407303 Datasheet, PDF (4/6 Pages) Extech Instruments Corporation. – Heavy Duty Conductivity / Temperature

Operation
Connecting the Sensor
1. Remove the protective sheath from the sensor tip before use. Retain the sheath for
sensor storage.
2. The sensor connects to the input jack at the top of the meter. The sensor jack is keyed,
thereby allowing the sensor plug to be inserted from only one direction. Line up the
plug with the jack before firmly inserting the sensor. Avoid undue force; forcing the
sensor into the jack may bend the pins in the sensor plug.
Powering the meter
1. Press the POWER button to turn the meter ON or OFF. If the meter does not switch on
when the POWER button is pressed, check the battery. Refer to the battery installation
and replacement section later in this manual.
2. This meter is equipped with an Automatic Power OFF feature. To conserve battery
energy, the meter shuts off after 10 minutes. To defeat this feature, press the
RECORD button to access the Record/Recall mode. In the Record/Recall mode, the
meter will remain on until the user turns it off or until the battery weakens.
LCD Contrast Adjustment
It may be necessary to adjust the display contrast due to a change in viewing angle or
voltage drift. Use the LCD Contrast adjustment wheel located on the right side of the meter
to set the preferred contrast.
Taking Measurements and using the RANGE select slide switch
1. Insert the sensor tip into the solution under test.
2. The conductivity and temperature readings will appear on the LCD. Conductivity
measurements appear at the center of the LCD. Temperature readings appear on the
bottom of the LCD in smaller digits.
3. Allow time for the measurements to stabilize. The LCD display digits will settle after a
short stabilization period.
4. If dashes appear on the top of the LCD measurement area, the reading is over range.
Slide the RANGE select switch to a higher range. If dashes appear on the bottom of
the measurement display area, the reading is under range. Slide the RANGE switch to
a lower range.
Selecting ^oC/^oF units of measure
Press the ^oC/^oF button to select the Temperature unit of measure. The display will reflect
the currently selected unit of measure.
Temperature Compensation using the FACTOR ADJ and TEMP buttons
This meter has a user adjustable temperature compensation feature that accommodates a
change in conductivity due to a change in solution temperature. The default compensation
is 2% and applies to most common standard salt solutions. Other solutions have known
temperature coefficients and the temperature adjustment allows the user to set it to match
the solution. To change the coefficient:
1. Set the meter to the 200µS range via the RANGE slide switch
2. Press the TEMP button
3. Press the Factor Adjust button to select the desired compensation factor (in increments
of 0.1% per degree C). The display will show the factor as it is adjusted.
4. Once the desired factor is set, press the TEMP button.
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407303 V3.1 01/06