Agilent Technologies VS Series User Manual

VS Series Helium Mass Spectrometer Leak Detectors
DRAFT 4/23/15
2-3
NOTE When calibration is complete, the leak detector reverts to
Fine
Test mode.
2.1.2 High Pressure Test Set-Up Procedure
The High Pressure Test mode locks the system into contraflow, offering maximum protection
to the spectrometer. This is useful in sniffing applications or when evacuating parts that can
contaminate the system.
To configure t h e H igh Pressure Te s t ( o ptional):
1. Open the Leak Rate Ranging screen (Section 2.2.4.4 “Leak Rate Ranging” on page 2-25)
and turn the High Pressure Test feature ON.
2. If sniffing, vent the leak detector and attach a Agilent Power Probe 
(Part Number K9565306) to the test port.
3. Monitor the test port pressure reading on the display and adjust the power probe flow
valve for a test port pressure of 0.5 to 1 Torr (2 Torr maximum). This pressure setting
allows for very rapid system response.
4. Press Zero on the Home screen to suppress the helium background signal.
High Pressure Test mode sensitivity is 10
4
to 10
8
atm cc/sec at test port pressures
between 1 and 2 Torr using the power probe. 
When High Pressure Test is activated, range stop defaults to 10
-7
atm cc/sec.
2.1.2.1 Additional Sniffer Mode Setups
The following are highly recommended:
❑ In the Advanced Parameters menu (Section 3.1.1 “Advanced Parameters” on
page 3-3) set the Auto-Zero < 0 to Inactive.
❑ Block Probe Alarm:
❑ Activate the speaker and adjust the volume in the Control Panel screen.
❑ Go to the Section 2.2.4.2 “Reject and Audio Set Points” on page 2-19 and
activate the Audio Set Point. Program a pressure that is, ex. 20%, less than the
adjusted pressure of the power probe for sniffing.

If the pressure falls below the programmed Audio Set Point, a steady state alarm
tone is activated. This is extremely helpful in sniffing applications where the
probe could become blocked, thus missing potential leaks.
High Pressure Test mode sensitivity is 10
-4
to 10
-8
atm cc/sec at test port pressures
between 500mTorr and 2 Torr using the power probe. When High Pressure Test is
activated, range stop defaults to 10
-7
atm cc/sec, but selecting between 10
-4
to 10
-8
atm
cc/sec is permitted.

Agilent Technologies VS Series Specifications

General

Brand	Agilent Technologies
Model	VS Series
Category	Security Sensors
Language	English