EUTECH INSTRUMENTS CON 6 (01) PDF Document

The large custom LCD on your EUTECH INSTRUMENTS CON 6 consists of 4-digit segments and several operation annunciators:

1. Primary display: Shows the main reading.

2. This indicator is available for the TDS 6 meter only.

3. milli-Siemens/cm (mS) or micro-Siemens/cm (µS) indicator: Available for the EUTECH INSTRUMENTS CON 6 meter.

4. Temperature indicator (°C).

5. Percentage indicator (%): For the Temperature Coefficient.

6. Low battery indicator (LO).

7. Hold (frozen) reading indicator (HO).

The EUTECH INSTRUMENTS CON 6 has a 6-key splash-proof keypad. The functions are as follows:

ON/OFF: Powers on and shuts off the meter. Takes you directly into measurement mode when the meter is switched on.

CAL:

• Enters into calibration mode for Conductivity and Temperature.

• Aborts a calibration or setup process without confirming any set value.

HOLD/ENTER:

• HOLD: Freezes the measured reading. To activate, press the HOLD key while in measurement mode. To release, press the HOLD key again.

• ENTER: Press to confirm values in calibration mode, and to confirm selections in SETUP mode.

▲ / ▼ Keys:

• In Calibration Mode: Press to scroll through calibration values.

• In Setup Mode: Press to scroll through the setup sub-group programs.

• Press the ▲ key during conductivity measurement mode to activate the manual ranging function. Each key press will move up to a higher conductivity range.

MODE:

• Selects measurement mode for conductivity and Temperature.

• When pressed together with the ON/OFF key, it will take you into the SETUP mode. This allows you to customize meter preferences.

To remove the meter from the rubber boot:

1. Ensure that the cables of the Conductivity electrode or temperature probe are not connected.

2. Push out from the bottom edges of the meter until it is completely out of the boot.

To insert the meter into the rubber boot:

1. Slide in from the top of the meter.

2. Push the bottom edges of the meter down to set it into position.

3. Lift up the stand at the back of the meter for bench top applications if necessary.

The battery compartment is located at the back of the instrument. A “LO” annunciator on the LCD alerts you when battery power is low.

Caution: Power off the meter when changing batteries.

1. Push the cover in the direction of the arrow and lift it up.

2. Note the polarity of the batteries and insert them into position.

3. After replacement, place the cover back on and press down until it locks tight.

The supplied conductivity electrode has a cell constant of K = 1.0 and a built-in temperature sensor for Automatic Temperature Compensation (ATC). For proper use, please note the following:

• Always immerse the probe beyond the upper steel band during measurements.

• DO NOT remove the protective plastic probe guard during measurement and calibration, as it may affect your readings.

• We recommend that you do not submerge the probe above the protective guard. The cable can be submerged for brief periods, but not continuously.

1. To connect the electrode, align the BNC connector slots with the posts of the meter’s socket and rotate the connector clockwise until it locks.

2. To remove the electrode, rotate the connector in an anti-clockwise direction until it unlocks, and slide the connector off the socket.

3. Insert the mini phono jack of the temperature sensor into the corresponding socket on the meter.

4. Unplug the phono jack when not in use or when you want to measure Conductivity without any temperature compensation (Manual Temperature Compensation).

CAUTION: Do not pull or force on the probe cord or the probe wires might disconnect.

NOTE: Keep connectors clean. Do not touch the connector with soiled hands.

When you press the ON/OFF key to power up your EUTECH INSTRUMENTS CON 6, it will go through a series of displays showing the various setup parameters:

1. The first screen shows [Con 6], which is the meter’s name.

2. The second screen shows [C 1.0], which is the conductivity cell constant, k. The default value is k=1.0.

3. The third screen shows [t 25.0 °C], which is the Normalization Temperature. The default value is 25 °C.

4. The fourth screen shows [t 2.1%], which is the Temperature Coefficient. The default value is 2.1 %/°C.

5. All LCD segments will light up for 2 seconds.

6. The meter will then change into measurement mode, and you are ready for conductivity measurement.

To switch between Conductivity measurement mode and Temperature measurement mode, simply press the MODE key. The customized annunciator (°C for temperature, µS/mS for conductivity) helps indicate which measurement parameter you are in.

Your EUTECH INSTRUMENTS CON 6 has five measuring ranges. You should calibrate each range using a solution that falls within the “recommended calibration solution range” for the highest accuracy.

