Liquisys M CCM223/253
Maintenance
Hauser
87
• Fibres, suspended substances
Water under pressure, poss. with surface-active agents.
• Light biological deposits
Water under pressure.
ORP electrodes:
Carefully clean the metal pins or surfaces mechanically.
After mechanical cleaning, the ORP sensor can require several hours conditioning time.
For this reason, check the calibration after a day.
Clogged diaphragms
can be cleaned mechanically (does not apply to Teflon diaphragms
and open ring junction electrodes):
• Use a small warding file.
• Only file in one direction.
Air bubbles in the electrode:
• Air bubbles can indicate incorrect mounting. For this reason check the orientation.
• The range 15° to 165° to the horizontal is allowed.
• Not permitted: horizontal installation or installation with the plug-in head pointing
downwards.
a0006203
Fig. 43:
Permitted installation angle of glass electrodes
Check for reference system reduction:
The inner metal lead of the reference system (Ag/AgCl) of a combination electrode or a
separate reference electrode is usually light-brown and matt. A silver-coloured reference
system is reduced and therefore defective. The cause is a current flowing through the
reference element.
Possible causes for the current flow:
• Incorrect operating mode of the measuring instrument (PML pin connected, but operating
mode without solution ground ("without PML") selected.
• Shunt in measuring cable (e. g. through humidity) between reference line and grounded
screen or PM line.
• Measuring instrument defective (shunt in reference input or entire input amplifier
downstream of PE).
> 15°
> 15°
Содержание Liquisys M CCM223
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