Honeywell UDA2182 Instrukcja Użytkownika Pobierz pdf (Strona 171)

Input Calibration

January 2009 UDA2182 Universal Dual Analyzer Product Manual 159

8.7.5 Performing Calibration Trim

Introduction

For most applications entering the cal factor for each cell will achieve satisfactory system

performance. However, it is possible to perform a calibration trim procedure in which the

Analyzer and cell combination are used to measure a reference solution of known

conductivity; the reading of the Analyzer is adjusted to match.

The same procedure can be used to adjust the Analyzer’s reading while the cell is in the

process, if a reference instrument is used to determine the process conductivity. In this

case, the process fluid becomes the “reference solution”.

Calibration trim is recommended for acid concentration measurements above 5%.

Materials

To perform calibration trim using a standard reference solution, follow the instructions in

Table 8-9.

Materials required are:

• A reference solution of known conductivity near the point of interest, with the

temperature controlled (or measured and compensated) to within

± 1 °C.

Conductivities of potassium chloride solutions are provided in Table 8-8. Solutions

must be prepared with high-purity de-ionized, CO

-free water, and dried potassium

chloride.

• For acid concentration applications, a certified reagent grade solution with the

temperature controlled.

• A container for the reference solution, large enough to immerse the cell to measuring

depth.

• De-ionized water to rinse the cell.

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