Difference of PZT and PT Transmitters

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

In a manual from which someone removed the glossary?

Very good. Take a Team Point.

Normally

PZT stands for Piezoelectric Transducer

whereas

PT stands for Pressure Transmitter

As PWSLACK says we need a little more context.

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

Use a search engine. "SE"

Are you in charge of Marketing?

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

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

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.

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.