Gc Interface; Gas & Flow - Markes International Unity 2 User Manual

 Markes H5-TD accessory.
 Connection to an external headspace autosampler (e.g. Agilent G1888 Headspace system).
Sequence Options – Post Tube Desorb Pressure Release Time
Pressure can be released from a sample tube prior to completion of desorption. This reduces the potential
loss of adsorbent from a pressurised tube, particularly if the tube has no gauze fitted to restrain the
adsorbent, as it is removed from UNITY 2 flow path. sets the time taken to release the carrier gas pressure
in the tube at the end of tube desorption. The default is 0.3 min.
Enable extended standby
In extended standby the Peltier coolers will be switched off. When enabled the time-out period before
which extended standby is entered can be set.
NOTE: The time-out period only starts once the instrument has entered standby.

3.4.2 GC Interface

Used to set the GC Interface logic.
The GC Interface logic is set to reflect whether the GC sense is Open or Closed for both GC Start (Out) and
GC Ready (In) i.e. for the particular GC being used is the contact Open or Closed to reflect a Start signal,
and Open or Closed to reflect a Ready signal. This information is usually provided in the GC Users Manual.
3.4.3 Gas & Flow
This page contains all settings for the carrier gas and mass flow controllers. If an MFC has been installed
on UNITY 2 it is configured under the Flow Control section of this page. For further information please
refer the MFC installation manual.
Markes International Ltd
T: +44 (0)1443 230935 F: +44 (0)1443 231531 E: enquiries@markes.com
www.markes.com
QUI-1057
Page 32