Triplett WQ120 Bedienungsanleitung

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User Manual

WQ120

pH / Conductivity / TDS / Salinity / Temperature Meter

5 Commonwealth Ave

Woburn, MA 01801

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

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Introduction

Thank you for selecting the Triplett WQ120 pH/Conductivity/Total

Dissolved Solids (TDS) / Salinity meter. With the WQ120’s dynamic cell-

constant technology it is possible to measure a wide range of

Conductivity, TDS, and Salinity with the same electrode. Careful use and

maintenance provide years of reliable service.

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Description

METER DESCRIPTION

1. Battery compartment cap

2. LCD Display

3. MODE / HOLD button

4. CAL / RECALL button

5. ON/OFF button

6. Electrode collar

7. pH/Conductivity Electrode

LCD DISPLAY

1. Bar graph reading

2. Measurement Units

3. Main Display

4. RENEW Indicator

5. HOLD Indicator

6. RANGE Calibration

Indicator

7. Low Battery Indicator

8. Temperature Display

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Powering On

The WQ120 uses four (4) CR2032 Lithium Ion Batteries (included). If the

batteries are weak, the ‘Low Battery’ indicator appears on the LCD.

Press the ON/OFF key to turn the WQ120 on or off. The auto power off

feature shuts the WQ120 off automatically after 10 minutes of inactivity

to preserve battery life.

Getting Started

 Remove the cap from the bottom of the WQ120 to expose the

pH electrode, reference junction and conductivity electrodes.

 Before the first use or after storage, soak the electrode in tap

water or pH 4 buffer solution for about 10 minutes.

 White KCL crystals may be present in the cap or on the

electrode. This is to be expected depending on the length of time

in storage. These crystals will dissolve while soaking the

electrode or they can be rinsed away with tap water.

 For best results calibrate with pH 7 buffer solution first, then

calibrate with the buffer solution closest to the expected pH

value of the solution or material to be tested.

 To preserve the pH electrode life, keep the sponge in the

protective cap soaked with tap water or pH 4 buffer solution.

 For best results, calibrate for conductivity with a standard in the

expected range of the sample. For maximum accuracy calibrate from

low conductivity value standards to high value standards.

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Measurement Procedure

Sample Preparation:

1. For Conductivity, TDS or Salinity place the

test sample in a sample cup with enough

depth (2.5cm minimum) to cover the

electrode. Stir the solution to remove any

air bubbles.

2. For pH, place the tip of the electrode in the

sample or make contact with a wet surface.

Measurement:

1. Press the ON button. ( and then “SELF CAL” will appear in the

display during the turn-on diagnostics)

2. Depress and hold the MODE/HOLD key to scroll to the desired

measurement mode.

3. Insert the electrode into the sample making sure that the electrodes

are completely submersed.

4. Slowly stir the solution with the electrode to remove air bubbles if in

the Conductivity, TDS or Salinity mode.

5. If in the Conductivity, TDS or Salinity modes, the meter will auto-range

to the proper range and then display the reading.

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Changing Measurement Function

The meter can be set to measure pH, Conductivity, TDS or Salinity.

To change the mode:

1. Press and Hold the MODE/HOLD button for 2 seconds and the

display will begin to scroll through the units.

pH; µS (Conductivity); ppm S (Salinity); ppm (TDS); mg/l (TDS);

Note: The “HOLD” function cannot be on when changing the

measurement function. If “HOLD” is displayed in the lower left corner of

the display, briefly press the MODE/HOLD button to turn it off.

2. When the desired units are displayed, release the MODE/HOLD

button.

TDS Compensation Ratio

The TDS value is determined by multiplying a conductivity reading by a

known ratio factor. The meter allows for selecting a conversion ratio in

the range of 0.40 to 1.00. The ratio varies with the application, but is

typically set between 0.50 and 0.70.

Note: The stored ratio will briefly appear in the lower temperature

display when the meter is first turned on, or when changing

measurement function to TDS.

Note: In the Salinity mode the ratio is 0.40 to 0.60 auto.

To change the ratio, while in the TDS measurement mode (ppm or mg/l):

1. Press and release the CAL/RECALL button twice in

succession. The stored ratio will appear in the

display.

2. Press the MODE/HOLD button to increase the ratio value in steps of 0.01.

3. When the desired ratio is displayed, press and

release the CAL/RECALL button to store the

value and return to the normal mode.

4. If no buttons are pressed for 5 seconds, the

meter returns to measure mode.

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Storing Readings

1. Press the MODE/HOLD button to store a reading.

The storage location number will be displayed on

the lower display, while the main display shows

the stored reading. The meter will enter the HOLD

mode and the “HOLD” indicator will appear.

2. Press the MODE/HOLD button again to exit the

HOLD mode and return to normal operation.

3. If more than 25 readings are stored, previously

stored readings (starting with number 1) will be

overwritten.

