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1.3
Proper use and maintenance of the LabSen 803 Electrode
1.3.1 How to Use the Movable Sleeve
As shown on the right picture, reference solution flows out of the small
hole, seeps through the surface of movable sleeve. You may adjust
the degree of firmness when use. The looser the movable sleeve is,
the faster the reference solution’s flow speed is, meaning you will get
stabilized readings in a shorter time. Purified water and low ion
concentration solutions measurements require faster flow speed. The
electrode must be recalibrated after tightness adjustment.
To loosen the movable sleeve, push up the movable sleeve. If it is too
tight to push up, please refer to the right picture: insert the probe into the orange round tube (the
accessory comes with the probe), and press down the electrode with force, then the movable sleeve will
be loose. And then screw counter-clockwise to loosen the movable sleeve or clockwise to tighten it.
Please unplug the blue rubber plug on the refilling hole when adjusting the movable sleeve, this enables
the reference solution to flow out of the small hole; then slowly rotate and adjust the movable sleeve, so
that there will be no air remaining in the surface of the movable sleeve, which can greatly affect the correct
measurement.
1.3.2 Usage and Maintenance
a) Prior to measurement, remove the blue rubber plug to maintain proper air pressure of the reference
solution, keeping consistent flow rate of the reference solution and stable potentials of the junction.
Plug on the blue rubber plug after measurement.
b) After a period of usage, the reference solution will run low. Whenever the level falls to 1/2 height of the
electrode, add 3M KCL solution to the refilling hole with a syringe or pipette.
c) If reference solution is contaminated and needs replacement, unplug the blue rubber plug, loosen the
movable sleeve (see section 2), the reference solution will flow out quickly. Once the reference solution
runs out, use a syringe to add purified water through the refilling hole to rinse the electrode cavity; then
rinse again with 3M KCL to remove the remaining purified water; Tighten the movable sleeve, refill 3M
KCL solution with a syringe; then loosen the movable sleeve to let the solution flows out a bit, and
slowly twist it clockwise to tighten, so that air can be avoided in the surface of movable sleeve.
d) The connector of the electrode should be kept clean and dry. If contaminated, please clean it with
medical cotton and absolute alcohol and blow dry to prevent the short circuit of the electrode and slow
