Adjusting and Calibrating the Differential Pressure T
ransmitter using the MT220
41
IM 767361-01E
Adjusting and Calibrating the Differential Pressure Transmitter using the MT220
DMM Function
1.
If nothing is displayed in the lower part of the screen, press the
ON/OFF
under the
DMM group to turn the DMM function ON.
2.
Press
DC5 V/20 mA
to set the mark to either V or mA.
3.
To cancel DMM measurement, press the
ON/OFF
under the DMM group again to
turn the DMM function OFF.
Note
The display range for the measured values are shown below.
Voltage –6.0000 V to +6.0000 V
Current –24.000 mA to +24.000 mA
% Display
If 0% and 100% pressure values have been set, the measured values can be
displayed as a percentage (%) relative to these 0% and 100% values. 0% and
100% values can be set by directly entering a desired numerical value or by
applying actual pressure.
If % display mode is active during measurement of current or voltage using the
DMM function, the measured value is displayed as a percentage: 1 to 5 V or 4
to 20 mA being equivalent to 0 to 100%. The display range for pressure and
voltage/current values is shown below.
Pressure: 999.99%.
is displayed in the upper part of the screen if the
value exceeds the specified number of display digits.
Current/voltage: 0 to 24 mA/0 to 6 V (–25 to 125%).
is displayed at the
lower part of the screen if the input exceeds this range.
Example
When 20 kPa is set as 0% and 100 kPa as 100%:
If the input pressure is 40 kPa, 25% will be displayed in the upper part of the
screen. 25% (8 mA) will also be displayed in the lower part of the screen if the
output current from the differential pressure transmitter is correct..
100%
25
0
20 40
100 kPa
100%
37.5
25
0
4
8 10
20 mA
Setting 0% and 100% by Entering the Desired Numerical Value (Manual Setting)
1.
Press
MENU
.
Use the and to select
, then press
ENTER/LOCAL
to activate the 0%
pressure setting screen.
2.
Use the , and
to enter the value corresponding to 0%, then press
ENTER/
LOCAL
.
3.
To set the value corresponding to 100% value, use the
, and then press
ENTER/LOCAL
.
4.
Press
MENU
to return to the normal measurement screen.
5.
Press the
%ERROR
to activate % display mode.