When you recalibrate, old calibrations are replaced on a range-by-range basis. To completely recalibrate your meter, it is best to first clear all old calibration data by restoring factory defaults.

Before starting calibration, ensure you are in the correct measurement mode (Conductivity). For best results:

• Select a standard value close to the sample you are measuring, or one that is approximately 2/3 of the full-scale value of the measurement range. For example, use a 1413 µS solution for the 0 to 2000 µS range.

• Use new, fresh Conductivity standard solutions or sachets. Do not reuse standard solutions as they can become contaminated.

• Always rinse the probe with deionized water or a rinse solution before and after each calibration to avoid cross-contamination.

• Note that the meter is factory-set to a temperature coefficient of 2.1% per °C, which provides good results for most applications.

In the automatic calibration mode, the EUTECH INSTRUMENTS CON 6 automatically detects and verifies known calibration standards. The standards depend on the normalization temperature set in the meter.

Ensure your meter is in Automatic Calibration mode (see Advanced Setup). You must use one of the standard solutions listed for auto calibration.

1. If necessary, press the MODE key to select conductivity mode.

2. Rinse the probe thoroughly with de-ionized water, then rinse with a small amount of the calibration standard.

3. Dip the probe into the calibration standard, immersing the tip beyond the upper steel band. Stir gently and allow the reading to stabilize.

4. Press the CAL key to enter calibration mode. The [CA] indicator will appear, and a value will flash.

5. Wait for the value to stabilize and press the ENTER key. The calibration standard value will appear for 3 seconds. If successful, [donE] will be displayed for 3 seconds, and the meter will return to measurement mode.

6. To perform a multi-point calibration, repeat steps 1-5 for the next calibration point in a different range.

Important Notes:

• The meter allows a tolerance of ±40% of the standard. If your solution is outside this range, an “Err 1” message will appear.

• If the solution temperature is below 0 °C or above 50 °C, an “Err 2” message will appear.

In Manual Calibration mode, you can use customized calibration standards.

1. If necessary, press the MODE key to select conductivity mode.

2. Rinse the probe with de-ionized water, then rinse with a small amount of your calibration standard.

3. Dip the probe into the calibration standard, immersing the tip beyond the upper steel band. Stir gently and allow the reading to stabilize.

4. Press the CAL key to enter calibration mode. [CA] will appear, and a value will begin flashing.

5. Wait for the reading to stabilize, then press the ▲ or ▼ keys to adjust the flashing value to match your calibration standard.

6. Press the ENTER key. The [CO] indicator will appear for 1.5 seconds, and the meter will return to measurement mode.

7. For multi-point calibration, repeat steps 1-6 for the next range.

Calibrate the temperature sensor only if you suspect errors or have a replacement probe. You can offset the reading up to ±5 °C from the original default.

1. Make sure the temperature sensor’s phono jack is properly connected to the meter.

2. Switch on the meter and press the MODE key to select the temperature measurement mode.

3. Press the CAL key to start temperature calibration.

4. Dip the probe into a solution with a known temperature (e.g., a temperature bath). Allow time for the temperature to stabilize.

5. Wait for the value to stabilize, then press the ▲ or ▼ key to adjust the value to match the known solution temperature.

6. Press the ENTER key. The [CO] indicator will appear for 1.5 seconds, and the meter will return to measurement mode.

For Automatic Temperature Compensation (ATC), make sure the phono jack of the probe is securely inserted into the meter. The conductivity reading displayed will be automatically compensated for according to the normalization temperature (20 °C or 25 °C) selected in the advanced setup menu.

To use manual temperature compensation, you enter the temperature of your process into the meter. The reading will then be compensated to this value.

1. Unplug the probe’s phono jack (not the BNC) from the meter.

2. Switch on the meter and press the MODE key to select the temperature measurement mode.

3. Press the CAL key to start the temperature calibration process.

4. The “CA” indicator will appear, and a temperature value will start flashing.

5. Check the temperature of your sample with an accurate thermometer. Use the ▲ or ▼ key to adjust the flashing value on the meter to match the reference thermometer.

6. Press the ENTER key. The [CO] indicator will appear, and the meter will return to measurement mode. Your conductivity readings will now be manually compensated to the temperature you entered.

1. Rinse the probe with de-ionized or distilled water before use. To avoid sample contamination, rinse the probe with a small amount of your sample liquid.

2. Press ON to switch on the meter.

3. Dip the probe into the sample. Ensure the liquid level is above the upper steel band on the probe. Stir the probe gently.

