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4.3 Span adjustment by the external screw
The measuring range for each transmitter is determinated according to its type.
Span is changed by the outside screw with the mode setting switch in the housing set at span
position. The figure shown below is an example of “Mode setting switch” is attached.
(1) Set the mode setting switch to span position.
Mode setting switch
Set switch to “zero”
for zero calibration
(2) Apply standard input pressure corresponding to new Upper Range Value.
(3) Adjust output to 20mA by turning the outside screw
Decrease
Increase
(4) Then return to applying input pressure of zero again and make sure output is 4mA.
Note 1) If the transmitter is locked, it cannot be adjusted by the external adjustment screw.
Note 2) When a digital indicator is attached to the transmitter, make sure that the LCD lamp “ZERO” is
ON.
After adjustment, the transmitter should be kept energized at about 10 seconds to
write the adjustment results into memory.
Important