metal bellows type switch.

Question 11

Figure 13-5

In the accompanying figure, why must air space be maintained in the tank?

Question 12

____________________ are designed to produce an output voltage or current that is dependent on the amount of pressure being sensed.

Question 13

What does the term ratiometric mean?

Question 14

A(n) ____________________ switch can sense small pressure changes at low pressure.

Question 15

Figure 13-16
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In the accompanying figure, the sensor contains an internal operations amplifier and can provide output voltage proportional to the ____________________.