4. Allow time for the reading to stabilize, then note the reading on the display.

By default, your EUTECH INSTRUMENTS CON 6 has an auto-ranging function. To manually select a specific range, press the ▲ key successively. Each press will move to the next higher range.

The five conductivity ranges are:

• 0 – 20.00 µS/cm

• 0 – 200.0 µS/cm

• 0 – 2000 µS/cm

• 0 – 20.00 mS/cm

• 0 – 200.0 mS/cm

NOTE: If the value of the solution you are measuring is higher than the selected range, [Or] will appear on the display. The meter resets to the Auto-ranging function once it is turned off.

The HOLD function lets you freeze the display for delayed observation.

1. To hold a measurement, press the HOLD key while in measurement mode. The [HO] annunciator will appear on the display.

2. To release the held value and continue taking measurements, press the HOLD key again.

NOTE: This meter shuts off automatically after 20 minutes of non-use. If the meter is shut off, the HOLD value will be lost.

The advanced setup mode lets you customize your meter’s preferences and defaults.

To enter advanced setup mode:

1. Make sure the meter is switched off.

2. Press the ON and MODE keys simultaneously, holding both for 2 seconds. Release the ON key first, then release the MODE key.

3. The [StUP] indicator will appear momentarily, followed by the first setup menu item.

To navigate the menu:

• Use the ▲ or ▼ keys to scroll through the different setup programs.

• Press ENTER to select a program and view its options.

• Press CAL at any time to exit the setup menu and return to measurement mode.

The following parameters can be customized in the Advanced Setup menu:

• CELC (Select Cell Constant): Choice of k = 0.1, 1.0, and 10.0. Default is 1.0.

• ACAL (Automatic Calibration): Select “Yes” for auto calibration or “no” for manual calibration. Default is “Yes”. (Available in CON 6 meter only).

• t.Co % (Temperature Coefficient): Adjust value from 0.0 to 3.0 %/°C. Default is 2.1 %/°C.

• t.nr °C (Normalization Temperature): Choice of either 20 °C or 25 °C. Default is 25 °C.

• S.P.CA (Single Point Calibration): Choice of “Yes” or “No”. “Yes” uses one calibration for all ranges; “No” allows multi-point calibration. Default is “Yes”.

• UrSt (User re-set to factory defaults): Choice of “Yes” or “No” to restore defaults. Default is “no”.

The cell included with your meter has a cell constant of K = 1.0. You should select the cell constant that matches your electrode for best results.

• Use K = 1.0 for midrange measurements.

• Use K = 10 for high range measurements (above 20 mS).

• Use K = 0.1 for low range measurements (below 20 µS).

To set the cell constant:

1. Enter the advanced setup menu.

2. Press the ▲ or ▼ key until [CELC] appears on the LCD. Press ENTER.

3. Press the ▲ or ▼ key to select either “1.0”, “0.1” or “10.0”.

4. Press ENTER to confirm the selection. The meter will return to the [CELC] menu display.

5. Press the ▲ or ▼ key to move to the next menu item or press CAL to exit to measurement mode.

1. Enter the advanced setup menu.

2. Press the ▲ or ▼ key until [ACAL] appears on the LCD. Press ENTER.

3. Press the ▲ or ▼ key to select either [Yes] for automatic calibration or [no] for manual calibration.

4. Press ENTER to confirm your selection. The meter will return to the [ACAL] menu display.

5. Press the ▲ or ▼ key to move to the next menu item or press CAL to exit to measurement mode.

The temperature coefficient is the amount of change in conductivity per degree of temperature, expressed as percent per °C. The meter default is 2.1%.

1. Enter the advanced setup menu.

2. Press the ▲ or ▼ key until [t.Co %] appears on the LCD. Press ENTER.

3. Press the ▲ or ▼ key to select a value between 0.0 to 3.0.

4. Press ENTER to confirm your selection. The meter will return to the [t.Co %] menu display.

5. Press the ▲ or ▼ key to move to the next menu item or press CAL to exit to measurement mode.

You can set the meter to normalize its conductivity measurements to a standard temperature of either 25 °C or 20 °C. The default is 25 °C.

1. Enter the advanced setup menu.

2. Press the ▲ or ▼ key until [t.nr °C] appears on the LCD. Press ENTER.

3. Press the ▲ or ▼ key to select either [25.0 °C] or [20.0 °C].

4. Press ENTER to confirm your selection. The meter will return to the [t.nr °C] menu display.

5. Press the ▲ or ▼ key to move to the next menu item or press CAL to exit to measurement mode.

Single-point calibration uses one conductivity calibration value for the entire 5 conductivity ranges. Selecting [no] (multi-point) allows you to perform a separate calibration for each conductivity range.

