Rosemount 1151GP smart pressure 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

[c2muti]

Excellent. Now can you please also show how to calibrate vacuum transmitters (-100KPag) if the calibrator pump is not making that much vacuum as is the case mostly. Also flow transmitter of very small range i;e in Pa (Usually used in air ducts)

I am serious that will really help.

Thanks

[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.

[c2muti]

For low range what if I use two pumps and give equal pressure on both sides with in limit and make zero calibration and for upper range increase pressure on high side with "fine".

Is this a correct procedure? I will look into you tip.

As for vacuum, Pressure Transmitter has only one port.

[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.

[c2muti]

For vacuum transmitter if its range is 0 to -100KPa, then what about this method?

Give 0 Kpa and adjust current output to 4mA with zero potentiometer. Then give pressure of +100KPa and adjust current output to 20mA until both are with in accuracy range and device linear.

[c2muti]

Now we know that with zero adjustment there is no effect on span (but with span adjustment there is effect on zero).

Keeping this in mind if we simply make output current equals 20mA with help of zero potentiometer while giving a pressure of 0KPa then this will work for vacuum.

I have verified this for upto -75KPa but not above since I cannot make further vacuum with my calibrator.

Can you verify this and tell its result in a video.

[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).

[knudahansen]

mmmmmm