Abrasive Environment Pressure Sensor

It could be that no suitable instrument exists. It is worthwhile zooming-out, and stating what the signal is intended to do, lest there might be other ways of doing what is wanted. So, is the <...pressure...> signal for control or for monitoring? Why is the information of value?

One presumes that, if electrical, the unit is intended for use in a hazardous area?

I am monitoring the pressure for data collection. I have found some that are used in concrete pumping but they do not go to a low enough pressure.

Of what purpose is this <...data collection...>? Why is the <...data...> of value?

Please tell a story and thereby help the forum to provide the help requested.

This will be used in an injection molding system

We want to monitor the high and low pressures present in the system as the material is pushed (and sucked) through the piping. It has to pass through a filter and valving so we are also looking for a pressure drop across the filter. The data will be used to monitor the process but also to discover all of the pressures throughout the system as the process goes through all of its steps. This data will be used to make changes if needed and once done used to monitor the health of the system.

You've been given several good options. One other would be to purge the pressure port with a small flow of clear cyclohexane, if available.

pipe diameter?

temperature?

Still missing...

ID is about 5/8 inch, flexible pipe. I could easily make it hard pipe though where I install the sensors. Temperature is about 70 F.

https://www.gp50.com/product/model-540-im-series-flush-mount-canbus-pressure-transmitter-automotive-testing/

https://www.validyne.com/categories/pressure-measurement/pressure-transducers-and-transmitters/

If the forum knew more of the story, it might be able to suggest non-contact methods such as back-pressure on a bubbler; an inert gas such as nitrogen might be available, perhaps.

Materials compatibility might suggest the same material as the inside of the pipe, which would give clues as to which way to go.

Here's a thought: If you know the density of the slurry, what if you had a clear vertical standpipe. Would not the slurry rise in the pipe until the hydrostatic pressure equals the pressure to be measured?

I'm not sure it would flow well enough and the pipe is actually flexible so that it can move around so it would be difficult to keep it level and straight.

...see now that's a key piece of information....lol

I could easily make it hard pipe where I install the sensors though.

Thank you, I will check these out.

Check out this link..they deal with abrasive media transmitters...

https://campaign.stssensors.com/blog/pressure-sensor-abrasive-media-vulkollan

You also might consider a pig tail tubing,facing UP, between your transmitter and sensor port.The pigtail will be filled with fluid,and keep the transmitter separated from the abrasive media.

KISS if possible.

Thanks for the link. I was on there site yesterday and requested information from them.

I would look at a diaphragm seal. They are used to isolate the pressure sensor from the incompatible medium being measured. Since your pressure range is on the low end you need consider the diameter when choosing what will work best for you. You can check out a description of these devices at https://www.branom.com/diaphragm-seals.

This is one distributor I'm familiar with; I'm sure there are many in your area.

Thanks, I have been thinking about the wear on the metal or ceramic diaphragms that are often used on these pressure sensors and how quickly I may have to repair / replace them.

I would discuss it with the application engineers at the manufacturers; they should be able to provide you the best choice of materials. Another consideration, if the seal were to fail the medium used to fill the seal needs to be compatible with the material it's measuring so the application folks need to be aware to provide the appropriate fill material.