Cleaning or Exchanging the Holmium Oxide Filter

When

If holmium oxide filter is contaminated

Tools required

Qty.		p/n	Description
1			Screwdriver, Pozidriv #1 PT3
1			Screwdriver, flat blade
2			Wrench, 1/4 inch for capillary connections
2			Pair of tweezers

Parts required

Qty.		p/n	Description
1		79880-22711	Holmium oxide filter

Prerequisites

Turn the lamp(s) off.
Open the doors of the module.
Remove the flow cell, see Remove and Install a Flow Cell.

NOTE

The glass tends to build a film on its surface even under normal environmental conditions. This is a phenomenon, which can be found also on the surface of several other glasses and has something to do with the composition of the glass. There is no indication, that the film has an influence on the measurement. Even in the case of a thick film, which scatters the light remarkably, no shift of the peak positions is to be expected. A slight change in the absorbance might be possible. Other components within the light path (lenses, windows, ...) are also changing their behavior over the time.

NOTE
Do not scratch the holmium oxide filter.
The holmium oxide filter can be cleaned with alcohol and a lint-free cloth.
NOTE
The holmium oxide filter can be cleaned with alcohol and a lint-free cloth.
Perform a holmium oxide test (see Holmium Oxide Test) to check the proper function of the holmium oxide filter.
Install the flow cell, see Remove and Install a Flow Cell.
Turn on the flow.

21-Jun-2025