Mettler Toledo Conductivity Standards
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Mettler Toledo Conductivity Standards

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Mettler-Toledo GmbH
SKU Value Pack Size Weight (In Grams) Price (excluding VAT) Availability Qty To Purchase
Mettler Toledo Conductivity Standards 51300169 10 µs 250 ml Bottle 100 £96.90 Contact Us for Exact Information
Mettler Toledo Conductivity Standards 51300170 500 µS 250 ml Bottle 100 £36.70 85 + -
Mettler Toledo Conductivity Standards 51302153 84 µs 250 ml Bottle 100 £48.80 5 + -
Mettler Toledo Conductivity Standards 30094617 5 µS 250 ml Bottle 100 £145.50 1 + -
Mettler Toledo Conductivity Standards 30090847 1.3 µS 250 ml Bottle 100 £188.50 37 + -
Mettler Toledo Conductivity Standards 51302050 12.88 ms 30 x 20ml Sachets 400 £64.90 Contact Us for Exact Information
Mettler Toledo Conductivity Standards 51302049 1413 µs 30 x 20ml Sachets 400 £64.90 Contact Us for Exact Information

A conductivity standard is a reference solution of a known conductivity value that is used for sensor calibration or verification. Using the correct conductivity standard solution when preparing to perform a conductivity measurement is important for accuracy. Select from our complete portfolio of conductivity standards covering the entire conductivity range, even when working with low-conductivity samples. To minimize the risk of contamination, choose between small bottles and single-use sachets.

All METTLER TOLEDO's conductivity calibration and verification standards are traceable to certified international standard SRM NIST.

FAQs 

What is a conductivity standard used for?

A conductivity standard is used for calibration or verification. A low conductivity standard requires special handling and is mainly used for verification purposes. Additionally, the low conductivity standard is directly affected by CO2 when in contact with air. Thus, they have a shorter shelf life and require protection with inert gas or the usage of a flow cell. These types of conductivity standards are only intended for verification and not calibration. 

Is the 10 µS/CM conductivity standard appropriate for calibration?

METTLER TOLEDO offers certified standard solutions with a conductivity of 10 μS/cm and lower. These standards are only intended for checking the reading of low conductivity measurements because they are easily affected by any mishandling.10 μS/cm conductivity standard is highly vulnerable and is directly affected by contamination or influence of CO2 when in contact with air. Due to this high likelihood of a quick value change, it is intended only for measurement verification and not calibration. 

 

Which conductivity standard should I use when measuring low conductivity values?

The 84 μS/cm standard should be used for the best accuracy of low conductivity calibrations. The consistent linearity of METTLER TOLEDO measuring systems between 84 μS/cm and low conductivity values provides much better accuracy than is typically obtained by using standard solutions with a conductivity below 84 μS/cm.We always recommend calibrating with a 84 μS/cm conductivity standard and checking with the 10 μS/cm standard, even when measuring in very low conducting media such as pure water.

Conductivity standards of 10 μS/cm and lower can only be used for one calibration or verification right after opening. 84 μS/cm standard should be used within one day after opening. 

How should low conductivity readings be performed?

Equipment

Measurements of samples with conductivity values lower than 10 μS/cm need special equipment and procedures. First, a two-pole cell featuring a low cell constant (0.01– 0.1 cm-1) is needed. InLab® Trace and InLab 741//742 are specially designed for these requirements.  

Measurement Arrangement

CO2 from the atmosphere greatly influences the conductivity measurement at this low level. To get reliable conductivity results below 10 μS/cm, the follow­ing two approaches are recommended:

  • Inert gas:

The sample is protected by an inert gaseous layer of nitrogen or argon to prevent contamination from the atmosphere. This allows the use of normal dip cells to measure samples in the range of 1 to 10 μS/cm.

  • Flow cell:

A closed system, like a flow cell, eliminates the influence of CO2. This is the best practice to measure samples with a conductivity value lower than 10 μS/cm. However, samples with higher con­ductivities may also be measured in this manner. For non-pressurized samples, flow cells can be used with a peristaltic or a membrane pump, given that they are completely sealed systems. With other types of pumps, the sample or standard comes into contact with the pump, which can lead to contamination and erroneous readings. For sample and standards, the flow must not introduce any air bubbles.

    • Weight (In Grams)
      100 g
    • SKU
      51300170
    • Commodity Codes
      2827398590
  • Manufacturer
    Mettler-Toledo GmbH
  • Country of Origin
    Ireland
  • Value
    10 µs, 84 µs, 500 µS, 12.88 ms, 1413 µs, 5 µS, 1.3 µS
  • Pack Size
    250 ml Bottle, 30 x 20ml Sachets, 6 x 250ml Bottles, 10 x 20ml Sachets

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