Interested to Buy Any Domain ? << Click Here >> for more details...
I HAVE PRESSURE TRANSMITTER WITH TWO WIRES 24 VOLTS SUPPLY.IF
TRANSMITTER WILL GIVE SIGNAL TO THE DCS WHAT HAPPEN TO THE 24
VOLTS POWER SUPPLY IT WILL DROP OR REMAIN TO 24 VOLTS POWER
SUPPLY.
- 3 Answers
- 7757 Views
- I also Faced
- E-Mail Answers
Answer Posted / carl_ellis
You describe a situation with a 24Vdc power supply, a 250
ohm dropping resistor and a 2 wire loop powered transmitter
at 4.0mA
To get the voltage to vary across the transmitter, you have
to change whatever the transmitter is measuring to get its
output to change, or force an output with a HART
communicator. The loop current does not vary on its own,
it varies in response to whatever the transmitter is
measuring.
Carl's Loop Rules
The voltage across the power supply remains constant: 24Vdc
The voltage drops across the transmitter and analog input
vary with the current in the loop.
Assuming a bench setup with very short wire runs and a very
low wire resistance, then if the analog input dropping
resistor is 250 ohms, then
at 4.0mA the transmitter drops 23.0V, the AI resistor drops
1.0V
at 12.0mA the transmitter drops 21.0V, the AI resistor
drops 3.0V
at 20.0mA the transmitter drops 19.0V, the AI resistor
drops 5.0V
The sum of the voltage drops must equal the power supply
voltage.
You can bank on it.
Carl Ellis
Measure First
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
principle of dead weight tester ?
What is furnace draft control?
flow transmeter accuracy 0.075% of full scale & find ucertainty is 0.025 % so what is maximum limit band of uncertainty
Why is the orifice tab provided?
what is RTV function in in process control?
what is vibration a part of proceess variable? if vibration is a part variables then how we minimize the actual vibration on machine on load,? vision of instrumentation contrl plz ans me IPGDL interview question
field bus transmitter calibration procedure tell me
it is possible to check the fail safe condition in pressure transmitter. if possible how?
Punj lloyd is coming in our Jadavpur Universtiy campus for campus placement. Please send me some hints about the writtend exam. My email id is subratafriends@gmail.com
hii my name is sujith...i am preparing for HPVL GET 2010... so ,,,pls help me by send any previous questions or material to my site.....(Msujith_12@in.com) thank q
on interface level transmitter model(RTG3302-EMERSON) What is threshold valve how can we select correct threshold value T1,T2,T3,T4 When interface water & hydro carbon
How to decrease opening & closing time of on/off valve?
how to control pid
CONTROL VALVE OPERATING IN MANUAL BUT NOT IN MANUAL. WHAT SHOULD BE THE PROBLEM ?
can any send me a forbes marshall dtron 316 manual
