High purity gas system selector

The LDGSS now brings to the gas industry the most reliable and easy way to provide clean gas to any process GC and online process analyzers. It's compact design, based on high purity connections with an unique diaphragm valve with no dead volume. It becomes the ideal solution for any stream selection needs. This concept allows a quick response time, the possibility to work in vacuum mode and avoid drifting problems.


number of inlets
  • 2 to 9 streams configurable
standard features
  • Front mounted stream bypass valves
  • Dry contacts that remotely give status of selected channel
  • Local or Remote control via 12VDC or 24VDC supply
  • Front Mounted rotary switch selector
  • 10u particle filter installed on every inlet
  • Stainless Steel diaphragm valve or peek 3 ways solenoid valve (must be specified when ordering)
  • BPR : Sample outlet back pressure regulator to maintain a constant sample outlet pressure.
  • VPB : Valves purge box for toxic and/or hazardous gases.
  • PG : Purging gas port for diaphragm valve version for high purity application or toxic/hazardous gases.
  • PR : Stream inlet pressure regulator for reducing stream pressure
  • C : Coated flow path for corrosive and absorbent gases
  • MBP : Metal bellow pump for low pressure application
  • O2 : Oxygen clean certified
sample bypass adjustable valve flow range
  • 0 to 500 ml/min
gas inlet & outlet connections
  • 1/16'' - 1/8'' - 1/4'' Stainless Steel Compression Type Swagelok compatible.
  • 1/8'' - 1/4'' Stainless Steel High Purity VCR type
purged gas vent connections
  • 1/4'' Stainless Steel Compression Type Swagelok compatible
  • 85VAC to 240VAC 50/60Hz
power consumption
  • 10 watts
maximum operating pressure
  • 30 PSIG (206Kpa) with peek solenoid valve version
  • 300 PSIG (2068Kpa) with stainless steel diaphragm valve version
minimum operating pressure
  • 3 PSIG (20Kpa) (lowest pressure can be achieved for glove box application by adding the optional metal bellow pump)
nominal working pressure
  • 20 PSIG (138Kpa)
remote control voltage input
  • 12 VDC or 24VDC at 200mA maximum


-xxx Operating Voltage
  • 120 Volts (-120)
  • 220 Volts (-220)
-X Number of Inlets
  • 2 to 9 : 2 to 9 streams
-X/X Gas Inlets Connections Size
  • 1/16 : 1/16 inches
  • 1/8 : 1/8 inches
  • 1/4 : 1/4 inches
-XXX Gas Inlets Type
  • VCR : Face seal Type
  • SWG : Compression Type
-XXX Options
  • BPR, C, VPB, MBP, PG, 02, PR

LDGSS Application Notes