Hi. I need to improve the measure in a HCl gas pipe made with GFK. Nowadays, the measuring is being done with a PTFE orifice plate and a Rosemount 1151 DP transmitter with tantal membranes. Does anyone know if there exists some coriolis sensor with internal PTFE/PFA or similar coating, suitable for working properly with HCl gas?

Stainless steel or hastelloy, could work well, but only if the water amount in the HCl gas is very low or zero. Higher quantities of water will allow the gas HCl to destroy even strong metals (except tantal, but a tantal instrument could be too expensive). Our problem is that we can't assure a low amount of water being carried by the HCl gas.
Any suggestion for more coriolis options? (ultrasonic sensor, vortex (coated, of course) or other?)

Thanks.

 

Micro Motion got Coriolis massflow sensor coated with Tefzel, which is similar to PTFE/PFA.

Here is a link to the datasheet:
http://www.documentation.emersonpro...ic_mmisami/documents/data_sheets/ps-00388.pdf

/Ulf

 

I couldn't access Ulf's link but I found this one
We buy lots of MM meters for acid service but i wasn't aware of the Tefzel option

http://www.documentation.emersonpro...ic_mmisami/documents/data_sheets/gi-00415.pdf

I'm sure other vendors have a similar product.

Roy