Calibration
8. Calibration
8.1 Overview
Introduction
Each type of cell has an associated cell constant entered during I/O setup (see Section 5). 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 8.3.
For some conductivity applications even greater accuracy is required. For those applications it is possible to perform a calibration trim procedure. The Analyzer/Controller’s reading can be adjusted while the associated cell is measuring a reference solution of known conductivity, as described in 8.4. The same procedure can be used to adjust the Analyzer/Controller’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 can be removed as described in 8.5
For accurate measurement of total dissolved solids (TDS) a conversion factor is entered for each cell as described in 8.6.
ATTENTION
Any time a cold reset is performed, the calibration trim and TDS values will be removed. The cal factor will be reset to match the cell constant.
What’s in this section?
The topics in this section are listed below.
Topic
8.1Overview
8.2Recommendations for Successful Measurement and Calibration
8.3Entering the Cal Factor for Each Cell
8.4Performing Calibration Trim
8.5Removing Calibration Trim Values
8.6Determining and Entering the TDS Conversion Factor
Calibration menu customized for different configurations
See Page
The choices available on the menu displayed when CALIBRATION is selected from the main menu depend on the choices made for solution temperation compensation during I/O setup (see Step 13 in Table
If neither cell’s solution temperature setup uses total dissolved solids (TDS), then the calibration menu contains the following choices:
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