The PHD-4 capillary leak consists of the following main parts (see figure 2):
1) Capillary leak;
2) Rechargeable Helium reservoir;
3) Pressure gauge (from 0 to 11 bar/160 psi);
4) Helium recharging valve (connections: Gc 1/4).
5) Calibration curves
6) Calibration chamber
7) O-ring
3. OPERATION
The calibration is done according to the following
steps:
1) First of all, move the PHD-4 and probe away
from Helium sources;
2)
Set the unit to Fixed Zero operation;
3)
Check the zero level;
4) Press simultaneously the SENS and MODE
pushbuttons for more than 2 seconds;
5) Insert the PHD-4 probe in the calibration
chamber (see figure 3); the display show:
- - > C a l i b r a t i o n
P
L
E
A
S
E
W
A
I T
*
and after a few seconds the display will be as show:
. . . . . . . . .
0
< - C A L - >
*
6) Read on the capillary leak gauge the actual
Helium pressure in the bottle;
7) Using the pressure/concentration curve
(attached to the Helium bottle neck), determine
the actual concentration value in ppm;
N.B.: Use the pressure/concentration curve plotted
for your PHD-4 typology.
8) Pressing SENS (down button) or MODE (up
button) pushbuttons, correct PHD-4 reading as
necessary;
9) Press the SENS and MODE pushbutton
simultaneously to exit the calibration routine and
memorize the new setting.
For any other information about the Calibration
procedure refer to the
PHD-4 instruction manual,
Section IV, §4-2
.
NOTE
The PHD-4 capillary leak is shipped with the
reservoir filled with helium at low pressure. To
operate it, a helium refilling should be performed,
according to paragraph 4.
Figure 2
87-900-073-01(B)
PHD-4 capillary leak
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