TOA-DKK TB-31 - User Manual

Questions and Answers

D
David ParkerAug 19, 2025
What to do if my TOA-DKK TB-31 display is blank even when powered on?
- C
  Carol WalkerSep 12, 2025
  If your TOA-DKK Measuring Instruments' display remains blank after turning it on, several factors could be responsible: * The batteries may not be loaded. Ensure batteries are correctly installed. * The batteries might be dead. Replace them with fresh ones. * The batteries' polarity (+, -) might be incorrect. Verify and correct the battery polarity. * The AC adapter (if used) may not be properly connected. Ensure the AC adapter is correctly connected.
M
Mark PrestonAug 21, 2025
Why is the indication unstable and response slow on my TOA-DKK TB-31 Measuring Instruments?
- J
  James GregoryAug 21, 2025
  Unstable readings and slow response on your TOA-DKK Measuring Instruments can arise from several causes: * Air bubbles clinging to the sensor's light-receiving and light-emitting parts. Shake the sensor in the sample solution to dislodge bubbles. If this doesn't work, remove the sensor and shake it vigorously to remove bubbles and water drops. * A dirty sensor. Clean the sensor. * A degraded or broken sensor. Replace the sensor. * The sensor is not properly immersed in the sample. Ensure correct immersion. * Low sample turbidity. Wash the sensor.
W
Walter BautistaAug 25, 2025
What to do if the measured value blinks at the upper limit on TOA-DKK Measuring Instruments?
- R
  Rachel ScottAug 25, 2025
  If the measured value on your TOA-DKK Measuring Instruments blinks at the upper limit, consider these possibilities: * The sample might have a value outside the measuring range. Dilute the sample before measuring. * The sensor could be dirty. Clean the sensor. * The sensor might not be properly connected or could be cracked. Ensure the sensor is correctly connected and replace it if necessary.
S
swansonrebeccaAug 26, 2025
Why does the indicated value deviate on my TOA-DKK TB-31 Measuring Instruments?
- R
  Robert GibsonAug 26, 2025
  Deviation in the indicated value on your TOA-DKK Measuring Instruments can stem from these issues: * Air bubbles clinging to the sensor's light-receiving and light-emitting parts. Remove the bubbles by shaking the sensor in the test water. If this doesn't remove them, pull up the sensor and shake it vigorously. * A dirty sensor. Clean the sensor. * A degraded or broken sensor. Replace the sensor. * Zero or span calibration values have deviated. Erase the calibration value and perform the zero and span calibration.
G
Gregory LarsonAug 28, 2025
Why does the measured value blink at '0' or '0.0' on my TOA-DKK TB-31?
- A
  Amanda WhiteAug 28, 2025
  If the measured value blinks at “0” or “0.0” (turbidity less than “0”) and the indicated value remains at “0” without changing on your TOA-DKK Measuring Instruments, consider the following: * The zero calibration value might be incorrect. Connect the sensor properly and replace it if necessary. * The sensor could be dirty. Clean the sensor. * The sensor might not be properly connected or could be cracked. Connect the sensor properly and replace it if necessary. * The test water may be clearer than the solution used for zero calibration. Perform the zero calibration again.
C
cheryl27Aug 30, 2025
Why doesn't the display change on my TOA-DKK Measuring Instruments?
- G
  gabriela17Aug 30, 2025
  If the display on your TOA-DKK Measuring Instruments isn't changing, check these potential causes: * The hold function is activated. Turn off the hold function. * The sensor isn't properly connected. Connect the sensor correctly. * The sensor is cracked. Replace the sensor.
C
Colton RamirezSep 1, 2025
What causes a turbidity sensor start-up error on TOA-DKK Measuring Instruments?
- P
  Pamela JamesSep 2, 2025
  A turbidity sensor start-up error on TOA-DKK Measuring Instruments can occur if, when measurement starts in batch mode, the AC adapter isn't connected and the battery voltage is low. To resolve this, replace the batteries with new or fully recharged ones, or use the AC adapter (available as an option).
J
Joshua AlvarezSep 4, 2025
What causes a calibration range error on TOA-DKK TB-31 Measuring Instruments?
- A
  Austin MoralesSep 4, 2025
  A calibration range error in TOA-DKK Measuring Instruments happens when, during one-touch zero calibration, the measured input value from the sensor is excessively large. You can fix it by replacing the pure water used for calibration with new water and ensuring the light-receiving and light-emitting parts are clean by wiping them with tissue paper.
J
johnny69Sep 6, 2025
How to fix calibration slope error on TOA-DKK TB-31 Measuring Instruments?
- D
  David SmithSep 6, 2025
  A calibration slope error with TOA-DKK Measuring Instruments during 2-point calibration indicates that the slope of the calibration curve is either 0 or reversed. To fix this, ensure that the pure water used is clearer than the span prepared solution; if the pure water is dirty, replace it.
M
Mrs. Diane RiveraSep 8, 2025
Why does '-' blink on the main display of my TOA-DKK TB-31 Measuring Instruments?
- J
  Jessica JonesSep 8, 2025
  If “-” blinks on the main display of your TOA-DKK Measuring Instruments, it indicates that the sensor is not connected properly. Ensure the sensor is correctly connected; if issues persist, consider replacing the sensor.

