USER GUIDE
Turbidity Meter
Model TB400
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
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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Calibration
CAL
ntu
0.00
CAL ntu
CAL
0.00 ntu
100
CAL ntu
A complete calibration will require testing with both 0 NTU and 100 NTU test solutions.
Notes: Before calibrating, gently shake the test solution bottle for approximately two seconds.
Ensure that the sides of the bottle are clean and dry to prevent measurement errors.
Calibration Procedure (0 NTU)
1. Insert the Zero NTU solution bottle into the testing chamber, line up the white marks, and
close and latch the cover. Turn on the meter and Press and hold the "CAL" button until the
LCD displays "CAL" then release the “CAL” button.
2. Wait one second and then the LCD will display:
Note: If the LCD does not display zero when using "0 NTU" liquid, press the "ZERO" button
continuously until the LCD displays a zero value.
3. The meter is now ready for "0 NTU" calibration.
4. Momentarily press "CAL" button. The LCD will flash CAL for about 10 seconds and then show
5. The LCD will then display:
6. The Zero NTU calibration is complete. The meter is now ready for the 100 ntu calibration.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
the following display:
TestEquipmentDepot.com
TB400-EU-EN V1.1 10/13
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Calibration Procedure (100 NTU)
CAL
100 ntu
1. Lift the lid on the test chamber and remove the 0 NTU test solution bottle.
2. Gently shake the 100 NTU test solution bottle, insert it into the test chamber and close and
lock the cover.
3. Momentarily Press the "CAL" button. The LCD will flash CAL for 10 seconds.
4. When calibration is complete the LCD will return to normal operating mode.
NOTE: If the following error message appears "Error cannot be calibrated..." check the value of the
standard solution. If error message still appears complete the "Calibration Clear"
procedure.
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Calibration Clear Procedure
CAL
ntu
0.00
CAL ntu
CLr
CAL ntu
CAL
CLr
100
CAL ntu
1. The calibration clear procedure will clear all calibration values and return the meter to
default settings.
2. Power ON the meter with the cover closed but no testing bottle in the chamber.
3. Press the "CAL" button continuously until the LCD displays "CAL"
4. Wait one second; the LCD will then display:
5. Momentarily press the "HOLD" button. The LCD will display:
6. Momentarily press the "HOLD" button again. The LCD will display:
7. Momentarily Press the "CAL" button. The LCD will flash "CAL" for 10 seconds:
8. The calibration data clear is complete. The meter will return to normal operating mode.
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Maintenance
Low Battery Indication
When the batteries become weak the “ ” icon will appear in the display. Refer to the Battery
Replacement section for battery replacement information.
Battery Replacement
1. Remove the two (2) screws on the back of meter and remove the battery cover.
2. Replace the six (6) AAA batteries observing polarity.
3. Close the battery cover and replace the screws.
Battery Safety Reminders
Never dispose of batteries in a fire. Batteries may explode or leak.
Never mix battery types. Always install new batteries of the same type.
Never dispose of used batteries or rechargeable batteries in household waste.
As consumers, users are legally required to take used batteries to appropriate
collection sites, the retail store where the batteries were purchased, or wherever
batteries are sold.
Disposal: Do not dispose of this instrument in household waste. The user is
obligated to take end-of-life devices to a designated collection point for the disposal
of electrical and electronic equipment.
Cleaning
Wipe the meter housing with a damp cloth. Do not use abrasives or solvents.
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Specifications
Display LCD size: 41mm x 34mm (1.6 x 1.3”)
Range 0.00 to 50.00 NTU (Nephelometric Turbidity Unit)
50 to 1000 NTU
Resolution 0.01 NTU/1 NTU
Accuracy ±5% FS or ± 0.5 NTU whichever is greater
Operating Temperature 0 to 50oC (32 to 122oF)
Operating Humidity Less than 85% RH
Light Source LED, 850 nm
Light Detector Photo Diode
Response Time Less than 10 seconds
Sample Volume 10mL minimum
Power Six 1.5V AAA batteries
Power consumption Standby Mode: approx. 3.5mADC; Testing Mode: approx. 36mADC
Dimensions/Weight 155 x 76 x 62mm (6.1 x 3.0 x 2.4”); 320g (0.70lbs)
Auto Power OFF Automatically switches off 10 minutes after the last key press
Standard Meets ISO 7027
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
TB400-EU-EN V1.1 10/13
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