Thermo Scientific VH-D20 Operating Manual page 129

Follow these steps
Charged Aerosol Detectors (VH-D20, VF-D20)
Operating Manual
On the gas port on the detector, disconnect the elbow connectors of the
gas tubes from the port.
To re-install the gas tubes or install new gas tubes, follow the steps in
Connecting the Gas Inlet and Exhaust Tubes
7 • Maintenance and Service
(} page 68).
Page 129