Velp Scientifica TB1 Instruction Manual
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Velp Scientifica TB1 Instruction Manual

Portable turbidimeter
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Instruction Manual
TB1
Portable Turbidimeter

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Summary of Contents for Velp Scientifica TB1

  • Page 1 Instruction Manual Portable Turbidimeter...
  • Page 2 Preface This manual functions in two ways: first as a step by step guide to help you operate the waterproof TB1 turbidimeter; second, it serves as a handy reference guide. It contains basic instructions that you must follow during the operation, care and maintenance of the instrument.

  • Page 3: Table Of Contents

    Velp Scientifica –TB1 Manual TABLE OF CONTENTS OVERVIEW Unpacking TB1Meter and Accessories Display Keys and Functions Battery Installation TURBIDITY CALIBRATION Indexing Calibration Standards Preparing the standard vials Calibration Procedure Restoring Factory Calibration TURBIDITY MEASUREMENT General Information Turbidity Measurement Procedure 3.2.1 Preparation of Sample Vial 3.2.2...

  • Page 4: Overview

    Velp Scientifica –TB1 Manual 1 OVERVIEW Thank you for selecting the waterproof portable TB1 turbidimeter. The TB1 allows you to measure turbidity of an aqueous sample in the field. This instrument operates nephelometric principle turbidity measurement and is designed to meet the criteria specified in ISO 7027 and DIN 27027 standards (see 8.3...

  • Page 5: Display

    Index Mark Liquid Crystal Display Keypad Figure 1: Parts of TB1 Turbidimeter 1.2 Display All the LCD segments and annunciators that can appear on the display are shown in Figure 2. The display is used for reporting the turbidity reading and to provide guidance for the operation of the instrument.

  • Page 6: Keys And Functions

    Velp Scientifica –TB1 Manual 1.3 Keys and Functions The keypad has five keys: ON/OFF, CAL, ▲, ▼, and READ/ENTER. Keys Functions ON/OFF Powers on and shuts off the meter. With the auto switch-off feature the meter automatically shuts off 20 minutes after last key press.

  • Page 7: Battery Installation

    Velp Scientifica –TB1 Manual 1.4 Battery Installation Four AAA-sized batteries are included in your meter’s packaging: 1. Use a Philips screwdriver to remove the two screws holding the battery cover. See Figure 3. 2. Remove the battery cover. 3. Insert the batteries. Follow the diagram inside the cover for correct polarity.

  • Page 8: Turbidity Calibration

    Velp Scientifica –TB1 Manual 2 TURBIDITY CALIBRATION The TB1 turbidimeter was calibrated and tested prior to leaving the factory. Therefore, it is possible to use the instrument directly out of the box. However, re-calibration of the instrument is recommended to help you become familiar with the operation of the instrument and the calibration procedures.

  • Page 9: Preparing The Standard Vials

    Velp Scientifica –TB1 Manual instrument. The SDVB Calibration standards offered are more stable than Formazin and have a shelf life until the expiration date on the plastic bottle. These are primary standards that meet the regulatory requirements for reporting for ISO and US EPA.

  • Page 10: Calibration Procedure

    800 NTU, down to lowest standard, 0.02 NTU. See Section 2.3 “Preparing the standard vials” prior to starting the calibration. 1. Place the TB1 turbidimeter on a flat and level surface. 2. Select the calibration function of the instrument by pressing the CAL button once.
  • Page 11 Velp Scientifica –TB1 Manual CAL 3 Place the next CAL 3 standard into the Flashes about CAL 3 sample well 5 times 20.0 NTU CAL 1 READ ENTER CAL 3 CAL 1 800 NTU Flashes about 10 times or more...

  • Page 12: Restoring Factory Calibration

    Velp Scientifica –TB1 Manual 2.5 Restoring Factory Calibration The TB1 turbidimeter allows you to reset the meter back to the factory default calibration values. This feature is extremely useful when there are errors in calibration or when you have new calibration standards.
  • Page 13 Velp Scientifica –TB1 Manual METER OFF Press ON/OFF keys simultaneously and hold for 2 seconds before releasing Press DOWN key to select To retain last To restore factory READ READ calibration values calibration without retrieving ENTER ENTER factory calibration. [-Rd-] will flash 10 times...

  • Page 14: Turbidity Measurement

    Velp Scientifica –TB1 Manual 3 TURBIDITY MEASUREMENT 3.1 General Information The waterproof TB1 turbidimeter allows you to measure the turbidity of a grab sample. The turbidity is reported in Nephelometric Turbidity Units (NTU). Readings above 1000 NTU are outside the range of this instrument.

  • Page 15: Preparation Of Sample Vial

    Velp Scientifica –TB1 Manual 3.2.1 Preparation of Sample Vial 1. Grab liquid with the plastic bottle provided. 2. Obtain a clean and dry sample vial (Figure 7). 3. Take care to handle the sample vial by the top. 4. Rinse the vial with approximately 10 ml of the sample water, capping the vial with the black screw cap and gently inverting it several times.

