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TPS 90-FL - User Manual

TPS 90-FL
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Congratulations !
The 90-FL is complete water quality logger in a single portable unit. It combines Dissolved
Oxygen, Conductivity, TDS, pH and Temperature.
Despite its impressive list of features, the 90-FL is a breeze to operate. This manual has been
designed to help you get started, and also contains some handy application tips. If at any stage you
require assistance, please contact either your local TPS representative or the TPS factory in
Brisbane.
The manual is divided into the following sections:
1. Table of Contents
Each major section of the handbook is clearly listed. Sub-sections have also been included to
enable you to find the information you need at a glance.
2. Introduction
The introduction has a diagram and explanation of the display and controls of the 90-FL. It
also contains a full listing of all of the items that you should have received with unit. Please
take the time to read this section, as it explains some of items that are mentioned in subsequent
sections.
3. Main Section
The main section of the handbook provides complete details of the 90-FL, including operating
modes, calibration, troubleshooting, specifications, and warranty terms.
4. Appendices
Appendices containing background information and application notes are provided at the back
of this manual.
TPS Pty Ltd
4 Jamberoo Street
Springwood, Brisbane,
Australia, 4127
Phone : (07) 32 900 400
International : 61 7 32 900 400
Fax : (07) 3808 4871
International : 61 7 3808 4871
E-mail : tps@tps.com.au
Web Site : www.tps.com.au
90-FL
Dissolved Oxygen,
Conductivity, TDS, pH,
Temperature Logger
Date : 01-Feb-2001
Author : MS
Version : 6.0

Table of Contents

Questions and Answers

  • J
    jennifer22Nov 25, 2025
    Why are the readings unstable on my TPS Measuring Instruments?
    • N
      Nina OlsenNov 25, 2025
      Unstable readings on your TPS Measuring Instruments meter can occur for several reasons: * The reference electrolyte chamber may need refilling; refill it with saturated KCl filling solution. * The reference junction could be blocked; clean it as per instructions supplied with the electrode. * The pH glass bulb might not be clean; clean the glass bulb or platinum tip as per instructions supplied with the electrode. * There might be a bubble in the pH glass bulb; flick the electrode to remove the bubble. * There could be a faulty connection to the meter; check connectors and replace if necessary. * The reference junction might not be immersed; ensure it is fully immersed. * There could be KCl crystals around the reference junction inside the electrolyte chamber; rinse the el...
  • D
    dunlapmariaAug 25, 2025
    What to do if the TPS Measuring Instruments shows a flashing symbol?
    • S
      Stephanie MurphyAug 25, 2025
      If your TPS Measuring Instruments meter displays a flashing symbol, it means the battery is below 5.60 volts. Recharge the battery. A full charge will take approximately 18 hours.
  • C
    chelsey29Aug 25, 2025
    How to fix a TPS 90-FL that is not charging?
    • J
      Jack DayAug 26, 2025
      If the battery of your TPS Measuring Instruments meter doesn't charge when the charger is connected, it could be due to a faulty battery charger or a faulty battery. Connect the charger and switch the power on. Display the battery volts in the battery saver menu. If the battery volts are increasing, then the charger is OK. If the battery volts do not increase, then the charger is faulty. Replace the charger or the battery, as required.
  • C
    Chelsea Williams MDAug 27, 2025
    Why does my TPS 90-FL Measuring Instruments meter display OFF and switch off?
    • A
      Alexis CaseAug 27, 2025
      If your TPS Measuring Instruments meter displays 'OFF' and switches off, the battery is likely below 5.10 volts. Recharge the battery. If this doesn't solve the problem, check the charger. If the charger is working correctly, replace the battery.
  • M
    Mr. Derrick RodgersAug 28, 2025
    Why are the readings inaccurate on my TPS 90-FL Measuring Instruments, even after calibration?
    • H
      Hannah JonesAug 28, 2025
      If you're getting inaccurate readings on your TPS Measuring Instruments meter even after a successful calibration, the reference junction could be blocked. Clean the reference junction as per the instructions supplied with the electrode.
  • M
    Mark LopezSep 15, 2025
    Why won't my TPS 90-FL calibrate, even with a new probe?
    • H
      Heidi KirkSep 15, 2025
      If your TPS Measuring Instruments meter won't calibrate, even with a new probe, check that the k factor is set correctly when not using a TPS k=10 sensor. You can also try to initialize the unit.
  • E
    Erik PetersonSep 13, 2025
    Why does my TPS 90-FL Measuring Instruments display a constant pH reading of 7.00?
    • A
      Angela LaraSep 13, 2025
      If your TPS Measuring Instruments meter displays a constant reading around pH 7.00 for all solutions, there may be an electrical short in the connector. Check the connector and replace it if necessary. If the problem persists, replace the electrode.
  • K
    Katherine BallardSep 14, 2025
    Why are the readings inaccurate on my TPS 90-FL even after successful calibration?
    • N
      nguyenjimmySep 14, 2025
      If you're getting inaccurate readings on your TPS Measuring Instruments meter even after a successful calibration, it could be due to a build-up of dirt or oily material on the electrode plates of the sensor, or the platinum-black coating has worn off. Clean the sensor. The sensor may require replatinization or return to the factory for replatinization.
  • K
    Krystal ThomasSep 6, 2025
    Why does my TPS 90-FL attempt span calibration instead of zero calibration?
    • Z
      Zachary SchneiderSep 6, 2025
      If your TPS Measuring Instruments meter attempts span calibration instead of zero calibration, the sensor has a zero error. Thoroughly rinse the sensor in distilled water and allow it to completely dry in air before attempting zero calibration.
  • E
    Elizabeth ReillySep 3, 2025
    What causes standard calibration failures with high k factor on TPS 90-FL?
    • E
      Eric MuellerSep 3, 2025
      A standard calibration failure with a k factor greater than 25% above the nominal value on your TPS Measuring Instruments meter can be caused by: * The sensor not being immersed correctly; immerse sensor correctly as per diagrams. * A build-up of dirt or oily material on electrode plates; clean sensor as per the instructions. * A worn-off platinum-black coating; sensor requires replatinization or return to the factory for replatinization. * Inaccurate standard solution; replace standard solution. * A faulty sensor. * A faulty instrument.

