HD31
- 28 -
V1.6
4.4
P
RESSURE PROBES
The following SICRAM modules can be connected to the instrument:
•
PP471
:
module for connection to absolute, relative and differential pressure probes of the
TP704 and TP705 series. Connecting the module to the instrument displays both the instant
value and the peak value of pressure. The peak value is characterized by the word "
peak
"
alternating with the measurement unit.
•
PP472
:
module for the detection of the barometric pressure in the range 600...1100 hPa.
•
PP473S...
: series of modules for the measurement of the differential pressure. Available
full scale values: 2.5 / 10 / 20 / 50 / 100 / 200 / 500 / 1000 / 2000 mbar.
Pressure can be displayed in the following measurement units: Pa, hPa, kPa, mbar, bar, atm,
mmHg, mmH
2
O, kgf/cm
2
, PSI, inHg, inH
2
O. See paragraph 3.2 at page 13 for the measure-
ment unit selection.
Some measurement units require the value to be displayed with a multiplication factor. If the
displayed value is followed by the indication “E+3”, it means that the value must be multiplied
by 1000; if on the contrary it is followed by the indication “E-3”, it means that the value must
be divided by 1000.
The differential probes may be set to zero (see next paragraph). See paragraph 13.4 at page
99 for the calibration of PP472 module for the barometric pressure measurement.
4.4.1
Z
EROING DIFFERENTIAL PRESSURE PROBES
There can be a small difference between the two inputs of the differential probes, that’s why
the instrument, with equal pressure applied to the two probe inputs, doesn’t indicate zero val-
ue. A zeroing command for the differential value is available:
1.
Leave the two inputs of the differential probe open, so as they may detect the same pressure.
2.
Press
SELECT
to display the
ZERO
command in the command bar, then select the com-
mand by pressing
F2
.
Fig. 4.4.1: ZERO
command
3.
Select inputs
A
,
B
or
C
the probe is connected to by pressing
F1
,
F2
or
F3
respectively.
Fig. 4.4.2: selecting the differential probe for zeroing
Summary of Contents for HD31
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Page 149: ...HD31 149 V1 6 NOTES...
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