Extech Instruments ExStik EC500 Manual de usuario

User's Guide

ExStik®EC500

pH/Conductivity / TDS / Salinity / Temperature

Meter

EC500

EC500-EU-EN-V2.4-2/11

Introduction

Congratulations on your purchase of the ExStik®EC500 pH/Conductivity/Total Dissolved

Solids (TDS) / Salinity meter. With the EC500’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™

The ExStik®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®

on or off. The auto power off feature shuts the ExStik®off automatically after 10 minutes of

inactivity to preserve battery life.

Getting Started

•Remove the cap from the bottom of the ExStik 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.

EC500-EU-EN-V2.4-2/11

EC500

Meter Description

Front Panel Description

1. Battery compartment cover

2. LCD Display

3. MODE/HOLD button

4. CAL/RECALL button

5. ON/OFF button

6. Electrode Collar

7. pH/Conductivity Electrode

(Note: The Electrode cap is not shown)

LCD Display

1. Bargraph display

2. Measurement units

3. Main display

4. Range calibration and

low battery indicators

5. Temperature display

6. Renew indicator

7. Reading hold indicator

RENEW

EC500-EU-EN-V2.4-2/11

8888

Conductivity

TDS

Salinity PH

LMH

(ppm) (mg/l)

mgL

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.

EC500

EC500-EU-EN-V2.4-2/11

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.

µS (Conductivity); pH; 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 0.4 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 fixed at 0.5.

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.

EC500-EU-EN-V2.4-2/11

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 10 minutes after the most

recent button press.

Auto Power OFF Disengage Feature

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.

19.5

EC500-EU-EN-V2.4-2/11

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 ExStik®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 ExStik®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 ExStik®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 ExStik®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.

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.

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 70% 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.

EC500-EU-EN-V2.4-2/11

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.

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.

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 in the wetting cap with the sponge moistened with pH 4.01 buffer

solution.

•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.

•Periodically, accumulated salt deposits from the reference electrode may build up in

the storage cap, and should be rinsed away. These deposits could affect measured

values of low conductivity samples.

•When measuring low conductivity samples, extra care is recommended in rinsing the

probe to avoid contamination of the sample with electrolyte from the pH reference

electrode. This will only be a factor when measuring in the low range, and can be

further minimized by increasing the volume of the sample. (Example: Try a 200 to 500

mL sample.)

•If the 20mL sample cup is to be used, then the electrode should not be allowed to sit

in the sample for any longer than necessary, to avoid electrolyte leakage into the

sample, raising the conductivity value.

EC500-EU-EN-V2.4-2/11

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 pH or

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/RECALL

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.

EC500-EU-EN-V2.4-2/11

Specifications

Display 2000 count LCD with Bargraph

pH Range 0.00 to 14.00

pH Accuracy ±0.01 pH typical

pH ATC Range 0°C to 90oC (32°F to 194oF)

pH Reference Junction Permanent gel, non-refillable

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

(Fixed ration of 0.5) 100 to 999ppm

1.00 to 9.99ppt

TDS Ratio 0.4 to 1.0 adjustable

Salinity Ratio 0.5 Fixed

Conductivity ATC 2.0% per oC

Temperature Range -5.0°C to 90.0oC (23.0°F to 194oF)

Temperature Resolution 0.1 up to 99.9, 1 >100

Temperature Accuracy ±1°C; 1.8°F (from -5 to 50°C; 23 to 122°F)

±3°C; 5.4°F (from 50 to 90°C; 122 to 194°F)

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

Accuracy Conductivity: ±2% full scale

TDS: ±2% full scale

Salinity: ±2% full scale

Measurement Storage 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 200 x 40 mm (1.6 x 7.9 x 1.6”)

Weight 93 g (3.3 oz)

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