Thermo Scientific AquaSensors
™
AnalogPlus
™
Dissolved Oxygen Sensor (ppm) User Guide
22
4.2.
D. O. Sensor Refurbishment - Replacing the Membrane Cap and Electrolyte
4.2.1.
If the sensor head has been cleaned
(see section 4.1.2) and calibration cannot
be achieved, replace the membrane cap
and electrolyte solution.
Figure 4.1: Replacing the membrane
cap and electrolyte.
4.2.2.
Hold the sensor firmly with the electrode
tip facing down. Remove the existing
membrane cap by turning it
counterclockwise. Dispose of the old
membrane cap and electrolyte using an
approved method.
4.2.3.
Slowly fill the new membrane cap with
D.O. electrolyte and gently agitate to
remove trapped bubbles.
4.2.4.
Place the sensor head into the filled
membrane cap.
Install slowly. Screwing on the
new membrane cap quickly may
cause pressurization of the
membrane.
4.2.5.
Slowly screw the new filled membrane cap
clockwise onto the sensor head until secure.
Excess electrolyte will be expelled.
Do not over tighten.
Maximum torque: 10 lbs
⋅
in (1.13 N
⋅
m)
4.2.6.
After replacing the membrane cap and
electrolyte, calibrate the sensor according to the
instructions in the AV88 analyzer manual.
