Idiomas disponibles
Idiomas disponibles
LoT 406 Sensor Series
6
Trouble-shooting
Problem
Air bubbles
inside elec-
trode tip
Air bubbles
on aperture
diaphragm;
Slope not
adjustable at
pH 4
The pH meter
shows unsta-
ble readings
Unusal mea-
sured values
7
Electrode specification
Designation
Order No.
pH measurement range
Temperature range
Reference system
Reference electrolyte
Diaphragm type
Plug-in connector type
Penetration depth
Diameter
Shaft
PBT = Polybutyleneterephthalate
8
Factors that shorten electrode life
– Dry storage
– pH < 2
– Prolonged immersion in organic solvents
– Storage in distilled or demineralized water
– Temperature fluctuations
9
Literature
– P ractice and theory of the pH measurement
20 606 1531-E
– A pplication pH Measurement in meat
52 000 455
– A pplication pH Measurement in cheese making
52 000 459
– A pplication pH Measurement in raw meat processing
52 000 467
© 04 / 2023 METTLER TOLEDO
Printed in Switzerland
Cause
Bubbles formed
while stored hor-
izontally
Temperature
fluctuations
Temperature set-
ting on pH meter
Buffer solution
is dirty or old
Electrode oily
or dirty
Electrode oily
or dirty
P roblems with
cable
pH meter, elec-
trode, cable
Remedy
– W ith tip pointing down, shake
the electrode with short flicking
movements (like a clinical ther-
mometer)
– S tore electrode in upright po-
sition
Place electrode in tap water at
40 °C until bubbles disappear
Make sure pH meter is set to the
buffer temperature
Fresh buffer solution
If heavily fouled, clean electrode
with ethanol / ether 1:1 or hand-
hot (40 °C) soap solution
If heavily fouled, clean electrode
with ethanol / ether 1:1 or hand-
hot (40 °C) soap solution
Check that cable is properly con-
nected, or change the cable
– C heck contacts at electrode / ca-
ble and cable / pH meter
– C heck cable or use a different
one
– C hange electrode and recali-
brate your pH meter
LoT406-M6-DXK-S7 / 25
10 406 3123
2 ... 11
0 ... 80 °C
Argenthal
Xerolyt
Aperture
S7
25 mm
6 mm
PBT (FDA approved)
LoT 406 Sensor Series
en
17
59 906 021 B
