OT: Searching for a level transmitter

Pierre

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• Sep 7, 2005

• #1

I'm trying to find some level transmitter. They are pressure transmitter in the shape of a small tube (3/4" x 3") at the end of a cable. You just drop them to the bottom of a liquid tank and it transmit the head above it.

My problem is not to find them but to find one that is all made of Teflon.

Any leads?

 

Tom Jenkins

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• Sep 7, 2005

• #2

I found these sources:

www.drexelbrook.com

www.coleparmer.com
www.pressure.com

www.pressuresystems.com KPSI - I've used them in the past

www.usabluebook.com

At this site:

http://www.wef.org/CmsWEF/Pages/BuyersGuide/EndUserHomeSearch.aspx

Cole PArmer and USA Blue Book are "retailers" but they stock a lot of stuff.

 

Greg Dake

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• Sep 7, 2005

• #3

Wika

I use the Wika submersible pressure transmitters for open tanks a lot, they have worked well in our utility tank applications.

Greg

 

Mark Buskell

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• Sep 8, 2005

• #4

Submersible Level Transmitter

http://216.65.112.97/Catg1.asp?Cat1ID=79

 

rsdoran

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• Sep 8, 2005

• #5

You state level in the title but pressure in the request, what is the specific need?...ie level, pressure, water-column,..? 4-20ma output?

Is this similar to what you are looking for?
http://www.sigmacontrols.com/submersible_level_sensor_7000.htm

 

Greg Dake

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• Sep 8, 2005

• #6

I caught that too Ron. I made the assumption it was indirect level measurement based on static head pressure.


Greg

 

danw

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• Sep 8, 2005

• #7

Your request for "all teflon" infers a very nasty environment for the typical stainless steel bodies or wetted parts that are used on submersible transmitters.

That sort of issue is often addressed by the use of non-contact level sensors - either radar or ultrasonic. These devices mount up high, above the liquid level and do not contact the liquid.

You might consider trying Siemens/Milltronics for either.

https://pia.khe.siemens.com/index.asp?Nr=4920

 

Tom Jenkins

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• Sep 9, 2005

• #8

In my experience measuring level with a pressure transmitter is more economical and more reliable than ultrasonics. There are a lot of things that cause ultrasonics to get goofy, such as false echoes, foam, interference from tank walls, and wind.

 

danw

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• Sep 9, 2005

• #9

Tom,

Yes, ultrasonic has limitations. But a submersible pressure transmitter failing due to nasty environment is a limitation, too.

If a 316 SS body/diaphragm of an Ametek/Wika/Siemens/Blue Ribbon/whateverBrand commercial submersible transmitter isn't suitable, as a request for all teflon infers, then that's when non-contact technologies make sense.

Pierre's problem was not finding a submersible transmitter, it was finding one "all made of Teflon".

Dan

 

Tom Jenkins

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• Sep 9, 2005

• #10

danw said:

"all made of Teflon"

Click to expand...

I took some liberties with this and assumed the Teflon was associated with the diaphragm only. It is common in corrosive environments to have a level transmitter with a stainless body and a Teflon diaphragm. Standard construction is stainless body and Buna-N or EPDM diaphragm.