Honeywell UDA2182 manual Cation Calc Display, UDA for Cation and Degassed CO2 How it works

Operating the Analyzer

5.9 Cation Calc Display

5.9.1Overview

This group allows you to configure dual conductivity inputs for cation or degassed CO2 measurement. The cation selection of Ammonia or Amines will display a calculated pH value from differential conductivity and provide continuous pH monitoring using reliable, maintenance free conductivity cells. An outline of the conductivity cells’ installation is illustrated in Figure 5-6.

Cell

#1

Inlet

Flow Valve

Cation Exchange Column

Flow

Meter

Cell

#2

Gasses

Cell #3

Reboiler

Drain

Specific	Cation	Degassed
Conductivity	Conductivity	Conductivity
From Cell #1	From Cell #2	From Cell #3

UDA for Cation Conductivity UDA for Degassed CO2

Figure 5-6 UDA for Cation and Degassed CO2

5.9.2How it works

UDA2182 will monitor on-line treated water for Specific Conductivity and Cation bed discharge conductivity, using reliable and maintenance free Honeywell conductivity cells, and calculate the pH, using the assumption that the water is pure water with Amine type treatment chemical and residual trace un-removed salts.

pH Calculation from Cation and Specific Conductivity

The equipment consists of Cell #1 which is used for specific conductivity determination of the influent water sample. The water sample is then passed through a strong acid cation exchange resin which replaces all cations in the influent stream with hydrogen ion. On passing though the resin, a second Cell #2 is used to measure the effluent or cation conductivity. These two measurements in combination are useful for measuring the amount of base contained in the influent sample and the extent of contamination by unwanted salts such as sodium chloride, sodium sulfate, etc.

January 2009 UDA2182 Universal Dual Analyzer Product Manual 37