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).

Answer / venkadesh

because the transistor operating region range is 4-20 ma,these in between range is transmitter working in safe level

What is voltage regulator?

1 Answers  

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what is plc? breif explain

3 Answers   APL,

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Lux meter is the measuring device to measure the lux level of lighting fixture. in industrial sector two types of lighting fixture is being used as street lighting purpose 1. HPSV (Sodium) and 2. HPMV (Mercury). HPMV having white light which is an combination of red, blue and yellow colour, while HPSV haivng Yellow lighting. in HPSV red & blue colour will be absent. during measurement of the lux level of HPSV and HPMV fixture. 1. Lux meter can measure the actual lux level of both fixture? 2. or it will show false reading for HPSV fixture light as it has only yellow light present. please give me answer

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Explain level troll principle & interface level measurement.

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what is mass flow meter, working principle of mass flow meter and its installation.

2 Answers  

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where is a level displacer is used?

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what is disadvantage of field bus (ff)type of instrument

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I have completed B.E. Instrumentation & control in 2009. i have 3 year industrial job experience in chemical plant.now, I want to join M.E. in external. so, Plese say easiet way and good institute name.

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Why Bently Nevada use negative voltage for vibration probes?

4 Answers  

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what is plc? Basic function of plc? application of plc in industry? What is lader diagram ? What is the main advantage to use plc in industry?

15 Answers   Schlumberger,

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can any one explain in which term we are flow flow is it volumetric r is it mass? and y

1 Answers  

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Briefly describe instrumentation job

1 Answers  

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