10
IM-P-20200626-01
6.2
Span Adjustment
(SPAN)
This setting can be used to adjust
the range (SPAN) according to an
entered value or adjusted with or without an applied
pressure. The maximum pressure
value that
can be
measured: The measurement at
ZERO (P101)
+
the entered value
SPAN (P102)
. If the
ZERO (P101)
is increased, the maximum measured value will
automatically be set higher
by the same amount
as
the zero. This will be explained step by step by an
example.
6.
Explanation
of
Programming Points
6.1
Zero Adjustment
(ZERO)
The transmitter is set to 0 mbar at
atmospheric pressure.
The
ZERO
can be adjusted at a lower or higher
point. This will be explained step by step by an
example.
Example: Increase ZERO
to
100 mBar.
1.
The measuring unit of the transmitter is set to
mBar. If not, this can be selected by choosing
the right measuring unit in program point
P104
.
2.
Navigate to program point
P101
, and push the
menu button to enter the menu.
3.
The actual measured value appear
s
on the
display.
4.
Increase this value with the arrow
button to
100 mBar, and push the button until
save appear
s
on the display.
5.
The transmitter will return to the home screen.
The measurement value at atmospheric
pressure is now -100 mBar. At an applied
pressure of 100 mbar the transmitter will
display 0 mbar.
The transmitter can be adjusted to zero in a real
process situation. The transmitter will measure the
pressure in an actual process. This measurement
will be used as the zero value (4 mA).
1.
Go to the home screen, the transmitter will
display the actual measured value.
2.
Push the
button until the actual measured
zero an
d
the message
ZERO PUSHED
appear
s
on the display.
3.
The transmitter will return to home screen.
Example: Measurement range 0 – 2000 mbar.
1.
The
span
must be set
to
2000 mbar
2.
Navigate to program point
P102
, and push the
menu button to enter the menu.
3.
Adjust the
SPAN
with the push buttons to
2000 mbar and push the button until save
appear
s
on the display.
4.
The transmitter will return to the home screen.
The span can also be adjusted to a real process
situation. The transmitter will measure the pressure
in an actual process. This measurement will be used
as the span value (20 mA).
1.
Go to the home screen, the transmitter will
display the actual measured value.
2.
Push the
button until the actual measured
span and the message
SPAN
PUSHED
appear
s
on the display.
3.
The transmitter will return to home screen.
TIP
P102 is the adjustment of the total span.
When a compound range must be adjusted
(for example -1 till +3 bar), a span of 4 bar
must be programmed.
The Zero (P101) must be set at -1 bar. The
transmitter is adjusted at - 1 bar = Zero and +3
bar = Span.
6.3
Cancel Mounting
Position Effect
All transmitters are calibrated
vertically. If the transmitter is
installed horizontally, the transmitter has a small
“mounting position” effect on the zero.
For example,
the pressure
value displayed
may be
0.002 mbar
instead of 0.000 mbar.
1.
Navigate to program point
P103
, and push the
menu button to enter the menu.
2.
Two choices appear on the screen:
Set
and
Reset
.
<6. Explanation Programming Points>
