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Pressure Switch

01/17/2017 10:33 PM

Hello,

Recently i am doing with the data sheet of pressure switch,But some terms are not clear to me as "1.On measurement Increase Switch, 2.Dead band Pressure Range,3.Differential Pressure Range" I am looking forward to experts for the explanation of those terms with examples.

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#1

Re: Pressure switch

01/17/2017 10:43 PM

Hello Mahmud,

Can you post a link to the data sheet here? If a paper data sheet, can you tell us the manufacturer and part number?

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#5
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Re: Pressure switch

01/19/2017 5:38 AM

good beard!

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#6
In reply to #1

Re: Pressure switch

01/19/2017 2:29 PM

That Ned Kelly was quite the Outlaw down Under.

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#2

Re: Pressure switch

01/17/2017 10:58 PM

I will illustrate this with a common example: a pressure switch that starts a fan on rise of refrigerant condensing pressure, and then shuts the fan back off when the pressure falls. For example, as the pressure rises above 9 bar, the fan starts; then, when the pressure drops below 7 bar, the fan stops.

In your terms, the "on measurement increase" value is 9 bar, the "on measurement decrease" value is 7 bar, and the "deadband" is the difference, namely 2 bar.

For close control of the measured variable, a small deadband is desirable; to avoid too-frequent starting/stopping of motors, a larger deadband is desirable. This is a matter of compromise and experience according to the application.

"Deadband pressure range" would apply if the deadband is adjustable. In the given example, the deadband was 2 bar, but it might be from a fraction to a few bar. (Or whatever units you may be using.)

Some other terms you might see are "cut-in point" and "cut-out point."

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#3

Re: Pressure switch

01/17/2017 11:01 PM
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#4

Re: Pressure Switch

01/18/2017 2:14 PM

Pressure switches come in about as many formats as Democrazies.

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