Overview of CLS21E Conductivity Meter Spare Parts List

The CLS21E is a commonly used conductivity measurement instrument in industrial processes, and its spare parts management is crucial for maintaining measurement accuracy. This article provides the spare parts list for this instrument, highlighting the order numbers, descriptions, recommended grades, and classification information of five calibration solutions. All calibration solutions come with temperature compensation tables to ensure traceable calibration results.

The following content is intended for engineering technicians, maintenance personnel, and procurement staff to assist in quick selection and purchasing.

Comparison of Calibration Solution Specifications and Parameters

The CLS21E is equipped with five calibration solutions, with order numbers ranging from 50081902 to 50081906. They all use NIST SRM as the reference standard and are suitable for calibration of conductivity measurement systems compliant with ISO standards. The table below summarizes the key parameters for easy comparison and selection.

Order Number Description Recommended Grade Position Group Valid
50081902 Calibration solution 74.0 uS/cm 500 ml, reference temperature 25°C. Precision solution, traceable to NIST SRM. Comes with temperature table for calibration of conductivity measurement systems compliant with ISO standards. A Unclassified - -
50081903 Calibration solution 500 ml, reference temperature 25°C. Precision solution, traceable to NIST SRM. Comes with temperature table for calibration of conductivity measurement systems compliant with ISO standards. A Unclassified - -
50081904 Calibration solution 1.406 mS/cm 500 ml, reference temperature 25°C. Precision solution, traceable to NIST SRM. Comes with temperature table for calibration of conductivity measurement systems compliant with ISO standards. A Unclassified - -
50081905 Calibration solution 500 ml, reference temperature 25°C. Precision solution, traceable to NIST SRM. Comes with temperature table for calibration of conductivity measurement systems compliant with ISO standards. A Unclassified - -
50081906 Calibration solution 500 ml, reference temperature 25°C. Precision solution, traceable to NIST SRM. Comes with temperature table for calibration of conductivity measurement systems compliant with ISO standards. A Unclassified - -

Note: All calibration solutions are marked as "Unclassified", indicating they are not assigned to a specific application group, but the recommended grade is Grade A, suitable for high-precision calibration scenarios.

Calibration Solution Selection Recommendations

When selecting a calibration solution, determine the appropriate conductivity value based on the actual measurement range. The following are key selection points:

  • Low conductivity measurement: If the measurement range is 0-100 µS/cm, order number 50081902 (74.0 µS/cm) is recommended.
  • Medium conductivity measurement: If the measurement range is 100 µS/cm to 2 mS/cm, order number 50081904 (1.406 mS/cm) is recommended.
  • General calibration: Order numbers 50081903, 50081905, and 50081906 do not specify conductivity values and may be other concentrations or custom solutions; confirm based on actual needs.

All calibration solutions come with temperature compensation tables. During use, calibrate at the reference temperature of 25°C to comply with ISO standards.

Usage and Storage Precautions

To ensure the performance of the calibration solutions, follow these operating guidelines:

  1. Check the bottle label before use to confirm the order number matches the required conductivity value.
  2. During calibration, ensure the calibration solution temperature is stable near 25°C and compensate according to the temperature table.
  3. Avoid contaminating the calibration solution; seal immediately after use and store in a cool, dark place.
  4. Replace the calibration solution regularly; use within the expiration date and consume as soon as possible after opening.

If spare parts need to be purchased, please provide the order number directly to ensure the correct model is obtained.

Frequently Asked Questions

Can the calibration solution be reused?

Reuse is not recommended. The calibration solution may introduce contaminants after contacting the electrode, affecting calibration accuracy. It is recommended to use fresh solution for each calibration.

How to confirm if the calibration solution has expired?

The calibration solution bottle usually has an expiration date. If not marked, it is recommended to use within 6 months after opening. The conductivity value of expired solution may drift, causing calibration errors.

Are these calibration solutions suitable for other conductivity meters?

Yes. These calibration solutions are traceable to NIST SRM and come with temperature compensation tables, suitable for most conductivity measurement systems compliant with ISO standards, including CLS21E and other brand instruments.