Extech Instruments EC600, pH300 User Manual

User's Guide

Digital Conductivity / pH Meter

Model EC600

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Introduction

Congratulations on your purchase of the Extech Conductivity / pH meter. For best

results, please read the entire manual before use.

The EC600 meter measures Conductivity, pH, and temperature parameters.
Conductivity measurements also yield TDS (total dissolved solids), Salinity, and
Resistivity readings.

The built-in microprocessor provides automatic calibration, automatic temperature
compensation, data storage, and self-diagnostics. The meter can recognize up to 13
types of pH standard buffer solutions and 8 types of Conductivity standards.

The meter’s digital filter improves measurement speed and accuracy.

Two special modes (for distilled water and distilled water mixed with ammonia) are
provided.

The meter offers a backlit LCD display and is dust-proof and water-proof, meeting the
IP57 rating

This meter is shipped fully tested and calibrated and, with proper use, will provide years
of reliable service.

Supplied Equipment List

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• EC6000 Meter

• Conductivity and pH Electrodes

• Standard pH buffer solutions (4.00pH, 7.00pH, and 10.01pH) / 50ml

• Standard Conductivity solution (1413µS/cm) / 50ml

• Screwdriver (for removing battery compartment)

• Batteries (2 x ’AA’ 1.5V)

• User’s Guide

• Carrying Case

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EC600 V2.0 4/10

Meter Description

1. LCD Display (detailed in section below)

2. Rubber protective jacket (remove to access the rear battery compartment)

3. Keypad (detailed in section below)

4. Electrode connection jack

5. Electrode plug

6. Electrode cable

Display Description

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1. Measurement type icon

2. Measured reading

3. 888 (Stored data serial number), M+ (measurement to be stored icon), RM (reading to
be recalled icon)

4. Units of measure

5. Temperature reading

6. Stable measurement icon

7. Calibration icons

8. Low battery icon

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EC600 V2.0 4/10

Keypad Description

The meter has five (5) front panel function keys:

ON/OFF Power Key

Calibration Key:

a) When taking a measurement, press this key to enter the calibration mode
b) When in the programming mode, press this key to change the displayed

number or the ON/OFF state

Function Key

a) In pH measuring mode, one short press switches between pH and mV

measuring modes. One long press (>2s) enters the parameter setting mode.
Subsequent presses will scroll through the available parameters.

b) In other measuring modes, press and hold to enter the parameter setting

modes. The meter will scroll through the available parameters

Backlight and ENTER Key

a) In the measurement mode, momentary presses toggle the backlight on and off
b) When in the programming or calibration mode, press to ENTER data
c) When in the pH mode, press and hold to change the resolution in the range of

0.01 to 0.1pH

d) When in the Conductivity mode, press and hold to scroll through the TDS,

Salinity, Resistivity, and Conductivity modes

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MEMORY STORE and RECALL Key

a) In the measurement mode, momentary presses store the displayed readings.

Press and hold for at least 2 seconds to recall a saved reading

b) In programming mode, press to change the displayed number or ON/OFF state

Store, Recall, and Clear Datalogger Memory

STORE Readings

The meter can store up to 100 pH, 100 mV, and 100 Conductivity readings for a total of
300 data points. To store a reading, wait until the reading stabilizes (the smiling face icon

appears when the reading stabilizes). Press the M+/RM key momentarily to store a

reading. The M+ icon appears and the data point serial number increments.

RECALL Readings

In the measurement mode, press the M+/RM key to recall the most recently stored
reading. RM and the data point serial number for the displayed reading will appear on the
LCD. The measurement information will appear on the lower right hand side of the LCD.
Use the CAL or M+/RM buttons to scroll the remaining stored readings. Press the ENTER
key to return to the normal measurement mode.

CLEAR Readings

From the RECALL mode, press and hold the ENTER key for at least five (5) seconds. The
LCD display will show ‘CLR’ indicating that all of the stored readings have been erased.

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EC600 V2.0 4/10

The unit will automatically return to the normal measurement mode after approximately 2
seconds.

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EC600 V2.0 4/10

pH Measurement Mode

Preparation for Measurement

1. Turn the meter ON using the power key

2. Connect the pH electrode to the meter and the pH mode will automaticaly be selected.

3. Unscrew the protective cap on the probe jack located on the bottom of the meter (store
the protective cap in the carrying case for later use)

4. Carefully connect the pH probe to the meter’s probe jack. The probe can only be
inserted in one orientation. Once it is firmly connected, screw the probe collar onto the
meter to secure the probe

3-Point Calibration (7.00pH, 4.00pH and 10.01pH)

1. Press the CAL key to enter the Calibration mode. The meter’s display will show a
blinking ‘C1’

2. Rinse the probe in distilled water, allow it to air dry, and submerge it into a pH 7.00
buffer solution. Stir the solution briefly and allow it to stay in the buffer solution until a
stable reading is reached

3. Press CAL again and the display will show a blinking ‘7.00’

4. This portion of the calibration procedure is complete when the display stops blinking
and shows the ‘C2’ icon. The unit will automatically switch to the second point of the
calibration

5. Rinse the probe in distilled water again, allow it to dry, and submerge it into a pH 4.00
buffer solution. Stir the solution briefly and allow it to stay in the buffer solution until a
stable reading is reached

6. Press CAL again and the display will show a blinking ‘4.00’

7. This portion of the calibration procedure is complete when the display stops blinking
and shows the ‘C3’ icon. The unit will automatically switch to the third point of the
calibration

8. Rinse the probe in distilled water again, allow it to dry, and submerge it into a pH 10.01
buffer solution. Stir the solution briefly and allow it to stay in the buffer solution until a
stable reading is reached

9. Press CAL again and the display will show a blinking ‘10.01’

10. After the display stabilizes the 3-point calibration icon will appear

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1-Point and 2-Point Calibration

Note that the user can calibrate one or two points only, if the expected measurement is
known.

For example, if the expeced pH is 4pH, it is acceptable to perform only a 1-Point
Calibration (4pH). If the expected measurement is between 4.00pH and 7.00pH, the user
can perform a 2-Point Calibration (4.00 and 7.00pH), and so on.

For a 4pH calibration, only the circled L will appear on the LCD. For a 7.00pH, only the
circled M will appear on the LCD. For a 10.01pH Calibration, only the circled H will appear
(Low, Medium, and High).

Note: Use the ENTER key to exit the Calibration mode and return to the normal
measurement mode when performing 1 or 2 point calibrations.

For all other applications, a 3-Point Calibration is recommended. Always perform a 3-Point
Calibration on new probes and probes that have been in use for long periods. This
maximizes measurement slope linearity.

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