Extech Instruments 407303 User manual

User's Guide

Heavy Duty Conductivity / Temperature

Model 407303

Introduction

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

meter offers a dual display for Conductivity and Temperature, a Conductivity Cell

calibration adjustment, temperature compensation, and a RS-232 PC Interface. This meter

is shipped fully tested and calibrated and with proper use will provide years of reliable

service.

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Back to the Extech 407303 Product Page

407303 V3.1 01/062

Specifications

Circuit Custom LSI microprocessor circuit

Display Dual function 2000 count LCD with contrast adjust

Measurement units Conductivity in Siemens (µS and mS); Temperature in oC/oF

Data hold Freezes displayed value

Sensor Structure Remote Conductivity Sensor: 1K Carbon rod type

Temperature sensor: Precision thermistor

Temperature

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

Record/Recall 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); < 80% R.H.

Power Supply 9V battery

Power Consumption Approx. 10 mA DC

Weight 17 oz. (482 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% + 1d)

FULL SCALE

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

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

407303 V3.1 01/063

Meter Description

1. Sensor input plug – The plug is keyed so that it can only be inserted one way into the

sensor jack at top of meter

2. RS-232 PC Interface jack – For use with Model 407001 Data acquisition software and

interface cable kit

3. LCD Display indicates Conductivity and Temperature, unit of measure, and other user

alert symbols discussed in this manual

4. Push-buttons:

•POWER – Press to turn the meter ON or OFF

•HOLD – Press to freeze the displayed reading

•C/F – Press to select the temperature unit of measure

•RECORD – Press to begin tracking the MIN/MAX readings

•RECALL – Press to retrieve the MIN/MAX readings

•FACTOR ADJUST – Used with the TEMP button for temperature compensation

•RANGE – Slide switch to manually select the measurement range

•TEMP – Temperature coefficient compensation button

5. Battery compartment (rear) – Remove protective holster to access the compartment

6. LCD contrast adjustment dial – Adjust to desired view setting

7. Sensor top – Conductivity and Temperature sensor reside in sensor top

8. Rubber protective holster – Remove holster to access rear battery compartment

407303 V3.1 01/064

Operation

Connecting the Sensor

1. Remove the protective sheath from the sensor tip before use. Retain the sheath for

sensor storage.

2. The sensor connects to the input jack at the top of the meter. The sensor jack is keyed,

thereby allowing the sensor plug to be inserted from only one direction. Line up the

plug with the jack before firmly inserting the sensor. Avoid undue force; forcing the

sensor into the jack may bend the pins in the sensor plug.

Powering the meter

1. Press the POWER button to turn the meter ON or OFF. If the meter does not switch on

when the POWER button is pressed, check the battery. Refer to the battery installation

and replacement section later in this manual.

2. This meter is equipped with an Automatic Power OFF feature. To conserve battery

energy, the meter shuts off after 10 minutes. To defeat this feature, press the

RECORD button to access the Record/Recall mode. In the Record/Recall mode, the

meter will remain on until the user turns it off or until the battery weakens.

LCD Contrast Adjustment

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

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

to set the preferred contrast.

Taking Measurements and using the RANGE select slide switch

1. Insert the sensor tip into the solution under test.

2. The conductivity and temperature readings will appear on the LCD. Conductivity

measurements appear at the center of the LCD. Temperature readings appear on the

bottom of the LCD in smaller digits.

3. Allow time for the measurements to stabilize. The LCD display digits will settle after a

short stabilization period.

4. If dashes appear on the top of the LCD measurement area, the reading is over range.

Slide the RANGE select switch to a higher range. If dashes appear on the bottom of

the measurement display area, the reading is under range. Slide the RANGE switch to

a lower range.

Selecting oC/oF units of measure

Press the oC/oF button to select the Temperature unit of measure. The display will reflect

the currently selected unit of measure.

Temperature Compensation using the FACTOR ADJ and TEMP buttons

This meter has a user adjustable temperature compensation feature that accommodates a

change in conductivity due to a change in solution temperature. The default compensation

is 2% and applies to most common standard salt solutions. Other solutions have known

temperature coefficients and the temperature adjustment allows the user to set it to match

the solution. To change the coefficient:

1. Set the meter to the 200µS range via the RANGE slide switch

2. Press the TEMP button

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

of 0.1% per degree C). The display will show the factor as it is adjusted.

4. Once the desired factor is set, press the TEMP button.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

407303 V3.1 01/065

Data Hold

To freeze the LCD display, press the HOLD button. The 'DH' display icon will appear on

the LCD when the meter is in the Data Hold mode. Press HOLD again to return to normal

operation (the 'DH' icon will switch off).

MIN/MAX/AVG Record/Recall Mode

1. To begin capturing the Minimum (MIN), Maximum (MAX), and Average (AVG)

Conductivity and Temperature values, press the RECORD button (REC will appear on

the LCD).

2. To recall the MAX reading press the RECALL button. The MAX display icon will appear

and the measurement display areas will indicate the highest reading encountered since

the RECORD button was pressed.

3. Press the RECALL button again to view the MIN reading.

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

5. Press the RECORD button to exit and return to normal operation. The REC, MAX,

MIN, and AVG icons should be off when the meter has exited the MIN/MAX/AVG

Record/Recall mode.

Conductivity Calibration

1. Keep the battery connected to the meter, but remove it

from the battery compartment..

2. Prepare a standard conductivity solution of one or all of

the following: 200uS, 2.000mS and 20.00mS.

3. Place the probe into the calibration solution and adjust

the corresponding potentiometer in the battery

compartment until the meter reads the value of the

standard solution. Other VR potentiometers located in

the battery compartment should not be adjusted.

VR3 200uS

VR4 2.000mS

VR6 20.00mS

Sensor Care

Sensor Storage

On sheathed cells, replace the sheath when storing. For non-sheathed versions, soak the

sensor tip in de-ionized water in storage.

Sensor Cleaning

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

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

do not touch the metal parts inside the sensor.



Support line (781) 890-7440

Technical support: Extension 200; E-mail: [email protected]

Repair & Returns: Extension 210; E-mail: repair@extech.com

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451

RS-232 PC Interface

This meter is equipped with an RS-232 PC Interface jack. The jack is located at the top of

the meter next to the sensor input jack. The interface is intended for use with the data

acquisition software and hardware kit. For more information contact Extech or refer to the

Software User Manual.

Battery Replacement

The low battery indicator 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. Pry open the battery compartment cover using a small coin or screwdriver.

3. Replace the 9V battery and attach the compartment cover and protective holster.

Warranty

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

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