HACH LANGE astroTOC UV Manuel D'utilisation De Base page 33

Figure 17 Clean the IR cell
1 Sapphire window
2 IR mirror assembly
Pressure/leak test
Electrocution hazard. Remove all power from the instrument and relay connections before this
maintenance task is started.
If relay contacts are connected to AC line voltage, remove the main power to the analyzer before the top
enclosure door is opened.
Do a pressure/leak test to make sure that the O-rings are correctly installed and have sealed the IR
cell assembly.
1. Remove the outlet tube from the IR cell assembly and plug the outlet tube.
2. Monitor the bubbles in the GLS U-tube. If the bubbles travel consistently from front to back, the
cell O-rings give a sufficient seal.
Note: Failure of this test may also indicate a cracked condenser or leaky GLS fitting.
3 O-ring (between IR bench and mirror assemblies)
4 IR bench assembly
D A N G E R
C A U T I O N
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