Summary

Introduction

Optional Device Connectivity

Describes optional devices that can be connected to the instrument.

Safety Information

Meaning of Markings

Defines signal terminology and symbols used in warnings.

Safety Compliance Items

Lists safety compliance items and warnings.

General Safety Precautions

Covers tumbling, waterproofing, mixing, disassembly, and label precautions.

Warranty

Warranty Coverage

Details the warranty period and coverage for DKK-TOA products.

Limited Warranty Conditions

Lists cases not covered by the limited warranty.

Reading Guide

1. Content of Package

2. Specifications and Functions

Product Specifications

Lists technical specifications of the instrument.

Instrument Functions

Details the various built-in functions of the instrument.

3. Name and Function of Each Part

Main Body and Operation Panel

Describes the main body and operation panel, including key functions.

Display Screen Elements

Explains the various elements of the instrument's display screen.

Turbidity Sensor (Model ELL-011)

Details the names and contents of the turbidity sensor.

4. Preparations

Loading the Batteries

Step-by-step guide for loading the instrument's batteries.

Protective Cover Handling

Instructions for fitting and removing the protective cover.

Turbidity Sensor Connection

Procedures for connecting the turbidity sensor to the instrument.

Turbidity Sensor Preparation

Steps for preparing the turbidity sensor before use.

5. Basic Operation

Operation Screens Map

A visual guide to the instrument's operation screens and navigation.

Powering On the Instrument

Instructions on how to power the instrument on.

Setting the Date and Time

Guide for setting the instrument's date and time.

Calibration Data Management

Instructions for displaying and deleting calibration data.

Performing Calibration

Step-by-step guide for performing zero and span calibration.

Measurement Procedures

Overview of measurement modes and general precautions.

6. How to Use Various Functions

Auto Hold Function

Explains the auto hold function for automatic measurement stability checking and saving.

Data Memory Function

Details the data memory function for storing and recalling measurements.

Interval Function

Explains the interval function for automatic measurements at set intervals.

Display Range Switching

How to set the display range (auto, low, high).

Measurement Unit Setting

How to switch between NTU and mg/L measurement units.

Response Setting

How to adjust response settings (normal, fast, slow).

Temperature Calibration

Guide for performing temperature calibration for precise measurements.

Memory Overwrite Setting

How to set whether to overwrite data or not when exceeding 1000 entries.

Buzzer On;Off Setting

How to turn the buzzer sound on or off.

Auto Power Off Setting

How to configure the auto power off feature.

7. Functions by Optional Devices Connection

Connecting Optional Devices Overview

Overview of connecting optional devices like AC adapter, printer, etc.

