Serinus 40 User Manual 2.2
6.4.3 DFU Replacement
1. Turn the analyser off and unplug from the power.
2. Remove the Kynar nut from the end of the DFU by turning it anti-clockwise (looking from the DFU
side).
3. Replace the DFU and ensure that the flow is in the correct direction (arrow should point towards
the Kynar nut).
4. Tighten the Kynar nut clockwise.
Figure 54 – DFU filter
6.4.4 Quick Leak Test
This procedure is designed to determine if the instrument pneumatics have a leak. This procedure is
used for diagnostics purposes during many troubleshooting activities. If the instrument passes this
check then no further leak checks are required, if it fails, a full leak check will be required.
Equipment Required
Source of vacuum (pump)
Swagelok ¼” blocker nuts
1. Enter Main Menu Service Menu Diagnostics Valve Menu and set valve sequencing to
Disabled. Then close all the valves in that menu.
2. Plug the Sample Port, Calibration Port and the Background Air Port (see Figure 55).
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