42
IM 767361-01E
Adjusting and Calibrating the Differential Pressure Transmitter using the MT220
Setting 0% and 100% by Applying Actual Pressure (Automatic Setting)
1.
Apply pressure which corresponds to 0%.
2.
Press the
Auto %
.
3.
Apply pressure which corresponds to 100%.
4.
Press the
Auto 100%
.
5.
Press the
%ERROR
key to activate % display mode.
Note
• Any 0% and 100% pressure values can be set as long as they are within the display range
and satisfy the condition 0% value < 100% value.
• If the applied pressure is outside the display range, it can be set as the 0% or 100% value
even if the
AUTO 0%
or
AUTO 100%
has been pressed.
• If the 0% value is greater than the 100% value,
will be displayed when the
%ERROR
is pressed. In this case, enter the correct 0% and 100% values.
• Automatic setting (using the
AUTO 0%
and
AUTO 100%
) is possible only when the
instrument is in normal measurement display mode.
• If the instrument is in relative display mode, % display will not be activated even if the
%ERROR
is pressed.
Error Display
The output voltage (or current) can be checked against the pressure input to
the differential pressure transmitter. The %ERROR value represents the value
obtained by subtracting the input pressure value displayed as a percentage from
the current/voltage value displayed as a percentage. .
The pressure values are shown under % display, and the DMM values are
shown under
%ERROR display.
Example
When 20 kPa is set as 0% and 100 kPa as 100%:
When the applied pressure is 40 kPa, 0% (25 - 25) will be displayed as the
%ERROR if the current is 8 mA, and 12.5% (37.5 - 25) will be displayed as
%ERROR if the current is 10 mA.
1.
Make the necessary settings for % display (Refer to the diagram of the previous
page).
2.
Press the
%ERROR
to activate %ERROR display mode.
Note
• If the %ERROR key is pressed to activate % display mode, the value measured by the DMM
function is also displayed as a percentage. However, this does not apply if the DMM function
is OFF.
• The display switches as follows each time the %ERROR key is pressed.
DMM function ON: normal measurement display→% display→%ERROR display→normal
measurement display
DMM function OFF: normal measurement display→% display→normal measurement display
kPa
%
V
mA
%
24V -OL -
Error
100%
Lit during an overload
Lit during 24 V output
Mark indicates selected units
Lit during %ERROR
display
Lit when AUTO
0, 100% is set
