Interested to Buy Any Domain ? << Click Here >> for more details...
Hi Frnds , If Suppose 1 Pair cable of 1.5 sq mm is used for
Transmitter and instead of 1.5 sq mm if i used 0.5 sq mm
cable will the resistance change will occur and does it
affect our transmitter reading. plz mail ur answer to
ntnkamble@gmail.com plz immediately mail ur reply
- 1 Answers
- 4180 Views
- I also Faced
- E-Mail Answers
Answer Posted / carl_ellis
It depends on how much voltage the field transmitter needs to operate and the total loop resistance of the loop circuit .
Every 2 wire loop powered transmitter has a specification for the voltage required to drive a given loop resistance. Sometimes that is a formula, sometimes a load line graph, sometimes a statement like "minimum liftoff voltage is 17.7V", or rarely, a vague statement of maximum loop resistance (common with active analog outputs, rare with loop powered transmitters)
Excessive wire resistance in a 2 wire loop powered transmitter circuit can affect the operation by
- preventing the transmitter from turning on and operating
- allowing partial operation at lower current outputs, but failing to operate at higher current outputs. That failure can be either an output that just never exceeds a certain value or a transmitter that cycles on-off-on-off an never initializes.
If there is sufficient voltage to run drive the total loop resistance, then the transmitter could function normally.
You need to calculate the wire resistance over its total wire run length (out and back) and know what the receiver's analog input resistance is. Then look up the specification for how much resistance the transmitter's can drive and see whether your loop resistance is lower than the maximum.
Carl Ellis
Measure First
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
I need control valve ISA hand book. Is there any site to download that big book containing all the pages. Written by Paul Friedmann
State some of balance principle’ advantages?
Basically iam Instruemntation Engineer, but Iam interested in Instruments design engineering, so plz guide, is there any course, training or Softwres to become Instrument design engineer??.
Give Detail information about plc,dcs,and scada system?
can u plz send me technical questions asked in SCHNEIDER ELECTRICAL technical paper?
What is solenoid valve? Where it is used?
How to convert mmWc(mili meter water colam) to tph(ton per hour)?
Instrumentation Safe Guarding test. How to determine the interval time of the test. eg:Halfyearly,Every year,Every three years etc.
full process of gas turbin?
How to calibrate the flow transmitter
Can any body help to get Rsemulator 5000 free from internet if possible then give me any link or any help .
please any body have most important data for study for saudi aramco test of instrument QC thanks email shahnaveedullah@gmail.com
What is the diffrence between digital signal processing and discrete signal processing?
how can i calibrate the temperatuture gauge used by temperature bath(dry block) i mean step by step procedure?
how many types of preheaters are in cement industry & what r they can any body explain?