  • Page 16: Measurement Procedure

    Velp Scientifica –TB1 Manual 3.2.2 Measurement Procedure 1. Place TB1 turbidimeter on a flat and level surface. 2. Place the sample vial inside the sample well and align the vial’s mark with the meter’s index mark. See below Light shield cap for...

  • Page 17: Single-Shot Or Continuous Measurement

    3.3 Single-Shot or Continuous Measurement You can use TB1 turbidimeter to take a single reading or perform continuous measurement. The latter is only used for indexing the vials. See Section 0 - 8.5 Indexing a Vial on page 21 for more information.
  • Page 18 Velp Scientifica –TB1 Manual For continuous measurement: 1. Make sure the meter is sitting on a flat and level surface and is in measurement mode. The display shows the last measured value or [STbY]. 2. Place the sample vial in the sample well.

  • Page 19: Troubleshooting Guide

    Velp Scientifica –TB1 Manual TROUBLESHOOTING GUIDE The TB1 turbidimeter routinely performs self-diagnostics, and will automatically generate messages to provide you with specific diagnostic information. These messages are for your use and do not indicate a reduction in the performance of the instrument or a failure of any component in the instrument, unless otherwise stated in this list.

  • Page 20: Routine Maintenance

    Velp Scientifica –TB1 Manual 5 ROUTINE MAINTENANCE The supplied carrying case is optimal for protecting the instrument. If you do not plan on leaving the instrument in the supplied carrying case, when not in use, ensure that the instrument has been turned off and that a clean sample vial fitted with a black cap has been placed in the sample well.

  • Page 21: Accessories

    Velp Scientifica –TB1 Manual 6 ACCESSORIES The items shown below are recommended accessories and replacement parts for the instrument. Description Code Waterproof TN-100/ T-100 portable turbidimeter with set of 4 R109B12150 calibration standards (800, 100, 20.0 & 0.02 NTU), set of 3 sample vials, lint-free cloth, silicone oil, batteries –...

  • Page 22: Specifications

    Velp Scientifica –TB1 Manual 7 SPECIFICATIONS Model No. Measurement Method ISO 7027 compliant nephelometric method (90°) Measurement Range 0 to 1000 NTU 0.01 – 19.99 NTU Automatic Range Selection 20.0 – 99.9 NTU 100 – 1000 NTU 0.01 NTU (0 – 19.99 NTU) Resolution 0.1 NTU (20 –...

  • Page 23: Addendum 1: Turbidity

    (5) Distance traversed by incident light and scattered light within the sample; (6) Calibration standard. The TB1 turbidimeter follows the ISO 7027 standard whose specification allows for greater reproducibility of the measured values and greater agreement between other measuring instruments.

  • Page 24: Nephelometric Turbidity Units (Ntu)

    Velp Scientifica –TB1 Manual Figure 13 shows the waterproof TB1 turbidimeter basic optical system. It includes a light source and a detector to monitor the light scattered at 90° with respect to the incident beam. Scattered Light 90° Transmitted Light...

  • Page 25: Addendum 2: Guide To Good Measurement Technique

    Velp Scientifica –TB1 Manual 9 ADDENDUM 2: GUIDE TO GOOD MEASUREMENT TECHNIQUE Turbidity is a very complex analytical measurement which can be affected by many factors. Some are inherent in the instrument’s design such as angle of detection, light beam aperture, incident beam wavelength and colour sensitivity of the photocell.

  • Page 26: Degassing

    Velp Scientifica –TB1 Manual 9.3 Degassing Air or other trapped gases should be removed before measurement. Degassing is recommended even if no bubbles are visible. There are three methods commonly used for degassing:  Addition of a surfactant: This involves adding a surfactant to the water samples to lower the surface tension of the water, thereby releasing trapped gasses.

  • Page 27: Calibration

    Velp Scientifica –TB1 Manual 9.6 Calibration 1. Do not open the vials with calibration standards. 2. Check that the standards have not expired. 3. Make sure the calibration vials are free of dust, smudges and scratches before use. 4. Conduct the calibration in the same manner each time. Variations in how calibration is performed could yield inaccurate measurements.

  • Page 28: Warranty

    Velp Scientifica –TB1 Manual 10 WARRANTY The TB1 meter is supplied with a 2-year warranty from manufacturing defects and calibration standards for 6 months. If repair or adjustment is necessary and has not been the result of abuse or misuse within the designated period, please return – freight pre-paid –...
  • Page 29 Velp Scientifica –TB1 Manual 11. Calibration checklist Month _________________ Year ______________ Date Initials Value Standard Comments...
  • Page 30 Velp Scientifica –TB1 Manual Month _________________ Year ______________ Date Initials Value Standard Comments...
  • Page 31 Velp Scientifica –TB1 Manual Declaration of conformity the manufacturer VELP SCIENTIFICA s.r.l. Address Via Stazione, 16 20865 USMATE (MB) Italy under our responsibility declare that the product is manufactured in conformity with the following standards: EN 61326-1: 2013 and satisfies the essential requirements of the following directives:...
  • Page 32 Your authorized agent: Velp Scientifica srl 20865 Usmate (MB) - Italy Via Stazione, 16 tel. +39 039 628811 fax +39 039 6288120 e-mail: inse@velp.it Internet: www.velp.com...

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