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4 - 20 mA #8433562 10/29/21 07:54 PM
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Amazing how much is still in use today. Do you ever deal with it?


To be determined
Re: 4 - 20 mA [Re: TurkeyHunter] #8433567 10/29/21 08:00 PM
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Sometimes.

Re: 4 - 20 mA [Re: TurkeyHunter] #8433572 10/29/21 08:03 PM
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Originally Posted by TurkeyHunter
Amazing how much is still in use today. Do you ever deal with it?



On the regular. Most modern industrial instrumentation still uses a 4-20 mA signal.

Re: 4 - 20 mA [Re: TurkeyHunter] #8433585 10/29/21 08:18 PM
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All the time. 15-85mA and 0-1000 Hz and two others we use daily in our line of work.

Re: 4 - 20 mA [Re: TurkeyHunter] #8433587 10/29/21 08:23 PM
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That's not funny.


(R-TX) .-- " TCNN CURL CRLB VFF VRNO AYR SNDL CGC TLRY MSOS "

_=====___=________==-



Re: 4 - 20 mA [Re: TurkeyHunter] #8433589 10/29/21 08:27 PM
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I was just explaining it to a customer and helping him 4 - 20 mA span a weighing device.


To be determined
Re: 4 - 20 mA [Re: TurkeyHunter] #8433615 10/29/21 09:14 PM
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Canned milk for me.


Quail hunting is like walking into, and out of a beautiful painting all day long. Gene Hill


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Re: 4 - 20 mA [Re: TurkeyHunter] #8433616 10/29/21 09:14 PM
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4-20 is our life.

Re: 4 - 20 mA [Re: TurkeyHunter] #8433627 10/29/21 09:28 PM
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Used to be my job in a refinery and pipeline, that and a little 10-50ma here and there.

Re: 4 - 20 mA [Re: NORML as can be] #8433628 10/29/21 09:28 PM
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Originally Posted by NORML as can be
That's not funny.

roflmao

Re: 4 - 20 mA [Re: TurkeyHunter] #8433725 10/29/21 11:43 PM
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All the time, but there are much better options today. I'm in the A&C business.


Originally Posted by Superduty
I am still looking for the perfect apron, one with reinforced knee areas would be perfect.

Re: 4 - 20 mA [Re: TurkeyHunter] #8434766 10/31/21 11:54 AM
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3 to 15 psi


One shot is all it should take.
Re: 4 - 20 mA [Re: TurkeyHunter] #8434794 10/31/21 01:04 PM
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4 - 20ma all the time before retiring.


Re: 4 - 20 mA [Re: TurkeyHunter] #8434967 10/31/21 03:27 PM
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Building Automation Controls…all the time for I/O. Converts easily to 2-10vdc or 1-5vdc if the input can’t handle current.

Re: 4 - 20 mA [Re: yotehater] #8435102 10/31/21 05:36 PM
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Originally Posted by yotehater
3 to 15 psi



Every pneumatic valve we have.

Re: 4 - 20 mA [Re: TurkeyHunter] #8435226 10/31/21 08:44 PM
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^ proportional valve


Originally Posted by Superduty
I am still looking for the perfect apron, one with reinforced knee areas would be perfect.

Re: 4 - 20 mA [Re: TurkeyHunter] #8435853 11/01/21 04:09 PM
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You cannot beat if for simplicity.
Full Digital wins for accuracy on custody xfer devices, but 4-20 does for simple valve control and process indicates still rules.
4-20 is pretty robust in noisy environments. It really takes fiber to beat it, then you drive cost and complexity up. Other side of the coin is that calibration takes longer for 4-20 than digital for pure digital devices.

Issue I am seeing is that new techs are not being trained in the need to calibrate the transmitter and receiver. I see issues all the time that result for trying to calibrate the entire loop by tweaking the transmitter.


We all need to practice Whoa more.
Re: 4 - 20 mA [Re: TurkeyHunter] #8435975 11/01/21 06:30 PM
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Yep, see it in HVAC modulating controls pretty often. 0-10v as well.


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Re: 4 - 20 mA [Re: TurkeyHunter] #8436000 11/01/21 06:54 PM
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Almost all of our control loops are 4-20. We have Smart transmitters for custody and product metering.


Originally Posted by unclebubba
Just to make sure that it is done thoroughly, I go both ways.

Re: 4 - 20 mA [Re: TurkeyHunter] #8436045 11/01/21 07:45 PM
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We have a lot of 4-20 with some newer stuff sprinkled in. We also have a couple of these bad boys in operation still. This one is used as a level control with a varied flow in and a variable valve (3-15) out. 100% pneumatic. These take a while to tune right.

[Linked Image]

Re: 4 - 20 mA [Re: wp75169] #8436054 11/01/21 07:55 PM
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Originally Posted by wp75169
We have a lot of 4-20 with some newer stuff sprinkled in. We also have a couple of these bad boys in operation still. This one is used as a level control with a varied flow in and a variable valve (3-15) out. 100% pneumatic. These take a while to tune right.

[Linked Image]



Haven't seen one of those in a while.

Re: 4 - 20 mA [Re: wp75169] #8436237 11/01/21 11:21 PM
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Originally Posted by wp75169
We have a lot of 4-20 with some newer stuff sprinkled in. We also have a couple of these bad boys in operation still. This one is used as a level control with a varied flow in and a variable valve (3-15) out. 100% pneumatic. These take a while to tune right.

[Linked Image]


The Foxboro 43AP is one of the most reliable controllers whether used as a primary or fail safe controller. 4-20........40 years of it!!

Re: 4 - 20 mA [Re: skinnerback] #8436242 11/01/21 11:25 PM
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Originally Posted by skinnerback
Originally Posted by wp75169
We have a lot of 4-20 with some newer stuff sprinkled in. We also have a couple of these bad boys in operation still. This one is used as a level control with a varied flow in and a variable valve (3-15) out. 100% pneumatic. These take a while to tune right.

[Linked Image]



Haven't seen one of those in a while.


Been many years for me too. I used to have to rebuild and calibrate those devils. Got to keep that air supply clean!

Re: 4 - 20 mA [Re: TurkeyHunter] #8436421 11/02/21 01:54 AM
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I started out doing instrumentation right out of high school in 1974. 4-20, 3-15, 10-50, then DCS, then advanced control, advanced applications/IOT, Cyber been there done it.

Retired form Honeywell Process Solutions, Now work for another large industrial tech company doing refining, Petro chem controls on the Texas coast. Jan 28th I’m done, retired for good and hope to heck I never see another transmitter or control system the rest of my life.

The only controls I plan on working on is timer on a deer feeder!!!


Thanks, Billy
Re: 4 - 20 mA [Re: Gringocazador] #8436448 11/02/21 02:13 AM
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Originally Posted by Gringocazador
I started out doing instrumentation right out of high school in 1974. 4-20, 3-15, 10-50, then DCS, then advanced control, advanced applications/IOT, Cyber been there done it.

Retired form Honeywell Process Solutions, Now work for another large industrial tech company doing refining, Petro chem controls on the Texas coast. Jan 28th I’m done, retired for good and hope to heck I never see another transmitter or control system the rest of my life.

The only controls I plan on working on is timer on a deer feeder!!!



Same here, but I didn't start until I graduated High School in 1995. Instrumentation & Electrical. Even since then, it's amazing how much the technology has improved. It wasn't that long ago that everything was pretty much analog. Did some major upgrades in plants and refineries, entire Control Room upgrades. Out goes the big, old, heavy analog equipment and in with Honeywell & Yokogawa DCS systems.


Congrats on the retirement, enjoy!

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