VS Series Helium Mass Spectrometer Leak Detectors
1-28
DRAFT 4/
23/15
➅ Analog Output Banana type output connector for an Isolated Leak Rate Analog
reading. The Red connector is a signal positive terminal; black is
the signal negative terminal. Signal range: From 0 to +10 VDC.
Later models of the VS will be equipped with a DB9F connector for
the analog output. Pin #1 is signal (positive) and Pin #2 is return
(negative).
➆ Chassis (Earth)
Terminal
Provided for additional connection of the leak detector to the
building grounding system to improve ESD protection.
➇ 25 Pin I/O ❑ Inputs: Opto-isolated, 5 - 24 VDC 3300 Ohm resistive load.
All inputs are opto-isolator LEDs with series resistors.
❑ Momentary Inputs: Opto-isolated, 5 - 24 VDC 3300 Ohm
resistive load, requires 200 ms minimum pulse width.
❑ Outputs: Emitter follower with 10 Ohm series resistor, 14
mA max drive current, 24 VDC max.
For pin identifications, see Table A-6 on page A-14.
➈ Nitrogen Vent Port Nitrogen vent port (On newer models).
1.7 Features
The features for the VS Series leak detector are provided in Table 1-4.
Table 1-4 VS Series Features
Feature Description
Calibration Fully automated tuning and calibration using the internal or external
calibrated leak. The fast calibrate feature allows calibration in less
than one minute.
Zero Control Selectable mode background elimination with a unique, patented
Autozero<0 feature.
Leak Indication A bar graph (linear or log) indicator displays leak rates automatically;
alphanumeric indication on LCD display. A leak can also trigger an
audible alarm frequency that varies in proportion to the size of the
leak, dedicated volume control and programmable audio threshold.
Analog voltage is proportional to the leak rate.
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