Xylem FL700 FLUORIDE METERS - Manual (Page 8)

FL700 V1.1 11/07 8
Maintenance
Battery Replacement
1. Twist off the battery compartment cover
2. Holding the battery housing in place with a finger, pull out the battery carrier using the two
small tabs
3. Replace the four (4) CR2032 batteries observing proper polarity
4. Replace the battery carrier, reattach the battery compartment cap and tighten securely
Electrode Replacement
1. To remove the electrode, first turn the instrument OFF and then unscrew and remove the
electrode retaining collar. (turn the collar counter-clockwise to remove)
2. Gently rock the electrode from side to side, pulling it away from the meter until it
disconnects
3. To attach an electrode, align the positioning “keys” on the electrode and the main body
housing and then carefully push the electrode into the meter socket until it is fully seated
4. Tighten the electrode retaining collar firmly enough to seal the electrode with the meter
Electrode Storage
1. The module and can be stored wet or dry. If stored dry it will be necessary to allow
approximately 15 minutes of soaking in a fluoride solution before the specified
performance can be achieved. It is recommended that the electrode be stored wet in the
last test solution used by the instrument (fluoride ion plus TISAB reagent).
2. The instrument will give an error code when the electrode can no longer be calibrated
3. If the instrument will not calibrate, clean the fluoride electrode surface with the Extech
cleaning paste and recalibrate the instrument. If the meter still does not calibrate, replace
the electrode.
Extech cleaning paste
Extech offers a unique cleaning procedure for the lanthanum fluoride crystal that removes any
coating from the surface of the crystal and dramatically increases response time. This is
available from Extech and a sample of this paste is shipped with the product.