Refilling or Replacing the Measurement Sensors
c. Fit a needle to the fill solution container, rinse out the sensor
body with a few drops of fill solution and refill the sensor almost
full, leaving a small bubble at the top. Tap the sensor during
filling to dislodge air bubbles.
d. Replace the inner electrode - screw down tightly. Be careful not
to cross-thread the electrode. Shake the sensor down like a
thermometer to dislodge air bubbles at the sensor capillary.
Figure 3-18. Refilling the pH Sensor
e. Wipe the sensor with dry, lint-free tissue and check that the ‘O’ ring
is in position on the lefthand side, and is in good condition.
6. Tap the sensor to release any trapped air bubbles.
7. Install the sensor top first, aligning the sensor contacts. Press the
bottom of the sensor into position. Gently release the tensioner and
push it firmly home to make a good seal. Lower the block door,
snapping it into place. Lower the front cover.
8. Press * to restart the 248 system. The 248 calibrates on return to
the Ready screen.
NOTE: Siemens recommends that you use the condition routine after
refilling or replacing a pH sensor. If a new sensor is installed we
recommend waiting up to 90 minutes for the system to stabilize. If you
want to use the system during this settling in time frequent
calibrations are necessary. Running 10 QC samples before use will
promote stability.
Page 3-18 248 Operator’s Manual
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