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Old December 26th, 2016, 03:14 PM   #1
RonJohn
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Looking for a high temperature rated pressure transmitter

Good day folks. We've had to replace our boiler makeup water deaerator tank pressure transmitter quite often since commissioning the tank. The IFM units we use elsewhere cannot seem to handle the 230F (110C) for too long. What make/model have others used in similar circumstances? Looking for analog 4-20mA output, scalable to 0-30psi. Thanks in advance.
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Old December 26th, 2016, 04:55 PM   #2
danw
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The typical way to deal with high process temperatures is to use a longer impulse line, which since the medium in the impulse line is dead-headed, there is no 'flow' so the medium cools to near ambient temperature over a gradient.

But all pressure transmitters rated have some process temperature and ambient temperature maxiumum spec.

A Honeywell industrial tops out at 110C process in 85C ambient.

Wika F20 is rated 120C at 85C ambient.

Omega has a couple of those high temperature pressure transmitters
Omega PX91-MV at 204C or the Omega PX4200-I at 125 Deg C
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Old December 26th, 2016, 07:48 PM   #3
John Soltesz
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I've used many a Endress +Hauser Cerabar transmitter.
Cerabar PMC71 Process temperture -40 to 150C
Cerabar PMP55 Process temperture -70 to 400C
If you don't mind the price.
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Retired April 2015. Made it out alive!
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Old December 27th, 2016, 08:55 AM   #4
Crittenden
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Cerabar PMC71
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Old December 27th, 2016, 09:00 AM   #5
Crittenden
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Cerabar PMC71 Endress +Hauser Cerabar transmitter work great for higher temperatures, they use a ceramic diaphragm.
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Old December 27th, 2016, 10:16 AM   #6
boneless
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We use PR mostly (with built in converter), for higher temperature applications we use the long neck type. If it is still too hot, you may have to rethink your tank insulation.

Another option could be using thermo-couple instead.
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Old December 27th, 2016, 10:30 AM   #7
RonJohn
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Thanks for the responses folks.

DanW, I bet the longer impulse line could do the trick as I think this is what we have on our boilers. This'll be plan A.

John Soltesz & Crittenden: We use some E+H products elsewhere; I'll have to check these out. (Kudos, John, on making it out alive! I believe I did some service work at your old plant a few years back)

Boneless: Who is PR?
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Old December 27th, 2016, 10:37 AM   #8
boneless
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I did a boo boo, thought you we're look for temp. transmitter , sorry about that!

For pressure we use Danfoss or Yokogawa. +1 for the impulse line.

PR electronics, maybe more common in Europe .
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