eutech-instruments alpha ph differential probe Manual Do Utilizador
Instruction
manuals
ECFP21A1A1
13
4.2. pH Sensor Refurbishment - Replacing the Salt Bridge and Reference Solution
4.2.1. If the sensor head has been cleaned
(see section 4.1.2) and calibration cannot
be achieved, replace the salt bridge and
be achieved, replace the salt bridge and
reference solution.
4.2.2. Hold the sensor firmly with the electrode
tip facing upwards. Remove the existing
salt bridge by using a 15/16 wrench
salt bridge by using a 15/16 wrench
(24mm) and turning it counterclockwise.
Dispose of the salt bridge using an
Dispose of the salt bridge using an
approved method.
4.2.3. Pour out the old reference solution.
Rinse the reservoir with distilled or de-
ionized water.
4.2.4. Slowly fill the reservoir with reference
solution so the solution just covers the
reference O-ring.
reference O-ring.
4.2.5. Slowly screw the new salt bridge clockwise onto
the sensor head until secure. Tighten the salt
bridge with a 15/16 wrench (24mm) until snug.
bridge with a 15/16 wrench (24mm) until snug.
Do not over tighten.
Maximum torque: 10 lbs
Maximum torque: 10 lbs
⋅in (1.13 N⋅m)
4.2.6. After replacing the salt bridge and reference
solution, calibrate the sensor according to the
instructions in the Alpha pH2000D controller
instructions in the Alpha pH2000D controller
manual.
If after cleaning and refurbishment sensors still have slow responses, low measurement
slopes or are seriously abraded or scratched they must be replaced.
slopes or are seriously abraded or scratched they must be replaced.
Do not over fill. Overfilling will
lead to excessive pressures that
will affect the junction potentials of
will affect the junction potentials of
the reference.
Figure 4.1: Replacing the salt bridge
and reference solution