Xylem FL700 FLUORIDE METERS User Manual
Page 6
FL700 V1.1 11/07
6
Slope Adjustment
1. Slope adjustment although not a frequent requirement can be carried out by following the
instructions in Calibration steps above except for the fact that a 10 ppm standard is used
after calibrating with the 1 ppm standard
2. Press the Cal button until 10 ppm appears. Slope adjustment is then complete
Other standards
As mentioned the FL700 can also be calibrated between 0.5 and 5.0 ppm F. Follow the
calibration instructions above but substitute 0.5 ppm for 1.0 ppm and 5.0 ppm for 10 ppm.
Measurements
1.
Prepare an unknown solution by adding TISAB reagent to the sample in the same dilution
ratio as for the calibration procedure. Mix thoroughly
2.
Rinse the end of the FL700
3.
Place the FL700 into the prepared unknown sample. If the instrument is in the HOLD
mode, press MODE/HOLD to unlock HOLD
4.
After 25 seconds, the instrument will display the value of the unknown concentration and
will then enter the HOLD mode
Note: The readings can be stored in the memory by pressing the MODE/HOLD key for ~ 3
seconds as explained in a subsequent section of this user guide.
Temperature Units (ºF / ºC)
1.
With the unit OFF, press and hold the CAL/RECALL button
2. With
the
CAL/RECALL button depressed, momentarily press the ON/OFF button to turn
the unit ON
3. The
CAL/RECALL button can be released when ‘Self Cal’ is shown in the display
4.
To switch back to the previous unit of measure, repeat steps 1 through 3.
Auto-Power OFF Feature
The auto power off feature automatically shuts the meter off 12 minutes after the most recent
button press.
Disabling the Auto-Power OFF Feature
With the unit ON, momentarily press the CAL/RECALL button, then quickly press and hold
both the MODE/HOLD and ON/OFF buttons until ‘oFF’ is displayed. To restore the Auto Power
Off Feature (auto power OFF enable) simply turn the meter off and on again using the ON/OFF
button.
Low Battery Indication
When the battery voltage falls below the operating threshold, ‘BAT’ will appear on the display.
Refer to the Maintenance section for battery replacement information.