Extech Instruments ExStik II EC400 Manual de usuario

User Manual

ExStik®II EC400

Conductivity / TDS / Salinity / Temperature Meter

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EC400-en-GB_V2.7 12/16

Introduction

Congratulations on your purchase of the ExStik®II EC400 Conductivity/Total Dissolved Solids

(TDS) / Salinity / Temperature meter. With the EC400’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 will provide years of reliable service.

Powering the ExStik®II

The ExStik®II uses four (4) CR2032 Lithium Ion Batteries (included). If the batteries are weak, the

‘BAT’ indicator appears on the LCD. Press the ON/OFF key to turn the ExStik®II on or off. The auto

power off feature shuts the ExStik®II off automatically after 10 minutes of inactivity to preserve

battery life.

Getting Started

Remove the cap from the bottom of the ExStik®II to expose the conductivity electrode.

Before the first use or after storage, rinse the electrode in deionized water and dry.

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.

Store dry.

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Meter Description

Front Panel Description

1. Battery compartment

2. LCD Display

3. MODE/HOLD button (change mode, Hold and

store data)

4. CAL/RECALL button (calibrate, change temperature units, recall data)

5. ON/OFF button

6. Electrode Collar

7. Electrode

LCD Display

1. Bargraph display

2. Measurement units

3. Main display

4. Range calibration and

low battery indicators

5. Temperature display

6. Reading Hold Indicator

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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.

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.

5. 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 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.

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

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 0.4 to 1.0. The ratio varies with the

application, but is typically set between 0.5 and 0.7.

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 0.4 to 0.6 automatic.

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 0.1.

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.

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.

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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”.

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 after 10 minutes of button inactivity.

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.

Low Battery Indication

When the batteries become weak the “BAT” icon will appear in the display. Refer to the Maintenance

section for battery replacement information.

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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 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.

Calibration - Conductivity

Meter accuracy verification should be performed on a periodic basis. Once per month is the

recommended cycle for normal use. If calibration is required, a conductivity standardizing solution

must be obtained. The meter can be calibrated in any or all of the three ranges. Standardizing

solutions of 84µS/cm, 1413µS/cm or 12.88mS/cm (12,880µS/cm) are used for the automatic

calibration recognition procedure. No other calibration values are permitted.

Calibration is always done in conductivity mode. Since salinity and TDS values are calculated from

conductivity values, this procedure also calibrates the salinity and TDS ranges.

1. Fill a sample cup with the standardizing solution.

2. Turn the meter ON and insert the electrode into the solution. Tap or move the electrode in the

sample to dislodge any air bubbles.

3. Press and hold the

CAL/RECALL

button (approximately 2 seconds) until “CAL” appears in

the lower (temp) display. The main display will start flashing.

4. The meter will automatically recognize and calibrate to the standardizing solution. The display

will briefly indicate “SA”, “End” and then return to the measurement mode after a calibration.

Note: The “SA” will not appear if the calibration fails.

5. The “range calibrated” symbol will appear in the display for each range that is calibrated

during that power on cycle.

Low range, 84µS/cm

Medium range, 1413µS/cm

High range, 12.88mS/cm (12,880µS/cm)

Note: Each time the calibration mode is entered all calibration symbols on the display are cleared,

but only the calibration data for the currently calibrated range is replaced. The other two ranges

keep the existing calibration data, just the symbols are removed. Calibration of all three ranges must

be performed during one power on period for all three range calibration symbols to appear.

See

Reset Calibration Data

to clear all calibration data from the meter.

Note: The meter allows for a 1, 2 or 3 point calibration. If calibration is done for more than one point

the lowest value standard should be done first to obtain the best accuracy.

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Considerations and Techniques

Do not touch the inner surfaces of the conductivity electrodes. Touching the surface of the

platinized electodes may damage and reduce the life of the probe.

Store the electrode dry, in the storage cap.

Always rinse the electrode in de-ionized water between measurements to avoid cross

contamination of the sample. Double rinsing is recommended when high accuracy is required.

