Honeywell UDA2182 Conductivity Calibration, Entering the Cal Factor for each cell Introduction

Input Calibration

8.7 Conductivity Calibration

8.7.1Introduction

Each type of cell has an associated cell constant entered during Configuration setup (see Section 6.6). This number is part of the cell model number. However, for greater precision, every Honeywell cell is individually tested at the factory, and a calibration factor unique to that cell is determined. The cal factor for a cell can be found on the plastic tag hanging from the cell lead wires. Instructions for entering this cell cal factor are in Section 6.6. The UDA automatically uploads the Cal Factor from Honeywell DL4XXX type cells. This value is displayed in the “Setup” menu.

For some conductivity applications even greater accuracy is required. For those applications it is possible to perform a calibration trim procedure. The Analyzer’s reading can be adjusted while the associated cell is measuring a reference solution of known conductivity, as described in Table 8-9. 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 conductivity of the process. In this case the process fluid becomes the “reference solution”.

Calibration trim is recommended for acid concentration applications above 5%. Calibration trim can be removed as described in this section.

For accurate measurement of total dissolved solids (TDS) a conversion factor is entered for each cell as described in Table 6-5 (Input1, Input 2, Conductivity).

8.7.2Entering the Cal Factor for each cell

Introduction

Each type of cell has an associated cell constant; this number is part of the cell model number. The constant for each cell is entered during Input setup. However, for greater precision, every Honeywell cell is individually tested at the factory, and a calibration factor unique to that cell is determined. The cal factor for a cell can be found on the plastic tag hanging from the cell lead wires.

Procedure

If you have not done so already, refer to Table 6-5 (Input1/Input2/Conductivity) to enter the cal factor for each cell

8.7.3 Determining and Entering the TDS Conversion Factor

Introduction

The UDA2182 measures conductivity. However, the process value can be displayed in terms of total dissolved solids (TDS). If a TDS PV type was specified during Input setup (Section 6.6), then the same menu in will contain an entry for the TDS conversion factor for each cell.

January 2009 UDA2182 Universal Dual Analyzer Product Manual 157