19
Device configuration
2.2 Measuring Capillary and External Electrode
The
external electrode
(see Figure 5) is made of platinum, arranged before the measuring capillary,
so that it rotate freely and be pulled downwards when necessary.
The
measuring capillary
(see Figure 5) is made of highly resistant plastic. It is secured to the
sampling chamber cover by a cap nut. At the lower end of the capillary body, an artificial precious
stone is cast with the precision measuring pore. The measuring pore has a cylindrical geometry with
a diameter to length ratio of 1:1. The axial arrangement of the hole minimizes the risk of blockage
and prevents impurities from accumulating inside the capillary body.
To change the measuring capillary, first carefully rotate the external electrode forwards. Then re-
lease the cap nut and remove it with the measuring capillary by pulling downwards. To prevent the
measuring capillary becoming contaminated with grease and dust, avoid touching its lower end,
which is immersed in the sample.
To re-assemble, screw in the cap nut manually and do not use a tool! Ensure that the tube extending
inside the measuring capillary is not buckled or pinched during assembly. Carefully rotate the exter-
nal electrode, without bending, and return it to its original position. Ensure that the background is
monitored before commencing the measurement (see Chapter 3.4).
If you find it necessary to change the measuring capillaries several times in one day, store the un-
used ones in particle-free CASY ton.
Unused measuring capillaries must always be cleaned thoroughly before being stored. Dried resi-
dues in the measuring pore can result in subsequent blockages. This can be prevented by placing
the measuring capillaries in CASY clean and leaving overnight. The following day, flush the mea-
suring capillaries carefully using CASY clean and then flush repeatedly with distilled water. Blow
the fluid from the measuring capillaries and store in a clean place.
The measuring capillaries should be cleaned using only the
CASY clean
agent specified by
OLS
OMNI Life Science
. Other agents may destroy the measuring capillaries.
OLS OMNI Life Sci-
ence
is not liable for any damage caused by using alternative cleaning agents.
Measuring Capillary and External Electrode
