Interested to Buy Any Domain ? << Click Here >> for more details...
why using 4-20ma not using 0-20or why not using 1-
20ma???????
- 7 Answers
- 9024 Views
- I also Faced
- E-Mail Answers
Answer Posted / chandrasekarapandian
4-20 mA is the universal standard.
Justification:
1. easily splittable ranges 0 % = 4mA
25 % = 8mA
50 % = 12mA
75 % = 16mA
100 % = 20mA
2. 4 to 20 mA passed over 250 ohms coil resistance will
produce a suitable voltage sourcew of 1 to 5 volt.
3. LIVE ZERO
If our sensor to PLC wire connecton is open PLC reads 0mA
where as if the input of sensor in ZERo PLC reads 4mA.
| Is This Answer Correct ? | 14 Yes | 3 No |
Post New Answer View All Answers
What is offset in a control system.
hello can yoy pls send me previous papers of jindalpower and steel ltd.....'m from instrumentation..... mani1048@gmail.com
How d.p. Transmitter can be applied to open tank?
How to measure the dust in chimney(spm)?
A DP transmitter is used to measure the level of an open tank. The drain line of the tank is connected to a control valve, and is configured as, if the level of the tank is 90% the valve should get open 10%. And if the tank level is 10%, the valve should get open 90%. Draw wiring diagram and explain how to configure DP transmitter and control valve using HART communicator. If the span error at output is 1%, what will be the %opening of the control valve at 60% level of the tank?
principle of dead weight tester ?
explain key exchanges in all security modes WPA,WPA2,TLS?
HOW TO SOLVE PROBLEM WITH ENRAF LEVEL TRANSMITTER 854 ATG THAT PASSWARD DO NOT Exist INTO TRANSMITTER TO ADJUST LEVEL WITH PORTABLE PET 847, WRITTEN WRONG PASSWORD , I AM SURE THAT DEFAULT PASSWARD (W2=ENRAF2) IS THIS TRANSMITTER NEED TO REPLACE SOFTWARE AND HOW?
How to calibrate radar type level transmitter for interface level? Total liquid(liq.1 and liq.2), level both the liq individually? For. Both the liquid levels how the signal will go from transmitter to dcs? How to calibrate. Single radar 9:26:55 AM for 2 different liquids in a tank?
What is the purpose of the analyzer in petrochemical plant?
Make a ladder diagram on LSL valve will close, on PSL valve will open and start the motor
For crude application in floating roof tank, how to calibrate a DP Transmitter? How is the floating roof weight considered?
what is 24vdc live and dry supply
Hi,can anyone help me out with PhD programs related to Instrumentation field?I have a degree in electronic Instrumentation?
Questions on flow meters,few questions on HART protocol,
