6 replies to this topic

[Estiqaatsi]

I recently came across the use of the codes “LIT”, “PIT”, “TIT”, inside the typical symbol of “instrument mounted locally” (simple circle). I had never seen it before. Is it a mistake?

 

If, for example, I normally indicate "PT" is the "I" implied? In this case "PIT" would be redundant but not wrong.

 

Also I came across some "PIC" mounted locally. Is it possible? Maybe it is some old type local controller, but I wonder how much space it can find in modern industry.

Edited by Estiqaatsi, 09 November 2021 - 04:04 AM.

[breizh]

Hi,

Consider the doc attached :
https://www.bing.com...st=0&ajaxserp=0

 

hope this is helping you.

Breizh

[Estiqaatsi]

Hi,

Consider the doc attached :
https://www.bing.com...st=0&ajaxserp=0

 

hope this is helping you.

Breizh

 

Thank you Breizh.

 

So LIT, PIT, TIT etc exist, although apparently they are quite rare.

Instead regarding locally mounted controllers, I'm trying to figure out under what circumstances they might be useful.

 

I found this on the net for example:

https://web-material...M04B01-00EN.pdf

[jayari]

I normally see PI, PIT, and PT (same with level and temperature) differentiated on drawings. I've worked with specialty chemical systems that are built into purged enclosures where the location for the instrument is very small or blocked from line of sight, so only a transmitter is used and the reading is available on the HMI that's readily accessible. These systems normally came with analog gauges at external utility connections.

[Chemitofreak]

I recently came across the use of the codes “LIT”, “PIT”, “TIT”, inside the typical symbol of “instrument mounted locally” (simple circle). I had never seen it before. Is it a mistake?

 

If, for example, I normally indicate "PT" is the "I" implied? In this case "PIT" would be redundant but not wrong.

 

Also I came across some "PIC" mounted locally. Is it possible? Maybe it is some old type local controller, but I wonder how much space it can find in modern industry.

 

PIT, LIT and TIT are nothing but Pressure Indicating Transmitter, Level Indicating Transmitter and Temperature Indicating Transmitter i.e. you will have a local reading of the parameter available on the field.

 

PT, LT and TT are Pressure Transmitter, Level Transmitter and Temperature Transmitter i.e. you will not have a local reading of the parameter available on the field.

[Estiqaatsi]

 

I recently came across the use of the codes “LIT”, “PIT”, “TIT”, inside the typical symbol of “instrument mounted locally” (simple circle). I had never seen it before. Is it a mistake?

 

If, for example, I normally indicate "PT" is the "I" implied? In this case "PIT" would be redundant but not wrong.

 

Also I came across some "PIC" mounted locally. Is it possible? Maybe it is some old type local controller, but I wonder how much space it can find in modern industry.

 

PIT, LIT and TIT are nothing but Pressure Indicating Transmitter, Level Indicating Transmitter and Temperature Indicating Transmitter i.e. you will have a local reading of the parameter available on the field.

 

PT, LT and TT are Pressure Transmitter, Level Transmitter and Temperature Transmitter i.e. you will not have a local reading of the parameter available on the field.

 

 

The meaning was clear to me. The doubt arose from the fact that I had never seen the codes "LIT," PIT "etc.

[Chemitofreak]

 

 

I recently came across the use of the codes “LIT”, “PIT”, “TIT”, inside the typical symbol of “instrument mounted locally” (simple circle). I had never seen it before. Is it a mistake?

 

If, for example, I normally indicate "PT" is the "I" implied? In this case "PIT" would be redundant but not wrong.

 

Also I came across some "PIC" mounted locally. Is it possible? Maybe it is some old type local controller, but I wonder how much space it can find in modern industry.

 

PIT, LIT and TIT are nothing but Pressure Indicating Transmitter, Level Indicating Transmitter and Temperature Indicating Transmitter i.e. you will have a local reading of the parameter available on the field.

 

PT, LT and TT are Pressure Transmitter, Level Transmitter and Temperature Transmitter i.e. you will not have a local reading of the parameter available on the field.

 

 

The meaning was clear to me. The doubt arose from the fact that I had never seen the codes "LIT," PIT "etc.

 

 

Depends on what legend philosophy the client uses