i want to calibrate a transmitter in the range of -100 to
300 mmwc. How it is possible to measure -100 to 300?.
Answers were Sorted based on User's Feedback
Answer / carl_ellis
Atmospherice pressure equals zero pressure (gauge).
Vacuum pressures are less than atmospheric so are negative with respect
to atmospheric pressure. -100mm would be a vacuum pressure.
Pressures above atmospheric are positive with respect to atmospheric
pressure.
Carl Ellis
Measure First
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / carl_ellis
-100mm wc is a vacuum with respect to atmospheric pressure
as a reference.
Given the range, the pressure transmitter is likely a
differential pressure transmitter.
-100mm wc pressure can be produced with a vacuum source,
like a hand pump connected to the high side, with the low
side open to atmosphere.
Or 100mm wc positive pressure can be applied to the low
side, with the high side open to atmosphere:
DP = high side minus low side
DP = 0 minus 100 = -100mm wc
The URV, 300mm wc, is a calibrated with a pressure source
connected to the high side, with the low side open to the
atmosphere.
Carl Ellis
Measure First
Is This Answer Correct ? | 0 Yes | 0 No |
What is the GK Value in Flowmeter?
FOR CO/CO2/O2/NOX applications which of the following manufature is best? and what is the basic principle of gas analysers? ABB/YOKOGAWA/EMERSON/SIEMENS/TELEDYNE/THERMOFISHER
what the pid setting in controller
sir,would you please send me the Hindustan petroleum corporation limited papers(HPCL).my e-mail ID is ujjwal_sharma1983@yahoo.com
how to convert digital signal to analog signal in plc
Air pressure in a pressure vessel can rise or fall at up to 2.5kpa/s.The pressure is sampled every 0.5 seconds.If range of the the pressure indication is 0 to 1500 kPa, what is the max value of the error due to sampling in % of Span
If we increase PI controller what will be action.
WHAT IS THE DIFFERENCE BETWEEN DCS & PLC.
What is upsampling and downsampling?
what is actual difference between pressure Transducer & Pressure Transmitter.
what are the documentation and instrument identification system used to identify the correct device to be calibrated? name atleast three.
Definition of level