Vaisala GMP343 User Manual download pdf (Page 72)

User’s Guide ______________________________________________________________________

70 ___________________________________________________________________M210514EN-E

Changing the Filter and Cleaning the Optics

(Diffusion Model Only)

The optics of the diffusion model are well protected by the filter, and it can

tolerate some dirt on the optics as the measurement is compensated for the

reduction of signal. For this reason, there is typically no reason to perform

any cleaning actions even if the probe appears slightly dirty on the outside.

If the filter is very contaminated, or if the probe gives the error code E07

Measurement signal level too low, follow the procedure below to change

the filter, and if necessary, clean the optical surfaces. A new standard

diffusion filter and filter cover can be ordered from Vaisala (order code

GMP343FILTER).

1. Rotate and remove the filter cover.

2. Take a firm hold on the frame of the diffusion filter, and pull it out.

Note that the threads for the filter cover are sharp.

Figure 10 Opening the Diffusion Filter

CAUTION

Do not clean the optical surfaces in any other manner. If further cleaning

is required to restore error-free measurement, contact Vaisala Service.

NOTE

Handle the diffusion filter carefully to prevent contaminants or

mechanical stress from damaging the filtering surface.

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Vaisala GMP343 User Manual Page 72