Metrohm Multi-Mode Electrode pro - Manual (Page 36)

5.1 Small maintenance
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6.1246.120 Multi-Mode-Electrode pro
4 Replacing the needle
Note
Do not touch the needle with bare hands!
Each needle is individually wrapped.
￭ Pull the old needle out of the membrane of the needle holder.
￭ Cut open the wrapper of the new needle with the scissors and
unwrap the white plastic part only. Do not yet completely remove
the wrapper.
￭ Insert the needle into the hole of the membrane and press in as
far as the white marking. Now, remove the wrapper.
5 Inserting the needle holder
￭ Insert the needle holder with the new needle into the MME pro.
Press in as far as it will go.
6 Removing the mounting ring
￭ Remove the mounting ring turning it counterclockwise.
7 Fastening the needle holder
￭ Use the wrench to tighten the needle holder by turning it clock-
wise until the black sealing ring becomes visible in the electrode
body.
See also the video Replace the needle in the multimedia guide Electrodes
in Voltammetry.
5.1.5 Adjusting the needle valve
Adjusting the needle valve
Before you can adjust the needle valve, the following requirements must
be fulfilled:
￭ The MME pro is mounted onto the measuring head of the instrument
and the inert gas supply is connected.
￭ An empty measuring vessel is placed beneath the MME pro.
￭ The instrument is connected to a PC on which the 797 VA Computrace
software is installed and running.