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i want to calibrate a transmitter in the range of -100 to
300 mmwc. How it is possible to measure -100 to 300?.
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Answer Posted / 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
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