June 28, 2016, 715003956 Rev. C
Page 86
D.5 Connecting and disconnecting the external, source
exhaust valve assembly (KAB)
The following procedures apply to instruments fitted with the external, source exhaust valve
assembly (serial number suffix “KAB”).
See page 19 for guidance on identifying your QDa version and page 88 for details about replacing
the internal, source exhaust valve (serial number suffix “KAD”).
Replace the source exhaust valve annually, or when a source pressure test fails and all other
causes of failure have been investigated.
D.5.1 Connecting the external, source exhaust valve assembly (KAB)
Before powering-on the QDa Detector, you must connect the assembly.
Required material:
• Chemical-resistant, powder-free gloves
To connect the source exhaust valve assembly:
1. Connect the valve assembly to the instrument’s push-in source exhaust outlet (see the
figure of the rear configuration on page 87).
2. Connect the waste tubing to the valve assembly as follows:
• Connect the API tubing to the API gas connection.
• Connect the convoluted liquid waste tubing to the liquid drain port.
• Connect the exhaust tubing to either the front or rear source exhaust connection, to
suit your configuration.
Tip: To determine which configuration you are using, see the configuration figures on
page 87 through page 99).
3. Fit the unused exhaust connection with a blanking fitting.
4. Slide the cover onto the valve assembly, and secure it with the holding screw.
Requirement: Wear clean, chemical-resistant, powder-free gloves when connecting the
source exhaust valve assembly.
Notice: To prevent solvent leaks and resultant damage to the instrument, cut the
PTFE waste line to a length that ensures that the entire waste line, from the source
exhaust valve assembly to the exhaust-trap bottle, follows a continuous, downward
gradient, without loops or areas of compression.
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