Deck 13: Pressure Switches and Sensors

Question 1

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

Answer 1

diaphragm-operated

Question 2

What is differential pressure?

Answer 2

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

Question 3

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

Answer 3

False

Question 4

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

Question 5

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

Question 6

Why are piezoresistive sensors very popular?

Question 7

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 ____________________.

Question 8

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

Question 9

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

Question 10

Contacts can be permitted to slowly close or open.

Question 11

Figure 13-5


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

Question 12

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.

Question 13

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.

Question 14

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

Question 15

What does the term ratiometric mean?