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45
PP472
E
LECTRONIC
M
ODULE FOR
B
AROMETRIC
P
RESSURE
M
EASUREMENT
The electronic module PP472 measures the barometric pressure connected to its input in the range
600.0…1100.0 hPa. The resolution is equal to 0.1 hPa for the whole measuring range.
The
<
9/UNIT
>
key selects the unit of measurement of the displayed instantaneous value. The fol-
lowing units are available:
hPa, kPa, mbar, bar, atm, mmHg, mmH
2
O, kgf/cm², PSI, inchHg.
Ti
A1
b1
Ti
F1
Calibration
The module PP472 can be recalibrated by the user who has a precision pressure generator. The cali-
bration is carried out in two points: the first at 800.0mbar, the second at 1013.0mbar.
Procedure:
1.
Connect the module PP472 to one of the input of DO9847 and switch on the instrument.
2.
Enter into the Menu with the proper key and select the heading ‘5) Calibrate’ with the
<
5/DATACALL
>
key. The list of the modules connected to the instrument is displayed: select
the input which the module PP472 is connected to.
3.
The first screen appears as follows:
Supply the module input with a pressure of 800.0mbar. The bottom line displays the value meas-
ured by the instrument. The set point value can be adjusted with the arrows (
Up and Down)
up to
the pressure value which is really measured. Update the value with
<
ENTER
>
key and continue
with the second point pressing the
<
1/MATH
>
key.
4. The second calibration point is 1013.0mbar. If necessary, adjust the set point value with the ar-
rows (
Up and Down)
up to the pressure value which is really supplied. Update the value with the
<
ENTER
>
key and confirm with the
<
1/MATH
>
key. Now calibration is finished.
