why 4 to 20 ma used at 0 set
Answers were Sorted based on User's Feedback
Answer / tang
Because we want to know the "life zero".
Life zero is a condition where there's a signal when the process is at 0%. For an example if we use 0mA instead of 4mA, we might don't know either the process is really 0% or the measuring unit is faulty(that will also indicate 0mA).
Is This Answer Correct ? | 17 Yes | 0 No |
Answer / venkadesh
because the transistor operating region range is 4-20 ma,these in between range is transmitter working in safe level
Is This Answer Correct ? | 1 Yes | 11 No |
why we are not using the turbine flow meter in the steam service?
What are the maximum packet size of: a) HART b) Profibus DP c)Profibus PA d) DeviceNet e) Foundation Fieldbus
i saw in my company drawing seat cable size as mensioned like this 12p*15 sqmm,12t*1.5sqmm, 9c*1.5sqmm. now what my que is what is mean by p , t , c.
How does a strain gauge measure pressure?
Flow tax range 0 to 100 mmh2o ,flow rate 40 tons /hr, I want change flow rate example 42 tons/hr so tx range ?
Pls can anybody tell me how much memory plc's has?in byte or in Kb
what is the difference between impact plate n coriolis type solid flow meters n how they works....n which one is better
square root calculation for dp flow transmitter? give me a explanation with example
Describe the function of Accumulator into the Pump
What is the difference between PLC and DCS?
What is cold junction compensation in thermocouples? How is it achieved?
what is the difference about HART, and 4-20mA signal?