Other Standards; Slope Adjustment; Measurement Mode; Electrode Storage - Extech Instruments ExStik FL700 User Manual

Other standards

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.

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.

Measurement Mode

1. Prepare 20ml of test solution by adding one TISAB reagent to the unknown sample.
Thoroughly wipe the end of the FL700. Wait for the tablet to dissolve and then mix thoroughly
before proceeding.
2. Rinse the end of the FL700 in your rinse solution or in distilled water, wipe dry.
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 ~35 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.

Electrode Storage

1. 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 module and can be stored 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.
The instrument will give an error code when the electrode can no longer be calibrated
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.
Units of Measure
The FL700 has 3 different units of measure. (ppm, mV, and mg/l).
To change the units of measure follow these steps:
1. Turn on the meter.
2. Press and Hold the MODE/HOLD button and it will cycle through the 3 different units of
measure (ppm, mV, mg/L).
3. Release the Mode/Hold button when the preferred unit is selected.
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