87-900-073-01(B)
April 18
th
, 2011
PHD-4 capillary leak
Model 969-3540
1.
GENERAL
The Agilent PHD-4 capillary leak model no. 969-3540
has been designed to allow a fast, simple and effective
way to check the calibration of the Agilent HPD-4 leak
detector.
The PHD-4 capillary leak contains a crimped stainless
steel capillary to regulate the helium flow. The leak
element is attached to a 110 cc stainless steel reservoir
with an adapter that mates with the PHD-4 probe.
The reservoir has a pressure gauge for adjusting the
driving pressure behind the capillary leak element in
order to change the helium flow rate. The gauge
measures the pressure up to 11 bar (160 psig).
The calibration is obtained by comparing the Helium
concentration generated by the capillary leak in the
provided calibration chamber with the actual reading of
PHD-4 and correcting this one if necessary.
The value of the Helium concentration is of the
order of 100 ppm (for a reservoir pressure of 100
PSI, 7 bar), and is specified in the calibration curve
supplied with each unit.
NOTE
The supplied calibration curves are valid for PHD-4
devices equipped with the standard length probe.
2. DESCRIPTION
The PHD-4 capillary leak package is shown in
figure 1;
it includes the following parts:
1) PHD-4 capillary leak;
2) Nylon bag containing O-ring Parker 2-120 BUNA
(2 pcs.);
3) Instruction manual.
Figure1
INSTRUCTIONS
Agilent Technologies Inc.
121 Hartwell Avenue, Lexington, MA 02173, USA
Agilent Technologies Italia S.p.A.
Via F.lli Varian, 54 - 10040 Leinì (TO) - Italy
