PRODUCT INSTRUCTION SHEET
Page 3 of 8
Salt Bridge Removal and Replacement
1. Remove the salt bridge using an adjustable wrench or pliers
by turning counterclockwise. SEE FIG 5.
2. Pull up on salt bridge to remove. SEE FIG 6.
3. Flush out chamber with fresh standard cell buffer then refill
with standard cell buffer (refill solution) to level shown in FIG. 7
(below top thread).
4. Install new salt bridge by turning clockwise on hex of salt
bridge (OPPOSITE OF FIG5) DO NOT OVER-TIGHTEN. Make
sure o-ring is properly seated. The salt bridge will be slightly
below the body surface . See FIG. 6A.
FIG. 5
FIG. 6
14
mm
FIG. 7
Electrode Cleaning Tips:
Coating of an electrode’s measuring surface can lead to er-
roneous readings including shortened span and slow response
times. The type of coating determines the type of cleaning
technique.
Soak the sensor in a mild soap solution for 2-3 minutes. Using
a soft bristle brush, scrub the entire measuring end of the sen-
sor, taking care not to scratch the glass measuring electrode.
Rinse in clean, warm water. If the sensor is usually in a process
above 7 pH, it is advisable to soak it 4 - 5 minutes in a weak
acid solution (hydrochloric recommended). Place the sensor
back in the soap solution for 2 - 3 minutes. Rinse it in clean
warm water.
Hard Coatings should be chemically removed. The chemical
used to remove the coating should be the least harsh chemical
that dissolves the coating in one or two minutes and does not
attack the electrode’s materials of construction. For example,
a calcium carbonate coating might be removed with 5% HCl
(muriatic acid).
Do not keep electrode in acid for more than 5
minutes. Rinse with clean water after acid.
Oily or Organic Coatings are best removed with detergents
or an appropriate solvent that does not attack the electrode’s
materials of construction.
NOTE:
When using chemicals or solvents, care should be taken
and appropriate eye, face, hand, body and/or respiratory pro-
tection should be used.
Protein-based coatings are best removed with an enzyme-
based cleaner such as TERG-A-ZYME (www.alconox.com).
Abrading or sanding a pH electrode’s surface should never be
done.
O-ring
must be
seated in
groove
for proper
seal
install a little
below surface
FIG. 6A
O-ring
must be
wet before
installation
fill to bottom
thread only
14mm
Socket wrench
Form: InstructSD7000CD-06 [Rev: 2016-10-10]