Summary

1. Introduction

1.1 90-FL Display and Controls

Details the physical layout and interactive elements of the 90-FL unit's front panel.

1.10 Specifications

Provides detailed technical specifications for the 90-FL instrument's various functions.

3. Dissolved Oxygen Mode

3.1 Selecting Dissolved Oxygen Mode

Guides on how to choose the desired units for Dissolved Oxygen readings.

3.2 Dissolved Oxygen Calibration

Details the process for calibrating the sensor using zero and span standards, including air and solution methods.

3.5 Dissolved Oxygen Stirrer

4. Conductivity Mode

4.1 Selecting Conductivity Mode

4.2 Setting the Conductivity calibration standard

Explains how to input the standard solution value for Conductivity calibration.

4.3 Setting the Conductivity sensor k factor

Details how to select the correct k factor for different Conductivity sensors.

4.4 Conductivity Calibration

Outlines the steps for performing zero and standard calibrations for Conductivity measurements.

5. TDS Mode

5.1 Selecting TDS Mode

5.2 Setting the TDS calibration standard

Explains how to input the standard solution value for TDS calibration.

5.3 Setting the TDS sensor k factor

Details how to select the correct k factor for different TDS sensors.

5.4 TDS Calibration

Outlines the steps for performing zero and standard calibrations for TDS measurements.

6. pH Mode

6.1 Selecting the pH Buffer Set

6.2 pH Calibration

Outlines the procedure for performing pH calibration using buffer solutions.

7. Temperature Mode

7.1 Temperature Calibration

Details the process for calibrating the temperature sensor for accurate readings.

7.4 Manual Temperature Setting

8. Good Laboratory Practices (GLP)

8.1 To recall GLP information on the display

9. Datalogging

9.1 Setting the A & B Data Input Function

9.2 Manually Recording Readings into the Logger

Details the process for manually saving measurements, including different A&B data input configurations.

9.3 Automatic Datalogging

Explains the different modes for automatic data logging: Rate per Day, Time of Day, and Sampling Period.

9.4 Recalling Readings from the Logger

10. RS232 Port

10.1 Setting the Baud Rate

10.5 Commands

10.8 Importing Data into Microsoft Excel

12. Initialising the 90-FL

14. Battery Saver Function

16. Troubleshooting

16.1 General Errors

Lists common error messages, their causes, and remedies for general issues.

16.2 Dissolved Oxygen Troubleshooting

Provides solutions for specific problems encountered with Dissolved Oxygen measurements.

16.3 Conductivity; TDS Troubleshooting

Offers solutions for problems related to Conductivity and TDS sensor calibration and readings.

16.4 pH Troubleshooting

Provides solutions for specific issues encountered with pH measurements and calibration.

16.5 Temperature Troubleshooting

Lists troubleshooting steps for temperature measurement inaccuracies.

18. Warranty

TPS 90-FL Specifications

General IconGeneral
BrandTPS
Model90-FL
CategoryMeasuring Instruments
LanguageEnglish

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