Recalling Stored Readings

1. Press the CAL/RECALL button and then press the MODE/HOLD

button. A location number (1 through 25) will briefly appear and then

the value stored in that location will appear. The displayed units will

flash, indicating that the storage recall mode is active.

2. The last stored reading will be displayed first. Pressing and releasing

the MODE/HOLD button will scroll through the stored readings one at

a time. The location number is displayed first, followed by the reading

stored in that location.

3. To exit the storage mode, press the CAL/RECALL button and the

meter will return to normal operation, after displaying “End”.

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Clear Stored Memory

With the unit on, press and hold ON/OFF for 4 seconds. “CLr” will be

briefly displayed when the memory is cleared.

Changing Temperature Units

To change the displayed temperature units (oC or oF):

1. With the unit OFF, press and hold down the CAL/RECALL button.

2. With the CAL/RECALL button depressed momentarily press the

ON/OFF button. When “SELF CAL” appears in the display release the

CAL/RECALL button. The unit will power on with temperature

displayed in the new units.

Data Hold Mode

Press the MODE/HOLD button to hold (freeze) a reading in the display.

The meter will enter the HOLD mode and the “HOLD” indicator will

appear.

Note: This also stores the reading.

Press the MODE/HOLD button again to return to normal operation.

Auto Power OFF

The auto power off feature automatically shuts the meter off 10 minutes

after the most recent button press.

Auto Power OFF Disable

To disable the Auto Power Off feature:

1. Turn the unit on.

2. Press CAL/RECALL once (Quickly)

3. Immediately and simultaneously press the MODE/HOLD and ON/OFF

buttons for approximately 2 seconds, until “oFF” is briefly displayed

To disengage this feature, turn the unit off with the ON/OFF button. The

next time the unit is powered up, Auto Power OFF mode will be engaged

again.

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Low Battery Indication

When the batteries become weak the “ ” icon will appear in the

display. Refer to the Maintenance section for battery replacement

information.

Calibration - pH (1, 2, or 3 points)

1. Place the electrode into a buffer solution (4, 7, or 10). Press and hold

the CAL/RECALL key until “CAL” appears in the lower (temp.)

display. When doing a 2 or 3 point calibration, calibrate with pH 7

buffer first, then follow with pH 4 then the pH 10 buffer.

2. The WQ120 automatically recognizes the solution and calibrates

itself to that value (the circled number on the LCD will match the

solution). Note that if the solution is more than 1 pH unit off from the

L (4), M (7), or H (10) pH buffer, or if the electrode slope is low, the

WQ120 will assume an error and abort the calibration (‘End’ will be

displayed, and the unit will return to measure mode.)

3. During calibration, the pH reading flashes on the main display.

4. When calibration is complete, the WQ120 automatically displays

“SA”, then “End” and returns to normal operation mode.

5. The appropriate circled indicator (L, M, or H) appears on the LCD

when a particular calibration or series of calibrations has been

completed within one power on cycle. When the WQ120 is turned off,

the circled indicator configuration and the calibration data will be

retained.

6. For a two or three-point calibration, repeat steps 1-4.

7. See Reset Calibration Data to clear all calibration data from the

meter.

CAL Reminder Display

When in pH measurement mode, a “CAL” icon will appear after 15 on/off

cycles of the meter without performing a calibration. The CAL display is

simply a reminder to calibrate pH, and will turn off when the pH electrode

is recalibrated. The reminder does not affect function in any way.

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RENEW Display

A flashing ‘RENEW’ warning indicates that the probe is not performing to

expected specifications. If cleaning and recalibration does not cause the

RENEW icon to disappear, replace the probe (see optional accessories

on the last page of this manual). The RENEW display appears as a

result of the pH electrode slope falling below 65% of a nominal slope.

Measurement and Display Considerations

If the unit appears to be locked (display frozen). It is possible that the

Data Hold mode has been inadvertently accessed by pressing the

MODE/HOLD button. (“HOLD” will be displayed in the bottom left of the

LCD.) Simply press the MODE/HOLD button again or turn the meter off

and then on.

For maximum accuracy, allow sufficient time for the temperature of the

probe to reach the temperature of the sample before calibrating. This will

be indicated by a stable temperature reading on the display.

Reset Calibration Data

Follow this procedure to clear all calibration data from the meter.

Resetting the calibration data may be necessary when new calibration

solutions are used or accuracy of measurements is in question.

1. Turn off the meter.

2. Press and Hold the Cal/Recall and Mode/Hold buttons.

3. Momentarily press the On/Off button, as soon as the display comes

on, release all 3 buttons.

4. The display will show “dFLt rSt” (default reset) and all of the

calibration data will be erased. If “dFLt rSt” does not appear, retry the

procedure.

5. Proceed to the calibration routine for pH and Conductivity.

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