Extech Instruments EC170 User Manual page 6

Measurement Preparations, Notes, and Considerations
 Accuracy is given as % full‐scale; therefore using the lowest range will yield the best
accuracy.
 The meter's display will indicate E02 or E03 if the measured value is below (E02) or above
(E03) specified limits of the meter. If this occurs, please select another range as described in
the Manual Range discussion in previous paragraph.
 The temperature coefficient is fixed and cannot be adjusted.
 The normalization (reference) temperature is fixed (25
most applications.
 Rinse the probe with deionized or distilled water before use to remove impurities that may
adhere to the electrode. When the meter has been idle for a long period, soak the electrode
for at least 30 minutes before use.
 When dipping the probe into a sample solution, be sure to eliminate air bubbles trapped in
the probe's slot. To remove air bubbles, give the probe a gentle stir while submerged in the
solution.
 When taking a measurement, stir the probe gently in the sample to create a homogenous
sample. Allow a few seconds to elapse for the probe and the sample to reach temperature
equilibrium. Ideally, wait 15 minutes to achieve maximum accuracy and best temperature
compensation.
 The unit of measure icon will flash on the meter's display while stabilization is taking place in
measurement mode. When stabilization is achieved, the meter's icon will stop flashing.
 Press the HOLD button to freeze a displayed reading. Press again to release the display.
Salinity Measurement
1. Read the Measurement Preparation section above before continuing.
2. Insert the electrode into the sample ensuring that the electrodes are completely submersed.
3. Slowly stir the solution with the electrode to remove air bubbles.
4. The meter uses the Auto‐range utility to find the proper range and then displays the salinity
reading at the center of the LCD with the temperature reading shown on the lower LCD area
in smaller digits.
Finishing a Measurement Session
After a measurement session:
 Rinse the electrode in deionized or distilled water and store dry.
 Affix the protective cap over the electrode when storing.
 If the unit is to be left un‐unused for long periods, remove and store the batteries separately.
Automatic Power OFF (Sleep mode)
The meter will automatically switch OFF after 20 minutes of inactivity. To disable the Sleep
Mode: With the instrument switched off, press and hold the SET and HLD/CAL buttons
simultaneously until the 'n' icon appears on the display. Release the buttons and the meter will
power up. The meter will now stay switched ON until the user manually switches it OFF. The
meter reverts to the 'Sleep Mode active' state each time it is powered down.
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