Specifications

It is much easier to replace o-ring seals rather than sealant. With
sealant, it is necessary to eliminate all residue before re-applying
another seal. Always inspect o-rings for wear prior to use. Good o-
ring seals are critical to sensor performance for the following rea-
sons:
• To keep moisture out of the wiring pocket allowing the sensor
to withstand washdowns and autoclaving.
• To prevent the process from contaminating the sensor and
wiring.
• To seal the sensor securel
y into the port to prevent leakage.
4. Polish the Outer Body
The sensor is polished down to the base metal. Dirt, tarnish and
steam scorch marks are removed from the surface. The body of
the sensor is fabricated from 316L stainless steel to withstand
repeated exposure to both CIP and SIP conditions. Anything
less would allow pitting and corrosion of the metal over time.
The extra polishing step ensures the sensor is as clean as possi-
ble before returning it to service after the r
ebuild.
5. Replace Membrane Cartridge
The silicone membrane is reinforced with stain-
less steel mesh and can easily be damaged. Just
a bump on a hard surface can ruin its integrity.
Eventually it will become clogged, stretched or
damaged, so it should be changed regularly.
Inspection and calibration of the sensor will
determine when to change the cartridge.
Broadley-James has designed a membrane test-
ing kit to confirm that the membrane has not
been compromised prior to use. The
membrane
cartridge is replaced during rebuild service.
6. Refill Electrolyte Solution
It is recommended that the electrolyte be
changed after every run for the sensor to work
at optimum reliability. The surface of the cath-
ode assembly is ground to allow a thin layer of
electrolyte to be trapped between the mem-
brane and the glass. It is this solution which
completes the circuit of the sensor. The elec-
trolyte, along with the membrane, is replaced
during rebuild.
7. Provide Quality Assurance
Certificate and 1 -Year Warranty
As a final step, Broadley-James Corporation will
heat sterilize the sensor and test it to ensure it is
working correctly. A QA certificate is provided
which includes the date of rebuild and calibra-
tion results. The serial numbers of the sensor
and cathode are kept on file. This documenta-
tion will serve as the new warranty against man-
ufacturer’s defects in parts and workmanship.
Internal o-ring
seals sensor from
process media
316L
stainless steel
Silicone rubber
bladder to allow for
thermal expansion
of electrolyte
External o-ring
seals sensor
securely into port
RA32
electropolish
finish
Nickel/Teflon
coated threads to
prevent galling
(cutaway view)
Precisely ground glass
to allow thin, even
layer of electrolyte
solution to form under
membrane
Special conical
gasket to
position
cartr idge
Semipermeable
membrane
reinforced with
stainless steel mesh
tenance Maintenance Maintenance Maintenance Maintenance Ma
49
Broadley-James Corporation (U.S. & Canada) Toll-Free: 800-288-2833 E-mail: [e-mail]
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