AC Adapter Connection

Instructions for connecting the optional AC adapter.

Analog Output Cable Connection

Instructions for connecting the analog output cable.

External Printer Cable Connection

Instructions for connecting the external printer cable.

RS-232 C Connection Cable

Instructions for connecting the RS-232C cable to a PC.

7.2 Printing Function by External Printer

Printing Calibrated Values

How to print calibrated values automatically after calibration.

Printing Measured Values

Methods for printing measured values (auto hold, interval, manual).

Printing Stored Memory Data

How to print stored memory data.

7.3 RS-232 C Communication Function

RS-232 C Communication Format

Details the communication format for RS-232C interface.

7.4 Connection of Recorder

Analog Output Cable Connection

Steps for connecting the analog output cable.

Analog Output Specifications

Electrical specifications for the analog output.

Analog Output Cable Wiring

Pinout and wiring details for the analog output cable.

8. Maintenance and Inspection

Instrument Body Maintenance

Guidelines for cleaning and maintaining the instrument body.

Turbidity Sensor Maintenance

Instructions for cleaning and maintaining the turbidity sensor.

Battery Replacement Period

Information on when to replace the instrument's batteries.

9. Troubleshooting

Safety Precautions for Abnormalities

Safety measures to take if an abnormality occurs.

Error Display Explanations

Explains error codes and their meanings.

Other Troubles and Countermeasures

Lists common problems and their solutions.

System Reset Procedures

Procedures for resetting the instrument to factory settings.

10. Transport, Storage, and Disposal

Instrument Transport

Guidelines for safely transporting the instrument.

Instrument Storage

Recommended conditions for storing the instrument.

Instrument Disposal

Guidance on how to dispose of the instrument and reagents.

11. Parts;Options List

TOA-DKK TB-31 Specifications

General

Brand	TOA-DKK
Model	TB-31
Category	Measuring Instruments
Language	English

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TOA-DKK TB-31 - User Manual

Table of Contents

Questions and Answers

Summary

Introduction

Optional Device Connectivity

Safety Information

Meaning of Markings

Safety Compliance Items

General Safety Precautions

Warranty

Warranty Coverage

Limited Warranty Conditions

Reading Guide

1. Content of Package

2. Specifications and Functions

Product Specifications

Instrument Functions

3. Name and Function of Each Part

Main Body and Operation Panel

Display Screen Elements

Turbidity Sensor (Model ELL-011)

4. Preparations

Loading the Batteries

Protective Cover Handling

Turbidity Sensor Connection

Turbidity Sensor Preparation

5. Basic Operation

Operation Screens Map

Powering On the Instrument

Setting the Date and Time

Calibration Data Management

Performing Calibration

Measurement Procedures

6. How to Use Various Functions

Auto Hold Function

Data Memory Function

Interval Function

Display Range Switching

Measurement Unit Setting

Response Setting

Temperature Calibration

Memory Overwrite Setting

Buzzer On;Off Setting

Auto Power Off Setting

7. Functions by Optional Devices Connection

Connecting Optional Devices Overview

AC Adapter Connection

Analog Output Cable Connection

External Printer Cable Connection

RS-232 C Connection Cable

7.2 Printing Function by External Printer

Printing Calibrated Values

Printing Measured Values

Printing Stored Memory Data

7.3 RS-232 C Communication Function

RS-232 C Communication Format

7.4 Connection of Recorder

Analog Output Cable Connection

Analog Output Specifications

Analog Output Cable Wiring

8. Maintenance and Inspection

Instrument Body Maintenance

Turbidity Sensor Maintenance

Battery Replacement Period

9. Troubleshooting

Safety Precautions for Abnormalities

Error Display Explanations

Other Troubles and Countermeasures

System Reset Procedures

10. Transport, Storage, and Disposal

Instrument Transport

Instrument Storage

Instrument Disposal

11. Parts;Options List

TOA-DKK TB-31 Specifications

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