Operational Matrix

Function /

Resulting

Action

Power

Status

Mode

Setting

Required Key Press Sequence

On/Off On or

Off

Any Momentary press of the ON/OFF key

Calibration On Conductivity Press & hold CAL/RECALL key for 2

seconds, until it enters CAL function

Store

Reading

On Any measure

mode

Momentary press of the MODE/HOLD key

Hold Release On While In Hold

Mode

Momentary press of the MODE/HOLD key

Enter

Memory

Retrieval

On Any measure

mode

Momentary press of the CAL/RECALL key

followed by a momentary press of the

MODE/HOLD key (Within 4 seconds)

Scroll Stored

Readings

On Memory

Recall

Momentary press of the MODE/HOLD key

(Displays “last in first out”)

Exit Memory

Retrieval

On Memory

Recall

Momentary press of the CAL/RECALL key

Clear Stored

Memory

On Any Measure

Mode

Press and hold the ON/OFF key for 4

seconds, until “clr” is displayed.

Change

Measurement

Mode

On Any Press and hold the MODE/HOLD key for at

least 2 seconds (the modes will scroll by

until the key is released)

Enter

Cond/TDS

Ratio

On TDS (ppm or

mg/l)

Press and release the CAL/RECALL key

twice in quick succession

Change

Cond/TDS

Ratio

On TDS ratio Momentary press of the MODE/HOLD key

(each key press increases the ratio by 0.1,

the value cycles from 0.4 - 1.0)

Exit

Cond/TDS

Ratio

On TDS ratio Momentary press of the CAL/RECALL key

Change

Temperature

Units

Off n/a (off

mode)

Press and hold the CAL/RECALL key then

momentarily press the On/Off key. Release

the CAL/RECALL key after the "SELF CAL"

lights

Override

Auto Power

Off

On Any measure

mode

Momentarily press the Cal Key then

simultaneously press and hold the ON/OFF

& MODE/HOLD key for approximately 2

seconds, until “oFF” is displayed

Default Reset OFF n/a Simultaneously press ON/OFF,

CAL/RECALL and MODE/HOLD

momentarily. “dFLt” will be displayed.

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Specifications

Display 2000 count LCD with Bargraph

Conductivity ranges 0 to 199.9µS/cm

200 to 1999µS/cm

2.00 to 19.99mS/cm

TDS ranges 0 to 99.9ppm or mg/L

(Variable ratio) 100 to 999ppm or mg/L

1.00 to 9.99ppt or g/L

Salinity range 0 to 99.9ppm

100 to 999ppm

1.00 to 9.99ppt

TDS Ratio 0.4 to 1.0 adjustable

Salinity Ratio 0.4 to 0.6 automatic

Conductivity ATC 2.0% per oC

Conductivity ATC Range 0.0°C to 60.0oC (32.0°F to 140oF)

Temperature Range 0.0°C to 65.0oC (32.0°F to 149°F)

Temperature Resolution 0.1 up to 99.9, 1 >100

Temperature Accuracy ±1°C; 1.8°F (from 0 to 50°C; 32 to 122°F)

±3°C; 5.4°F (from 50 to 65°C; 122 to 149°F)

Accuracy Conductivity: ±2% full scale

TDS: ±2% full scale

Salinity: ±2% full scale

Measurement Memory 25 tagged (numbered) readings

Low battery indication ‘BAT’ appears on the LCD

Power Four (4) CR2032 Lithium Ion Batteries

Auto power off After 10 minutes (override available)

Operating conditions -5°C to 50oC (23°F to 122oF)

Dimensions 40 x 187 x 40 mm (1.6 x 7.4 x 1.6”)

Weight 87 g (3.1 oz)

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EC400-en-GB_V2.7 12/16

Maintenance

Battery Replacement

1. Twist off the battery compartment cap.

2. Holding the battery housing in place with a finger, pull out the battery carrier using the two

small tabs.

3. Replace the four (4) CR2032 batteries observing polarity.

4. Replace the battery compartment cap

Never dispose of used batteries or rechargeable batteries in household waste.

As consumers, users are legally required to take used batteries to appropriate collection

sites, the retail store where the batteries were purchased, or wherever batteries are sold.

Disposal:

Do not dispose of this instrument in household waste. The user is obligated to

take end-of-life devices to a designated collection point for the disposal of electrical and

electronic equipment.

Electrode Replacement

1. To remove an electrode, unscrew and completely remove the electrode collar (turn the collar

counter-clockwise to remove).

2. Gently rock the electrode from side to side, pulling it downwards, until it disconnects from the

meter.

3. To attach an electrode, carefully plug the electrode into the meter socket (note that the

electrode connector is keyed, ensuring proper connection).

4. Tighten the electrode collar firmly enough to make a good seal (a rubber gasket seals the

electrode with the meter).

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