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home Best Technology / Precision Cleaning Systems & Parts Cleaners / What is Total Dissolved Solids or TDS in water for parts cleaning?

What is Total Dissolved Solids or TDS in water for parts cleaning?

What is TDS in water? Total dissolved solids (TDS) is the term used to describe the inorganic salts and small amounts of organic matter present in solution in water. These salts dissociate in water to form ions which means it has two parts: one with a positive charge and one with a negative charge, which separate and mix with the water (H20) molecules. This ionization allows for reading what the TDS is in the water via conductivity / resistivity which are discussed below.

The principal constituents are usually calcium, magnesium, sodium, and potassium cations and carbonate, chloride, sulfate, and nitrate anions. For example, sodium chloride (aka Table Salt) or NaCl is made up of sodium or Na positive charged ion and Chloride or Cl negative charged ion.  Other common salts that make up TDS in water are sodium Na+, sulfate SO42-, chloride (Cl-), calcium (Ca2+), magnesium (Mg2+), and bicarbonate (HCO3-).  All of these salts and minerals are found in varying levels based on the water source and the minerals in the surrounding soil.

(TDS) Total Dissolved Solids Measurement

Total dissolved solids in water are primarily measured by means of gravimetric and conductivity. Gravimetric is the most accurate and is usually done by evaporating the liquid water with TDS and measuring the mass of residues left. This method is generally the most accurate, although it is time-consuming and can’t not be done in process on part cleaning systems easily.

The concentration of dissolved ionized solids in the water is directly related to electrical conductivity / resistivity.   Ions from the dissolved solids in water create the ability for that water to conduct an electrical current which allows for in process measurement via a conductivity or TDS meter. Although not as accurate as gravimetric, the conductivity of water typically provides precise enough in process measuring for part cleaning and washing applications.

Measurement units for TDS: 1 grain of hardness = 17.12 mg/l or milligrams per liter = 17.12 ppm or parts per million.

Water can vary in TDS levels based purification method:

Municipal / City Source Water – maximum 1000 mg/l, but typically 140-400 mg/l

RO Water – 80-99% reduction of TDS from source water

DI Water – 99%+ reduction of TDS and often used in combination with RO

Article: Difference Between RO and DI Water for Parts Cleaning, Washing, and Rinsing

 

 

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Semi-Automated Inline Citric Passivation Solution with Data Tracking

For one medical device manufacturer, the design of a citric passivation solution faced two major challenges: The manufacturing process required performing a water-break test after cleaning parts, before proceeding to passivation. This meant that they could not use a fully automated passivation solution. The system had to have data tracking for quality control purposes. Semi-Automated […]

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  • Industrial Parts Washers
    ✛
    • Agitated Immersion Heated Parts Washers
    • Inline Conveyor Wash-Rinse-Dry Parts Washers
    • Immersion Inline Parts Washer
    • Spray Cabinet Parts Washers
      ✛
      • Front Load Spray Cabinet Parts Washer
      • Top Load Spray Cabinet Industrial Parts Washer
    • Vertical Door Pass Through Parts Washer
    • Rotary Drum Parts Washer
    • Powder Coat Prep Equipment
    • Phosphating Lines
    • Pipe Washing Equipment
  • Precision Cleaning Systems
    ✛
    • Applicable Articles
    • How clean is clean?
    • How Do Ultrasonic Cleaners Work?
    • Ultrasonic Benchtop Parts Cleaner
    • Benchtop Ultrasonic Parts Cleaning Multi-Tank Systems
    • Ultrasonic Cleaning Consoles
    • Automated Ultrasonic Parts Cleaning Equipment Wash-Rinse-Dry
    • Large Scale Automated Precision Aqueous Cleaning for Cellular Manufacturing
    • Agitated Immersion Ultrasonic Parts Washer
    • Machine Shop Parts Washer for Swiss and CNC Precision Parts
    • Immersible Ultrasonic Transducers
    • Vapor Degreasers
  • Passivation Equipment
    ✛
    • Applicable Articles
    • What is Passivation? How Does It Work?
    • Nitric vs. Citric Acid Passivation
    • CitriSurf – Citric Acid Passivation
    • Benchtop Ultrasonic Passivation Equipment
    • Ultrasonic Automated Passivation Equipment
    • Automated Ultrasonic Passivation System for Medical Device Parts
    • Passivation Wet Bench for Citric / Nitric Acid
    • Cleanroom Space Saving Automated Passivation System
    • Heated Polypropylene Acid Passivation and Rinse Tanks
    • Agitated Immersion Multi-Tank Passivation Systems
    • Automated Chemical Neutralization Tank / Cart
  • Electropolishing Equipment
    ✛
    • What is electropolishing? How does electropolishing work?
    • Electropolishing Cycle and Current Calculator
    • What is Dry Electropolishing? How does it work?
    • Passivation vs. Electropolishing
    • Table Top Electropolishing Equipment & Electropolishing Machines
    • Electropolishing Wet Benches
    • Large Scale Part Electropolishing Systems
    • Dry Electropolishing Machines
    • EP System – Open Top Wet Bench with Spray Rinse
  • Surface Finishing Systems
    ✛
    • Alodine Lines
      ✛
      • What is Alodine / Chem film / Chromate Conversion Coating?
      • Alodine Chem Film Tank Line
    • Mass Finishing Machines
      ✛
      • Centrifugal Barrel Finishing Machines
      • Spin Dryers / Chip Wringers
      • Vibratory Bowl Polishers
    • Titanium Anodizing Equipment
  • Wet Benches
    ✛
    • Citric / Nitric Passivation Wet Bench for Stainless Steel & Titanium
    • Electropolishing Equipment in a Wet Bench / Fume Hood
    • Fume Hoods
    • Wet Benches for Semiconductor & FM4910 Applications
    • Quick Dump Rinse Tank
  • Specialty & Custom Industrial Process Systems
    ✛
    • Automated Chemical Neutralization Tank / Cart
    • Vapor and Dryfilm PTFE Coating Systems
    • Heated Hot Air Parts Dryer
    • Solvent Recovery Equipment
  • Precision Cleaning Chemistries, Solvents & Fluids
    ✛
    • Why Use a Parts Cleaning Solvent?
    • 3M Novec Engineered Fluids, Fluorinert Liquids, Solvents & Chemicals
    • Solvent Cleaning with 3M Novec Engineered Fluids
    • Thermal Management / Heat Transfer with 3M Novec and Fluorinert Fluids
    • 3M Novec 72DA 73DE Solvent Vapor Degreaser For Medical Device Instruments
    • Solvent Phase-outs
      ✛
      • AK225 HCFC-225 Phase Out and Replacement with 3M Novec HFE Engineered Fluids
      • Medical Device AK 225 Replacement with 3M Novec Engineered Fluid Solvent
      • nPB Replacement
    • Aqueous Cleaning Chemistries
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    ✛
    • Industrial Parts Washer Case Studies
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    • Passivation Systems Case Studies
    • Part Finishing Equipment Case Studies
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