why we use 4-20 mA for calibration of the instruments.why
we cant use 0-20 mA?
- 5 Answers
- 9386 Views
- I also Faced
- E-Mail Answers
Answer Posted / nirmalya basu
In both of the measurement 20ma represents full data and 4ma
or 0ma shows no data.But with 0ma we cant diagnose the wire
breakage in the transmission line but with 4ma we can diagnose
because if this type of fault is occurred then it shows
0ma.Thats why 4 20ma is used.
| Is This Answer Correct ? | 8 Yes | 0 No |
Post New Answer View All Answers
What are de-saturators?
Coal mill Instruments Equipments for cement plant And process diagram ?
how can i check vortex shedder bar it is ok? if there is ohms condition are shown correct?
what is 24vdc live and dry supply
what is gas metering system? gas chromatograph? and gas compressors?
I am having a Phoenix digital to modbus converter. The o/p of the same is connected to flow computer FB407. But the digital signals are updated only after one minute in the flow computer. what may be the cause of delay in communication? Flow computer is having a scanning period of less than 1 sec.
What is the cascade control
What is stripper & spilitter ? Diffrence in this.?
what can of fault ofently come in vibration mesurement?
what is RTV function in in process control?
In VVVF DRIVES VOLTAGE IS ALSO VARY WITH THE FREQUENCY. HOW? WHAT IS THE DIRECT FORMULA RELATING THESE TWO.
In a gas over oil actuator, after the opening/closing of valve, how the gas is vented out? How does the hydraulic/gas circuit function?
key phaser where is use and work
When doing a liquid seal on a differential flow transmitter , most of the time the sealing liquid will be heavier then the process fluid. For wich application will the sealing liquid be lighter than the process fluid if transmitter is mounted below the process line.
We Have Two Field bus Pressure Transmitters of Different Sensor Range (I.E One is of Lower range and Another is of Higher Range).Is same Process Line. My Question is Can i provide Saturation Limit to my field Bus Transmitter as We can provide Saturation current limit to HART Instruments. As During Low Pressure Both Working OK ,But During High Pressure, transmitter with Lower sensor range Goes to Fault mode as Beyond its Sensor Limit it can Measure, So may I provide Saturation point Some where to Suppress This Fault during High Pressure.
