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Anonymous Poster #1

Difference of PZT and PT Transmitters

08/20/2013 2:30 AM

i came across the PZT and PT instruments,please explain the difference of these two instruments

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#1

Re: Difference of PZT and PT transmitters

08/20/2013 3:03 AM

Please explain the context in which these two different transmitters were found.

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#2
In reply to #1

Re: Difference of PZT and PT transmitters

08/20/2013 3:34 AM

In a manual from which someone removed the glossary?

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#3
In reply to #2

Re: Difference of PZT and PT transmitters

08/20/2013 4:10 AM

Very good. Take a Team Point.

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#4

Re: Difference of PZT and PT transmitters

08/20/2013 4:21 AM

Normally

PZT stands for Piezoelectric Transducer

whereas

PT stands for Pressure Transmitter

As PWSLACK says we need a little more context.

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#5

Re: Difference of PZT and PT transmitters

08/20/2013 5:11 AM

One has a "z" in it, one does not.

Use a search engine. "SE"

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#6

Re: Difference of PZT and PT transmitters

08/20/2013 6:42 AM

Are you in charge of Marketing?

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#7

Re: Difference of PZT and PT Transmitters

08/21/2013 2:09 AM

For my experiences,PT is used for PCS (process control system) and PZT is used for SDS(Shutdown system) function.am i correct?

Rgs,

khoi

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#8
In reply to #7

Re: Difference of PZT and PT Transmitters

08/21/2013 3:28 AM

With the current level of input from the Original Poster, it is not possible to tell.

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Anonymous Poster #1
#9
In reply to #7

Re: Difference of PZT and PT Transmitters

08/21/2013 8:21 AM

Hai Khoi

Thanks for your reply

Yes you are Correct ,in my current project PT was wireless type connected to PCS and PZT was hardwired to ESD system.

Please advice me why not PT was hardwired and PZT was wireless,is there any merits or demerits in selecting the instruments type.

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#11
In reply to #9

Re: Difference of PZT and PT Transmitters

08/31/2021 7:10 AM

Whatever the details of type of PT or PZT, a "wireless" radio, optic, or acoustic coupling would be less reliable than a direct wire [maybe pneumatic] connection.

For an ESD system greater reliability would be mandatory.

There is also the desirability of different technology for ESD or back-up equipment/cross-checks.

For example, a 4-20 mA pressure transducer might be used for control with a direct wired steel diaphragm "microswitch" pressure switch for emergency shutdown ESD.

As another, a triplicated, voting shutdown system with radio connection could have all its 3 elements disabled by strong radio interference from an electrical fault.

I believe some airliners have crashed because all three of the airspeed transducers used identical pitot tubes [with inadequate heaters for conditions] which all blocked with ice simultaneously, giving equal, but high readings. Backup "truth" checks, engine speed versus altitude comes to mind, were not automatically alarmed or understood by crew leading to low airspeed and fatal stall.

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#10

Re: Difference of PZT and PT Transmitters

08/28/2021 9:28 PM

PT - Pressure Transmitter

PZT - Pressure Transmitter(Safety, ESD, PSD)

ESD - Emergency Shut Down

PSD - Process Shut Down

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