Extech Extech TB400 Manual

USER GUIDE

Turbidity Meter

Model TB400

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

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Introduction

Congratulations on your purchase of the TB400 Turbidity tester. The TB400 measures turbidity
up to 1000 NTU. The advantages of the TB400 to the user include: Easy to use and maintain, high
accuracy, self-calibration, and fast response. This meter is shipped fully tested and calibrated
and, with proper use, will provide years of reliable service. Please visit our website to check for
the latest version of this User Guide, Product Updates, and Customer Support.

Applications

Typical applications include the measurement of municipal water, food and beverage water, or
other aqueous solutions where fluid clarity is important.

Meter Description

1. LCD Display

2. HOLD button

3. REC-MAX-MIN button

4. POWER button

5. ZERO button

6. TEST-CAL button

7. Test bottle chamber latch

8. Test bottle chamber

9. Test bottle

Battery compartment on rear of meter

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Measurement Procedure

Calibration

1. Ensure that the meter has been calibrated prior to use.

2. Refer to the calibration section for this procedure.

Sample Preparation

1. Place the testing liquid into the supplied sample bottle up to the 10mL line and secure

the cap to the bottle.

2. Clean and dry the outside of the sample cup to ensure a clean surface.

Measurement

1. The meter should be switched OFF.

2. Open the test chamber cover and Insert the testing bottle completely into the chamber.

3. Line up the white mark of the testing bottle with the white mark on the edge of the test

chamber.

4. Close the chamber cover and lock it in place.

5. Press the “POWER” button to turn on the meter.

6. Momentarily press the “TEST” button. The display will flash "tESt" for approximately 10

seconds and then the turbidity value, in NTU units, will be displayed.

Data HOLD

Press the “HOLD” button once while taking a measurement to freeze the value on the display.
Press “HOLD” again to release the Data Hold function.

Data Record (MAX/MIN Readings)

1. The data record function records the MAX and Min readings. Press "REC" button once to

2. In recording mode press "REC" once. The display will show the maximum reading and "REC

3. Press "REC" button once again and "REC MIN" will appear on the LCD along with the

4. To delete the MAX or MIN value press "HOLD" once. The LCD will display "REC".

Auto-Power OFF

The Auto Power OFF feature automatically switches the TB400 OFF 10 minutes after the last key
press.

begin data recording. The LCD will display the "REC" symbol.

MAX" will appear on the LCD display.

minimum reading.

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