1. Enter the advanced setup menu.

2. Press the ▲ or ▼ key until [S.P.CA] appears on the LCD. Press ENTER.

3. Press the ▲ or ▼ key to select either [Yes] for single-point or [no] for multi-point calibration.

4. Press ENTER to confirm your selection. The meter will return to the [S.P.CA] menu display.

5. Press the ▲ or ▼ key to move to the next menu item or press CAL to exit to measurement mode.

This function resets all parameters to factory defaults, clearing all calibration data and any setup functions you have changed.

IMPORTANT: Once activated, this action is not reversible.

1. Enter the advanced setup menu.

2. Press the ▲ or ▼ key until [UrSt] appears on the LCD. Press ENTER.

3. Press the ▲ or ▼ key to select [Yes].

4. Press ENTER to confirm. The meter will erase all settings, go through its switch-on initialization sequence, and return to measurement mode with factory settings restored.

• Keep the conductivity probe clean. Rinse it twice and gently swirl it while taking readings.

• For best accuracy, soak a dry probe for at least 5 to 10 minutes before calibration.

• Rinse the probe with deionized or tap water before storing.

• Never scratch the bands with a hard substance or strike the probe against any hard surface.

• Do not immerse the probe in oily solutions. If it becomes contaminated, clean the electrode by stirring it in a mild detergent bath or isopropyl alcohol. Wipe the probe with a soft tissue, rinse thoroughly in tap water, then in deionized water. Recalibrate the meter after cleaning.

To remove the probe guard for cleaning:

1. Grip the yellow probe guard and twist it clockwise. The locking notch will release.

2. Slide the probe guard off the end of the probe.

NOTE: Remember to re-attach the probe guard before taking readings.

If there is power but no display, check the following:

Cause: Batteries not in place.

Solution: Check that batteries are in place and making good contact.

Cause: Batteries not in correct polarity (+ and – position).

Solution: Re-insert batteries with correct polarity.

Cause: Weak batteries.

Solution: Replace batteries.

Unstable readings can be caused by several factors:

Cause: Air bubbles in probe.

Solution: Tap the probe to remove bubbles.

Cause: Dirty probe.

Solution: Clean the probe and re-calibrate.

Cause: Probe not deep enough in the sample.

Solution: Make sure the sample entirely covers the probe sensors.

Cause: External noise pickup or induction caused by a nearby electric motor.

Solution: Move or switch off the interfering motor.

Cause: Broken probe.

Solution: Replace the probe.

A slow response is typically caused by a dirty or oily probe. To fix this, clean the probe according to the “Probe Care & Maintenance” instructions and recalibrate the meter.

If an error message appears, switching the meter off and on again may eliminate it.

• You only need one calibration for measurement throughout the entire range of the meter. If a range was not calibrated, the meter automatically uses the closest range that was calibrated. However, only ranges that were directly calibrated have maximum accuracy.

• If measuring in ranges near/greater than 20 mS or near/lower than 100 µS, calibrate the meter at least once a week to get the specified ±1% F.S. accuracy.

• If measuring in the mid-ranges and you wash the probe in deionized water and store it dry, calibrate at least once a month.

• Wet the probe for 10 minutes before calibrating or taking readings to saturate the probe surface and minimize drift.

• If you make measurements at extreme temperatures, calibrate at least once a week.

• Only use the specified conductivity probe for this meter, as it has a built-in temperature sensor required for ATC.

To determine the temperature coefficient of your sample solution, use this formula:

tc = 100 x (C_T2 – C_T1) / (C_T1(T₂ – 25) – C_T2(T₁ – 25))

Where:

• tc = Temperature coefficient

• C_T1 = Conductivity at Temp 1

• T₁ = Temp 1

• C_T2 = Conductivity at Temp 2

• T₂ = Temp 2

Procedure:

1. Immerse the probe into a sample of your solution and adjust the meter’s temperature coefficient to 0% (no compensation) in the Advanced Setup menu.

2. Wait for 5 minutes. Note T₁ and C_T1 (conductivity at T₁).

3. Condition the sample solution and probe to a temperature (T₂) that is about 5 °C to 10 °C different from T₁, and note the conductivity reading C_T2.

4. Calculate the temperature coefficient of your solution using the formula shown above.

5. Enter the temperature coefficient you calculated into the meter via the Advanced Setup menu.