Extech EC500, DO610 Operating Manual

User's Guide

ExStik® EC500

pH/Conductivity / TDS / Salinity / Temperature
Meter

EC500

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
inactivity to preserve battery life.

®

off automatically after 10 minutes of

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.

Warranty

®

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts
and workmanship for one year from date of shipment (a six month limited warranty applies to
sensors and cables). If it should become neces sary to return the instrument for service during or
beyond the warranty period, contact the Customer S ervice Department at (781) 89 0-7440 ex t. 210
for authorization or visit our website www.extech.com for contact information. A Return
Authorization (RA) number must be iss ued be fore any product is returned to Extech. The sender is
responsible for shipping charges, freight, insur ance and proper packaging to prevent damage in
transit. This warranty does not apply to defects resulti ng from action of the user such as misuse,
improper wiring, operation outside of specification, improper maintenance or repair, or
unauthorized modification. Extech spec ifically disclaims any implied warr anties or merchantability
or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or
consequential damages. Extech's t otal liability is limited to repair or replace ment of the product.
The warranty set forth above is inclusive and no other warranty, whether written or oral, is
expressed or implied.

2

EC500 V2.1 7/13/05

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 90
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 ratio 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
Temperature Range -5.0°C to 90.0
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 60.0
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 50
Dimensions 40 x 200 x 40 mm (1.6 x 7.9 x 1.6”)
Weight 93 g (3.3 oz)

o

C (32°F to 194oF)

o

C

o

C (23.0°F to 194oF)

o

C (32.0°F to 140oF)

o

C (23°F to 122oF)

3

EC500 V2.1 7/13/05

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

EC500

pH

RENEW

6
7

4

EC500 V2.1 7/13/05