Can a Rosemount 3051 pressure transducer connected directly to 24V communicate with a handheld operator? Why?
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Yesterday, I connected the Rosemount 3051 pressure transducer directly to 24V; I couldn’t establish a connection when trying to communicate using the handheld device, and adding a 200-ohm resistor didn’t help either. Is it necessary to connect it to a terminal board in order to communicate? Not quite sure
May I ask whether it should be connected in parallel or in series with the controller? Generally, a 250-ohm resistor is connected in series in the circuit, with the controller being connected in parallel.
Rosemont watches don’t drift easily; those that have been in use for over 10 years remain accurate, let alone ones that are only 3 years old
This post was last edited by 49205455 on 2015-8-28 19:08. I often correct it in this way. You must have picked up the wrong call. Otherwise, there’s a problem with your power supply. It’s not direct current. Or the noise is too high, and a filtering circuit is needed.
Connect this resistor in series in the circuit, and connect the HART hand-held device across the two ends of the resistor! Give it a try
You can achieve communication by inserting a 250-ohm resistor into the circuit, or by adding a safety barrier; otherwise, a connection of 375 won’t be possible
No way. Insert a 250-ohm resistor; try 475 as well, and test it at the transmitter
Yesterday I even used the transmitter from Rosemont; I connected a 250-ohm resistor in series in the circuit, and then connecting a 375 ohm resistor was sufficient.
A two-wire transmitter must have a load in order to form a current loop; one can take a look at the transmitter circuit. Generally, both PLC cards and instruments have a load-bearing capacity of between 250–500 ohms. A 250-ohm resistor is usually added. If the 24V power supply is connected directly to the transmitter without such a resistor, it may damage the transmitter, so be careful when making the connections. The hand controller is connected in parallel in the circuit, either at the transmitter end or at the load end; a 4-20mA current loop is used as the carrier for HART protocol communication.
That’s correct; a resistor must be added. What we usually use is one that’s already installed on the AI card
With 250 ohms in series, if the wiring is correct, there should be no issue with communication