Extech Instruments 407303 User manual

User's Manual

Heavy Duty Conductivity/Temperature Meter

Model 407303

Introduction

Congratulations on your purchase of Extech’s Conductivity/ Temperature Meter. This meter

offers a dual display of Conductivity and Temperature, Conductivity Cell calibration adjust,

Auto/Manual temperature compensation, and a RS-232 PC Interface. This professional

meter, with proper care, will provide years of safe reliable service.

407303 Ver 1.6 03/01

Specifications

Circuit Custom LSI microprocessor circuit

Display Dual function 0.5" (13mm) 1999 count LCD w/ contrast adjust

Measurements Conductivity in µS and mS; Temperature oC/F

Data hold Freezes displayed value

Sensor Structure Remote Conductivity Sensor: Carbon rod type

Temperature sensor: Precision thermistor

Temp. compensation

adjust 0 to 5% per °C over the range of 32 to 140°F (0 to 60°C)

Data recording Record the Min/Max/Avg readings for later recall

Auto Power OFF Automatic power off after 10 minutes

PC Interface RS 232 serial data output

Operating conditions Temperature: 32°F to 122°F (0°C to 50°C); Humidity <80% RH

Power Supply 9V battery

Power Consumption Approx. 7.8 mA DC

Weight 0.77 lbs (350 g) (including batteries & probe)

Dimensions Main instrument: 7.1 x 2.8 x 1.3" (180 x 72 x 32 mm)

Probe: 0.87" (22 mm) diameter

Measurement

Range Resolution Accuracy

0.1 to 199.9 µS 0.1 µS

0.2 to 1.999 mS 0.001 mS

Conductivity

2 to 19.99 mS 0.01 mS

+(3% F.S. + 1d)

(after calibration)

Temperature 32 to 140°F (0 to 60 °C) 0.1°C / 0.1 °F +0.8 °C / 1.5 °F

Meter Description

1 LCD Display

2 POWER key

3 Data "HOLD" key

4 °C/ F" Select key

5 LCD Contrast adjust

6 Memory "RECORD" key

7 Memory "RECALL" key

8 Temp Coefficient adjust

9 Range key

10 Temp Coefficient key

11 Battery cover (rear)

12 RS-232 output jack (to

13 Sensor input socket (to

14 Electrode handle

15 Electrode tip

16 Electrode plug

407303 Ver 1.6 03/01

Operation

Preparation for use

1. Install the sensor plug into the sensor's input socket.

2. Press the Power key to turn on the meter.

3. Select the temperature units by pressing the C/ F key. The display will indicate

C or F as selected.

4. Select the Conductivity units by pressing the Units key.

Conductivity Calibration

The Conductivity probe calibration should be performed frequently to minimize

measurement errors.

1. Remove the battery from the battery compartment to gain access to the

calibration adjustments. Refer to the diagram below.

2. Prepare a standard conductivity solution of a value close to the value of the

solution to be tested.

3. Place the probe into the calibration solution and adjust VR4 until the meter

reads the correct value. Other VR pots are for factory use only. Do not adjust.

Temperature Compensation

The unit defaults to a 2% per oC temperature compensation factor. To manually

change the coefficient factor, follow the steps below:

1. Set the meter to the 200 µS range via the Units key.

2. Press the TEMP key

3. Press the Factor Adjust key to select the desired compensation factor (in

increments of 0.1 % per degree C).

4. Once the desired factor is set, press the TEMP key again.

Range Select

1. If the display shows “-------“, the meter is in an overange condition. Press the

range key to select a higher range

2. If the display shows “_____“, the meter is in an underrange condition. Press the

range key to select a lower range

Data Hold

Press the Data Hold key to freeze the displayed value. The LCD will display DH for

Data Hold mode along with the held reading. Press the Hold key again to release

the data hold function.

MIN/MAX/AVG Data Recording

When selected, the Data Recording function records the Min, Max, and Average

readings. To start a data recording session:

1. Press the RECORD key once. The REC indicator will appear on the display

and the meter will begin to record the lowest (min), highest (max), and

average (avg) readings.

2. To recall the data, press the RECALL key once. The MAX indicator will

appear along with the highest reading recorded since the RECORD key was

pressed.

3. Press the RECALL key again to view the MIN value.

4. Press the RECALL key again to view the AVG reading.

5. To exit the Record mode, press the RECORD key again. The display

indicators REC, MIN, MAX, and AVG will disappear.

VR4

Battery Compartment

View from bottom of meter

407303 Ver 1.6 03/01

Auto Power OFF

The meter includes an Auto shut off feature that preserves battery life. The meter

will automatically turn off if no function button is pressed in any 10 minute period. To

disable this feature press the RECORD key to engage the record function.

LCD Contrast Adjust

It may be necessary to adjust the display contrast due to a change in viewing angle or

voltage drift. Use the LCD Contrast adjustment located on the right side of the meter

to set the preferred contrast.

RS-232 PC Interface

The meter includes a RS-232 serial data port. This interface was designed to operate with

the Extech Data Acquisition Software/Hardware kit Part No. 407000. This kit enables the

user to capture, store and display readings using a PC. For more information contact

Extech or refer to the 407000 User Manual for details.

Battery Replacement

The low battery indication LBT appears on the LCD when the battery runs low.

To replace the battery:

1. Remove the meter's rubber protective cover to access the rear battery

compartment.

2. Remove the battery compartment cover using a small coin or screwdriver and

remove the 9V battery.

3. Replace the 9V battery and reinstall the cover and holster.

Conductivity Probe Care

To prepare the probe for use, remove the outer protective sheath used during shipping.

Probe Storage

On sheathed cells, replace the sheath over the probe when storing. For non-sheathed

versions, keep the probe’s tip soaking in de-ionized water in storage

Probe Cleaning

After each use the probe tip should be rinsed with de-ionized water. If solids build up

inside the probe, carefully remove them with a cotton swab soaked in solvent.

Caution: Be sure not to touch the metal parts of the inner probe.

407303 Ver 1.6 03/01

Calibration and Repair Services

Extech offers complete repair and calibration services for all of the products we sell. For

periodic calibration, NIST certification or repair of any Extech product, call customer

service for details on services available. Extech recommends that calibration be performed

on an annual basis to insure calibration integrity.

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and

workmanship for 3 years from date of shipment (a six month limited warranty applies on sensors and

cables). If it should become necessary to return the instrument for service during or beyond the warranty

period, contact the Customer Service Department at (781) 890-7440 for authorization. A Return

Authorization (RA) number must be issued before any product is returned to Extech. The sender is

responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transit.

This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring,

operation outside of specification, improper maintenance or repair, or unauthorized modification. Extech

specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not

be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to

repair or replacement of the product.

The warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or

implied.

including the right of reproduction in whole or in part in any form.

(

Tech Support Hotlines

781-890-7440 ext. 200

[email protected]

www.extech.com

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