Extech FL700 Operating Manual

User Guide

ExStik® FL700

Fluoride Meter

Introduction

The model FL700 is a system specifically designed for the quick and accurate measurement
of fluoride ions in drinking water and other aqueous samples. Unlike other electrode based
systems the FL700 consists of the sensing electrode, measuring electronics, and the display
in one convenient package. This meter is shipped fully tested; with proper use, this
instrument will provide years of reliable service.

Features

 Automatic temperature compensation (±10
 Automatic calibration
 Stability sensing to optimize accuracy
 Internal Datalogger for storing up to 25 readings
 Direct reading of ppm units
 Direct reading of relative mV units
 Automatic shut down after 12 minutes to preserve battery life
 Internal error detection

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C of calibration temperature)

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FL700 V1.1 11/07

Description

Meter Description

1. Battery compartment cover

2. LCD Display

3. MODE/HOLD button

4. CAL/RECALL button

5. ON/OFF button

6. Electrode Retaining Collar (ring)

7. Electrode Sensor
(Note: The Electrode storage cap is not shown this diagram)

Electrode Sensor Description

The sensing electrode is a europium doped lanthanum fluoride single
crystal that has been incorporated into a removable sensing module that
houses a reference electrode and temperature measurement system. The
high resistance electrode signals are impedance converted to a low resistance output in the
sensing module to ensure stable and noise free performance.

Reagent Tablets

The FL700 allows the users to follow the ASTM and EPA standard methodology using any
of the TISAB reagents and standards already in use. Also, Extech has developed tablet-form
TISAB which contains all of the essential and approved chemicals that are found in the
usual TISAB reagents.

The “dry” reagent does not contribute to sample dilution. The benefits of this method are:

1. No volumetric errors

2. Independent of sample size (± 20% of nominal sample volume)

3. Easy to use in the field or laboratory

4. Can be shipped more easily than liquid reagents

5. Lower cost per test

LCD Display

1. Bargraph display

2. Measurement units

3. Main display

4. Low (L) and High (H) Calibration icons

5. Data HOLD indicator

6. Low Battery indicator

7. Temperature display

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FL700 V1.1 11/07

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