Xylem FL700 FLUORIDE METERS - Manual (Page 5)

FL700 V1.1 11/07 5
Operation
Preparation for use
1. Remove the FL700, electrode module and sample cup from its box. Remove caps from
module
2. Fit the electrode module onto the end of the meter body, making sure that the slots line
up correctly, and tightly turn the module retaining ring to secure the assembly
3. Wipe the fluoride crystal and reference junction with a damp tissue (cleaning
techniques are addressed later in this guide)
Powering the FL700
The FL700 uses four (4) CR2032 lithium ion batteries. Press the ON/OFF button to turn
the meter on or off. If the batteries are weak, the ‘BAT’ indicator appears on the LCD. The
auto power off feature shuts the meter off automatically after approximately 12 minutes of
inactivity. The auto power off feature may be temporarily disabled for convenience or for
extended polarization time.
Power-On Diagnostics
1. When the meter is switched ON the LCD displays “SELF” and “CAL” while the meter
runs a diagnostic routine
2. During this time the meter is recalling the user calibration data, performing self
diagnostics & initializing the circuitry
3. When completed, the meter proceeds to the normal measurement mode
Calibration
The FL700 can be calibrated between 1.0 ppm and 10 ppm or between 0.5 and 5.0 ppm
Fluoride ion. The following calibration procedure assumes the normal 1.0 to 10 ppm range
has been chosen.
1. Prepare a 1 ppm fluoride standard and TISAB reagent, or use pre made mixed TISAB
and 1 ppm standard
2. Pour 15 – 20 mls of this standard solution into the sample cup
3. Rinse the end of the FL700 module in TISAB solution and wipe thoroughly with paper
tissue
4. Place the FL700 in the 1 ppm standard and switch the instrument ON using the
ON/OFF key. The instrument will now run its self-calibration
5. The instrument will enter the HOLD mode when stabilized in the 1 ppm solution
6. Press the CAL key; CAL will appear in the display followed by 0.5ppm and 5.0 ppm.
Continue holding until 1.0 ppm is shown. Release the CAL key. After the display stops
blinking the instrument will enter the HOLD mode
7. The instrument is now calibrated and ready for use. The circled L and H icons on the
display indicate that the low range (L) and high range (H) calibrations have been
completed
Calibration frequency
Calibrate the FL700 prior to each new measurement batch or if more than 12 hours has
elapsed since the last calibration.