Varian 979 Series, Operation Manual

Page: 41 / 140

Model 979 Series Helium Mass Spectrometer Leak Detector
DRAFT 9/15/03
1-19
Pressure Indication Test port and spectrometer pressure bar graph displays and test port pressure
alphanumeric indication on LCD display.
Spectrometer Tube Sensitivity optimized design, header mounted ion source with dual thoria-coated
iridium filament, preamplifier, ConvecTorr
®
, and vacuum gauge.
Automatic Valve
Sequencing Microprocessor-controlled valve operation provides automatic system cycling.
Safety Interlocks A valve system design that completely protects the high-vacuum system under
test against pressure surge and power interruption.
Cycle Time Blanked port can be cycled to the fine leak test in 4 seconds. An auto sequencer
feature provides clear accept/reject signals and allows programming of a
complete test cycle (START/ROUGH/TEST/VENT).
Test Port NW25; A 1
1/8
" (28 mm) ID Compression Port is available as an accessory.
Remote I/O Capabilities Interface (DB-37S) with optically isolated (5-24 VDC) outputs and inputs,
Non-isolated Serial RS-232 interface, and Non-isolated Analog output (0-10 V).
Non-isolated Remote Control (DB-9S) interface.
Accessories (optional) Universal Remote (part # L9558301) with 25 foot cord, External Calibrated Leak,
and Power Probe.
Recommended Operating Ambient Conditions
Installation Indoor use only. Altitude up to 2000 m (6,400 feet). Installation (Overvoltage)
Category II, Pollution Degree II according to UL3101-1 Standard
Temperature +12 °C (54 °F) to +40 °C (104 °F) for Wet Version
(w/oil-sealed mechanical pumps)
+5 °C (41 °F) to +40 °C (104 °F) for Dry Version
(w/TriScroll™ mechanical pumps)
Humidity Maximum relative humidity (HR) 80% for temperatures up to +31 °C (88 °F)
decreasing linearly to 50% HR at +40 °C (104 °F). No hoarfrost, dew, percolating
water, rain, solar irradiation, etc.
Air Pressure 75 kPa (563 Torr) to 106 kPa (795 Torr)
Storage Ambient
Conditions Relative humidity: 0% to 95%, non-condensing. Temperature:
−
20 °C (
−
4 °F) to +60 °C (140 °F)
Power Requirements 100 VAC, 20 A, 50 Hz / 115 VAC, 20 A, 60Hz or 230 VAC, 20 A, 50/60 Hz.
Start-Up current for “Wet” version up to 85 A peak for up to 10 seconds at
temperature less then 20 °C (68 °F).
Note:
1. Input voltage cannot be modified by customer
Note: 2. No extension cord can be used.
Table 1-1 979 Series Specifications (Continued)
Specifications 979 Helium Mass Spectrometer Versions