Answer Posted / 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 |
Post New Answer View All Answers
Which type of pressure can be measured by primary elements?
Calibration procedure for Electro magnetic Flow meter
What is motion balance principle?
How to Calibrate Ultrasonic flow Transmitter in Field
Q- What are the application in which PNP transistor is preferred over NPN ?
What is 1:1 redundancy ?
Calibration procedure for water rotameters
What are the interlocks we have to check during the start up of LP/HP compressor?
1. what is modbus cable? 2. what kind of communication we are using for the interface of DCS, ESD and Third party cabinets? 3. What is serial communication and peer to peer communication?
How RAL(Rotary air lock)works in cement industry?
For crude application in floating roof tank, how to calibrate a DP Transmitter? How is the floating roof weight considered?
Which type of pressure can be measured by these elements?
How to calibration a control valve?
What are the maximum packet size of: a) HART b) Profibus DP c)Profibus PA d) DeviceNet e) Foundation Fieldbus
how many types of preheaters are in cement industry & what r they can any body explain?