HART communication loop resistance

[@penguins-r]

Cleanest explanation on the internet. Thank you

[@sarwarimam4071]

Thank you for the best teaching in instrument calibration.

[@Maklaka]

Excellent presentation. Great work. Not many people can present systems like this clearly and concisely with a good demonstration.

[@merlissoto3923]

Excellent video demonstration!

[@BTCInstrumentation]

Yes, values other than 250 ohms will work as far as enabling HART communication. If you need a precision 1-5 VDC drop for 4-20 mA of signal, however, you'll need the precision 250 ohm resistor. As far as what resistance values are allowed, I'll refer you to the manual for the transmitter. The allowable envelope of resistance values differs depending on the specific model of transmitter (based on its minimum terminal voltage and the loop supply voltage).

[@BTCInstrumentation]

@brickboiler Yeah, one of my students decided to add a little "bling" to her Fluke 87.

[@SB-dc9qb]

Does the loop resistance need to be in the power supply circuit?

[@BTCInstrumentation]

The voltmeter is connected directly in parallel with the transmitter.

[@williamfransean6385]

Finally i understand

[@plangetee]

Hello Professor, where are you putting the terminals of your voltimeter in order to measure the millivolt signal that the HART communicator uses to digitally "talk" to the transmitter? (Note: if my question is worded incorrectly, please correct me, thanks)

[@mdirfankhan1865]

Video is very much helpful. Can u share the circuit diagram...

[@MD-cd7em]

YES SIRR..THANKYOU

[@dennyfuul]

its seem that the hard needs an AC signal to comunicate, what about if we use an AC power suplly? is it work ??

[@muhammadashiryounas4127]

hi,sir my question is can we use HART with 250 ohm in series to communicate with transmitter..or only parallel combination is required

[@brickboiler]

Is that first fluke 87 bedazzled?

[@plangetee]

Can I use a 330 ohm resistor instead of a 250 ohm resistor? Or 220 ohms? 250 ohm is non-standard as you know. I can't get ahold of 250 ohm in time for this commissioning. THANKS!

[@Archuhz]

y u no series Rtotal

[@bgemp12]

In real world, where should the loop resistance to be wired? At the DCS cabinet? Thanks.

[@waleed9261]

Could you plz tell me why we open the low side of DP transmitter during calibration?

[@abdelssami]

so our reference would be the atmosphere pressure

[@samuelgomez2933]

Do you have the diagram for this set up?

[@atulkusvaha4366]

Please tell me how to check temperature transmettre is working good condition.

[@nysMEnyd]

brilliant. i get it!

[@lovely2010man]

okay good job

[@rapidfiredm]

you need to increase volume

[@souravrsubhannita04]

sir can u give me the loop diagram plz?

[@justicemboumbamboumba7484]

comment pour etre instrumentiste

[@kuttyrose19]

how to check LT/

[@dieguyn]

Find and see this video Configurador Protocolo Hart - Bluehart Eletrosert

[@didamaciel9841]

HART data signals are AC voltages? Could you please elaborate a bit more?

[@QingcuiWong]

More information: www.fieldcommunicator.net

[@sijoyamby]

yeh

[@nayrbsworld3048]

ok thanks, so without 250ohms resistance the digital AC communication will no work, because the DC voltage will have a low pass filter wherein it will not allow any AC voltage

[@KendlRecords]

Am instrument from bangladesh. Am looking to take all of your jobs in america. Please help find job. Thank