PGX 10 0 A N D PA X 10 0 |
P R E SSU R E T R A N SM I T T ER S | O I/P G X /PA X 10 0 - EN R E V. C
19
Adjusting lower range value / oblique
sensors
During installation of the transmitter, zero position shifts may
occur due to the mounting position; these must be corrected.
Possible cause includes the transmitter mounting position
when different from recommended vertical mounting position.
The transmitter must have reached its operating temperature
(approx. 5 min. after startup, if the transmitter has already
reached the ambient temperature) in order to perform the
zero shift correction.
There are two options (variant A or B) for calibrating the
4 to 20 mA output signal directly on the transmitter.
Variant A, without LCD option by using the pushbutton on the
electronic board.
1
Make sure that the measured variable corresponds to the
lower range value for the measurement process, i.e., that the
pressure that the process exerts on the transmitter is the
level of pressure required to generate a 4 mA output signal.
The pressure must be stable (observe set damping level).
2
Unscrew the housing cover and press the pushbutton on the
electronic unit (see the above figure) using a pin with
diameter of
≤
2.5 mm. Hold the pushbutton down for about
5/10 s. The output signal is set to 4 mA. The span remains
unchanged.
3
Make sure that the measured variable corresponds to the
upper range value for the measurement process, i.e., that the
pressure that the process exerts on the transmitter is the
level of pressure required to generate a 20 mA output signal.
The pressure must be stable (observe set damping level).
4
Press the pushbutton on the electronic unit (see the above
figure) using a pin with diameter of
≤
2.5 mm. Hold the
pushbutton down for at least 15/20 s. The output signal is
set to 20 mA.
5
Screw the housing cover back on.
The procedure described in “A” above does not affect the
physical pressure shown; it only corrects the analog output
signal. For this reason, the analog output signal may differ
from the physical pressure shown on the digital display or the
communication tool.
To avoid this discrepancy, you need to correct the zero
position shift (zero shift) as described under variant “B”.
Variant B, with touchscreen controls on the optional LCD
display.
For PGX100/PAX100 models, when in operating mode, the
device shows respectively “Z-S” on the left and configuration
menu icon on the right side of the display. Pressing left button
for approx. 3 s leads to the sub-menu for Zero and Span,
showing letters Z and S respectively in the left and right
bottom corners.
1
Press the Z button for less than 5 s, on the display appears
the text “Do you want to proceed with Zero?” and the two
buttons change their meaning to Yes / No.
2
Pressing No, the “Zero” operation is aborted, while pressing
Yes the “Zero” operation is confirmed/accepted and
executed.
3
The “Zero” operation executed with this modality set the
“Lower Range Value” with the pressure value measured in
that instant while the “Upper Range Value” is shifted of the
same quantity maintaining the “Span”, as difference
between the Lower and Upper Range values, same as before
of the “Zero” operation.
4
As soon as the Yes button is pressed, and the operation
executed, in the bottom line of the display it appears for 5 s
a message relating the result of the operation.
5
In case of success it appears “Oper Done”, otherwise, it is
displayed one message describing the reason for failure.
6
Likewise, when you press the S button for less than 5 s, on
the display appears the text “Do you want to proceed with
Span?” and the two buttons change their meaning to Yes / No.
7
Pressing No, the “Span” operation is aborted, while pressing
Yes the “Span” operation is confirmed/accepted and
executed, displaying a feed-back of the result in the bottom
line of the display.
8
The “Span” operation executed with this modality set the
“Upper Range Value” with the pressure value measured in
that instant while the “Lower Range Value” is not changed.
9
With this operation the “Span” value is changed.
NOTICE
NOTICE
