Agilent Technologies PHD-4 Manuale utente

87-900-073-01(B)

April 18th, 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

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 Page 2/3

4. REFILLING THE HELIUM RESERVOIR

When the reservoir pressure goes down to

approx 30psi (2 bar), the capillary leak needs to

be refilled with pure Helium.

Refilling steps:

1) Attach a clean line from pure helium bottle to

the fill valve of the leak, but do not tighten

the connection;

2) Flow helium through the line to purge the

remaining air from the line;

3) Tighten the connection to the valve;

4) Open the fill valve;

5) Fill the leak to 11 bar (160 psig);

6) Loosen the connection from the helium

source;

7) Open the fill valve and vent the leak to 2 bar

(approximately 30 psig);

8) Repeat steps 3-7 three times to assure gas

purity;

9) Fill to the pressure indicated on the label to

obtain the desired flow rate.

To avoid clogging of the capillary, the line from

your helium source must be clean and free of

moisture. Copper or stainless steel lines are

recommended. A rubber hose should NOT be

used.

5. STORAGE

Capillary leaks are subjected to clogging and

must be kept clean and dry. Store in an air-tight

container when not in use. Care should be

takenthat the end of the capillary tube is not

exposed to oil and dirt.

Recalibration of the gauge is recommended on

an annual or biannual basis depending on the

severity of the environment in which the leak is

being used.

DISPOSAL

Meaning of the "WEEE" logo found in labels

The following symbol is applied in accordance with

the EC WEEE (Waste Electrical and Electronic

Equipment) Directive.

This symbol (valid only in countries of the

European Community) indicates that the product it

applies to must NOT be disposed of together with

ordinary domestic or industrial waste but must be

sent to a differentiated waste collection system.

The end user is therefore invited to contact the

supplier of the device, whether the Parent Company

or a retailer, to initiate the collection and disposal

process after checking the contractual terms and

conditions of sale.

CAUTION

87-900-073-01(B) PHD-4 capillary leak Page 3/3

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