F-900 Instruction Manual rev. 1/16/2014
1554 NE 3
rd
Ave, Camas, WA 98607, USA Phone (360) 833-8835 Fax (360) 833-1914
[email protected] http://www.felixinstruments.com
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8.
Unscrew the sensor from the side panel. There is a screw on
either side of the sensor attaching the base of the sensor to the
side of the F-900 instrument housing.
9.
Finally, disconnect the wiring that clips onto the circuit board
from the sensor. This is an easy connection once you can access
it with the back panel flipped upwards.
10.
Lift the sensor out of the instrument.
11.
Weigh the sensor on an analytical balance and compare it with
the weight written on the sensor. Figure out the amount of
water that needs to be replaced by subtracting the current
sensor weight from the original sensor weight. ( 1g = 1 ml of
water)
12.
Fill the syringe with distilled water.
13.
Remove the red plug from the port. Insert the needle of the
syringe in the port.
14.
Inject water
SLOWLY
into the cell until the sensor returns to its original weight.
15.
Do not overfill the cell.
Water leaking out of the cell could be mixed with sulfuric acid.
16.
Dry any excess water from the outside of the
sensor before putting it back in the F-900.
17.
Allow the sensor at least 1 hour after refilling to
equilibrate. Then, turn the F-900 on and
resume measurements.
Note:
Weighing the entire F-900 unit on an analytical balance after the sensor has been refilled will
allow you to monitor the water level of the sensor, by keeping track of the weight loss of the whole
F-900 unit. Remember to always weigh the F-900 with the same setup and to follow the
instructions above to remove and refill the sensor, when it has lost 20-25 grams of water. High
humidity can add water to the sensor; overfilled sensors have been tested and do not cause a
problem.
