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Gas Switching Systems


Gas Switching Systems

Gas Switching Systems for multi channel measurements of respiration, photosynthesis, nitrogen fixation

Qubit Gas Switching Systems have been designed to work with Q-Box Packages to allow measurements of gas exchange from multiple samples.  Our Gas Switching Systems allow monitoring of up to 8 different channels with a single Q-Box system such as Q-Box RP1LP Low Range Respiration Package, Q-Box RP2LP High Range Respiration Package, and up to 4 different samples with Q-Box NF1LP Nitrogen Fixation Package and Q-Box CO650 Plant CO2 Analysis  Package.

Qubit Gas Switching Systems allow multichannel measurements of respiration (VO2 and VCO2), nitrogen fixation, photosynthesis and transpiration.

Components of the Gas Switching System:

  • G244 Eight Channel Gas Switcher OR G243 Four Channel Gas Switcher

  • C200 Digital Control Unit

  • Flow Meters (8 OR 4)

  • G261 Low Pressure Regulator

  • Tubing and Connectors

  • Customized Experimental Files (Logger Pro)

  • Flow-through Chambers (Optional)

When Gas Switching System is used with a Q-Box Package the gas pump (Q-P651) carries the reference gas via the G261 low pressure regulator to the flow meters.  Each flow meter supplies and manually controls the flow of gas to each sample chamber.  Output gas from all sample chambers is carried to the gas inputs on the gas switcher (G244 or G243).  The specific chamber is selected by the software and its gas is carried to the analyzers and the flow monitor of the Q-Box via a solenoid valve associated with that channel inside the gas switcher.  The switching between chambers is controlled via the digital control unit (C200) and the software.   The output from the remaining chambers vents via the gas switcher vent ports to the atmosphere.  As a result all chambers have gas flowing past the sample at all times.  Channel 1 is always used as a reference channel.

Three modes of operation are available for the gas switching system.  Mode 0 allows sequential measurements of all channels from 1 to 8 (in eight channel system) with reference channel being measured every 8 channels. Mode 1 allows sequential measurements of all channels with the reference channel being measured after each sample channel.  In this mode the reference signal is measured more frequently.  User can select the No of ChannelsModeDwell Time (on each channel)l andEventTime (time period for calculating of average data at the end of each DwellTime) in the software. Manual mode can also be selected in user parameter ManualCh to  allow monitoring of a single channel during the setup of an experiment.

Raw data screen with meters for setting of user parameters:

raw data screen

Final data for channel 2

ch 2 VCO2 VO2 data

Software allows viewing of data by channel and provides direct calculations of the key parameters such as VO2, VCO2 and RQ (when used with Q-Box RP1LP and Q-Box RP2LP packages).

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