Rosemount 1151GP smart pressure transmitter

This video shows a Rosemount model 1151GP "smart" pressure transmitter, discussing the difference between a "gauge pressure" device such this versus a true "differential pressure" device as well as the 4-20 mA circuit connections and HART digital-over-analog data communications.

Category:

Education

Tags:

• instrumentation
• DP
• cell
• gauge
• pressure
• transmitter
• 1151GP
• measurement
• smart
• HART

[nsganalongo]

we have a 1151gp transmitter, we are using a 475 hart communicator but we can not get through on its parameters, hart 475 can not access although we follow all wiring instructions/setup,we also connect a resistor of 250 ohms but still hart always read "NO DEVICE FOUND". We appreciate your help,thanks ACES COMPANY

[BTCInstrumentation]

@nsganalongo This will only work if the 1151 transmitter has been upgraded with the "smart" electronics board. If you pull the back cover off the transmitter and you see a printed circuit board (soldered traces) then you have an analog transmitter which will not communicate digitally with anything. Another way to check is to compare the long part number on the transmitter against the factory manual to see that what you have is indeed a smart transmitter.

[MrDearolddad]

excellent video. you explained it well and made it easy to understand. your videos are the best and most in depth on youtube about 4-20ma circuits.

[Tardjei939]

Didn't get to calibrate in school, so it was nice to find a video about it. studying for exams.

[Yotethrasher]

Thank you for the high quality video!

[MrInstrumentTech]

Any question anyone has may send me a message and I'll make a video just for you to try to answer any questions..

[g4ea]

the zero and span butoon its new

because the older trans was manualy

[BTCInstrumentation]

The method you outline here should work well. I won't be able to post a video on this any time soon (I've got too many other projects going right now).

[BTCInstrumentation]

Don't try to use two pumps to calibrate. You need a pressure calibration standard with low enough resolution to set the range you want to calibrate to with a single pump. Buy or make your own an inclined water manometer and you'll do just fine.

If your vacuum transmitter only has one port, you need a pump that can actually create the full amount of vacuum. Or, replace the vacuum transmitter with a DP transmitter and calibrate that with pressure on the "low" port.

[BTCInstrumentation]

You may "trick" a DP transmitter into thinking it's sensing a vacuum by applying a positive pressure to the "low" port. So, to calibrate a transmitter for a vacuum of -4 PSI, you could apply +4 PSI to the "low" side and it can't tell the difference.

To calibrate very low-range transmitters, use an inclined manometer as your pressure standard, and a compressible bellows called a "squeeze box" to generate the low pressure. Research products manufactrured by Dwyer for low-pressure apps.