Azbil KFDB, User Manual

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Fig. 4-1. Transmitter Section
(7) Apply to the high pressure connection port a pressure corresponding to 100 % of the
measuring range.
(8) If the output pressure is shifted from 100 %, adjust the SPAN ADJ boss at the bottom of
the feedback bellows as follows:
If the output is higher than 100 %, turn the boss so that the output becomes lower than
100 % by an amount of 1/4 of the shift. (For example, if the output is 104 %, turn the boss
so that the output becomes 100 − 1/4 × 4 = 99 (%)).
If the output is lower than 100 %, turn the boss so that the output becomes higher than
100 % by an amount of 1/4 of the shift. For example, if the output is 98 %, turn the boss so
that the output becomes 100 + 1/4 × 2 = 100.5 (%).
The span can be adjusted also by turning the feedback bellows by inserting a pin in the
SPAN ADJ PIN HOLE instead of adjusting the SPAN ADJ boss. As you turn the feedback
bellows, the span changes as follows:
Clockwise turn of bellows: Output increases. (Span becomes wider.)
Counterclockwise turn of bellows: Output decreases. (Span becomes narrower.)
(9) Repeat the procedures of (5) − (8) until the required accuracy is attained.