Answer / basil

TWO WAYS.WE WANT TO GIVE 150 MMWC ON THE LOWER SIDE AND
ZERO PRESSURE ON HIGHER SIDE AND SHOULD GET THE OUT PUT OF
4 mA.AND ZERO PRESSURE ON THE SIDE OF LOWER AND 400 mmWC ON
THE HIGHER SIDE AND SHOULD GET THE OUT PUT OF 20mA.
IF NO PRESSURE ON BOTH SIDES THE OUTPUT SHOULD BE 8.36 mA
(IF IT IS A 4-20mA TRANSMITTER)

Answer / naresh makhwani

We always have to apply pressure on the high side of the
transmitter. You cannot apply pressure on the lower side,
though if you will apply it gives you the negative reading.

Answer / jigar anadkat

You Can Calibrate in Two different Ways:

1) By applying normal pressure according to the range i.e.
(-150) mmwc with vacuum pump and observe 4 mA and keeping
this pressure on LP side apply 400 mmwc in HP side and
observe 20 mA (in steps).

2) Apply 150 mmwc on LP side and observe 4 ma [HP-LP=0-150
= (-150 )], then keep LP side open 0 mmwc and create
550mmwc (400+150) span by applying pressure on HP side and
observe 20 mA (in steps). If no pressure on both the side
your TX will give o/p = 8.36 mA

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