Sentec SDM, Service Manual

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3 Maintenance/Safety & Functionality Tests
SenTec Digital Monitoring System 17
CAUTION: Do not leave the sensor without membrane in air.
Perform the following steps uninterrupted.
2. Immerse the sensor into clean, room temperature tap water for 3 minutes.
3. Use a soft brush to completely remove dried up gel / electrolyte residues from
the grooves on the sensor circumference.
4. Softly rinse the sensor with clean tap water.
5. Tap the sensor dry using a clean lint-free towel. Pay attention not to touch the
ring and the pH-glass in the center of the sensor surface. Do not rub the sensor
surface!
6. Inspect the ring around the pH-glass for damages and brownish color (
see
Figure 4 Top view of the V-Sign™ Sensor). Note that the same criteria apply
for the OxiVenT™ Sensor.
If the ring around the pH-glass is broken, parts of it are missing, the brown color is
lost, or the ring has a metallic luster, then replace the sensor with a new SenTec TC
Sensor.
The sensor has an intact brown ring around the
pH-glass. The ring around the pH-glass is intact but has a
metallic luster, this sensor needs to be replaced
Figure 4 Top view of the V-Sign™ Sensor
7. Inspect the sensor to ensure that the grooves on the sensor circumference are
clean and intact. If the grooves on the sensor circumference are damaged
replace the sensor with a new SenTec TC Sensor.
8. OxiVenT™ Sensor only: Verify that the white oxygen sensing spot (i.e. off-
centered, white, circular spot) is present and intact.
9. If the visual inspections (steps 6 to 8) passed remembrane the sensor using the
Membrane Changer (for instructions please refer to the Directions for Use of the
Membrane Changer).
10. After placing a new membrane, verify that
a) the membrane ring is intact and securely seated on the sensor.
b) there are no air bubbles between membrane and sensor surface.