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PP473
E
LECTRONIC
M
ODULE FOR THE
M
EASUREMENT OF
D
IFFERENTIAL
P
RESSURE
PP473 S1, S2, …, S8 electronic modules measure differential pressures with 10, 20, 50, 100, 200,
500, 1000 and 2000 mbar full scale.
These modules provide the pressure instantaneous value related to variable 1 (A1, B1 or C1 de-
pending on the input to which the module is connected).
The <9/UNIT> key switches the unit of measurement of the instantaneous value. The available
units of measurement are:
Pa, hPa, kPa, mbar, bar, atm, mmHg, mmH
2
O, kgf/cm
2
, PSI, inchHg.
Ti
A1
F1
>>
>>
Some units of measurement require a multiplicative factor: “+3” at the top means that the displayed
value has to be multiplied by 1000.
Zero Command
Differential probes might cause a slight difference between the two inputs, so that the instrument
will not show the value zero, even if the pressure applied to the two inputs is the same. To this
purpose, the instrument provides a reset command of the differential value: leave the probe in-
puts open to let them measure the same pressure, then press <0> to reset.
>>
>>
>>
>>
>>
>>
Ti
Ti
Ti
A1
A1
A1
F1
0
The commands bar will show either null_A, null_B or null_C, according to the input to which
the module is connected. Press the corresponding function key to reset differential pressure: the
instant value will be set at zero.