ECD L20 C User Manual

Model L20C

Instruction Manual

Microprocessor based

Conductivity TDS Temperature

Bench Top Meter

Electro-Chemical Devices, Inc.

1681 Kettering, Irvine, CA 92614 USA

Telephone: [phone]

FAX: [phone]

www.ecdi.com

Contents

General Introduction .................................... 3

Initial Inspection ........................................... 3

Power ............................................................ 3

Installing the Batteries .................................................. 4

Display and Key Functions ............................ 5

A. Display ...................................................................... 5

B. Keys ........................................................................... 6

Operational Procedures................................ 7

A. Preparing Standard Solutions ................................... 7

B. Calibration ................................................................ 7

TDS Constant ............................................................ 7

Temperature Coefficient .......................................... 8

Temperature Reference ........................................... 8

Probe Basic Cell Constant ......................................... 8

Cell Constant Calibration .......................................... 8

K Value Input ............................................................ 9

C. Conductivity Measurements .................................... 9

Error Displays and troubleshooting ............ 10

Specifications .............................................. 11

Warranty ..................................................... 12

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General Introduction

Thank you for selecting the Model L20C meter. The Model L20C is a
precision tool that measures Conductivity, TDS and Temperature. A
built-in microprocessor stores, calculates and compensate for all
parameters related to Conductivity, TDS and Temperature
determinations.
This meter has a waterproof IP54 case. The mechanical keys are
highly reliable with tactile and audio feedback. This meter is
powered by six AAA-size alkaline batteries or with a UL approved AC
adapter (OUTPUT: DC9V). The meter also displays a “BAT” message
when the batteries are in need of replacement. Re-calibration is not
required when power is restored. The front of the meter has a large
LCD that displays Conductivity or TDS and Temperature
simultaneously along with user prompts and mode indicators. The
unit prompts the user through calibration and measurement
procedures. The Model L20C micro-processor allows the user to
easily recalibrate the parameters for the probe. A few keystrokes
will adjust all the parameters for conductivity and will also give the
user the option to select four types (0.01, 0.1, 1.0, 10.0) of probe cell
constant for a better selection of available probes and applications.
And the user can input K value of the cell by keypad directly. The
system simultaneously displays temperature in ℃ along with either

Conductivity or TDS. The user can switch back and forth from all
these displays by just pushing a single “MODE” key. Other

features include automatic conductivity ranging, automatic
temperature compensation, long battery life, and 50/60 Hz AC noise
rejection. This meter is user-friendly for laboratory application.

Initial Inspection

Carefully unpack the unit and accessories. Inspect for damages made
in shipment. If any damage is found, notify your ECD representative
immediately. All packing materials should be saved until satisfactory
operation is confirmed.

Power

The model EC3175 can be powered by an 115V or 230VAC adaptor
as well as 6 “AAA” alkaline batteries. Check the label on the AC
adaptor supplied with the instrument to make sure that the AC line

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voltage is correct. If the wrong AC adaptor is supplied, notify your

ECD representative immediately.

Installing the Batteries

To insert the batteries into the meter, follow the procedure outlined
below.

1.Use two hands to flip the two buckles and battery cover to expose
the battery compartment. (Figure 1)

2.Note the polarity and insert the six AAA batteries into the battery
compartment correctly.

3.Replace the battery cover.

Figure 1

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