Honeywell UDA2182 manual Calibration, 5 CO2 by Degassed Conductivity, Access to Cation Display

Operating the Analyzer

Note: The relationship between the electrolytic conductivity and the pH of ammonia and amines is well established in the technical literature. It must be understood that the UDA was designed for accurate results over the pH range of 8 to 10.5 based on ammonia or amine chemistries. Other chemistries such as phosphate or systems that employ alternative anions, such as borate, cannot be expected to realize results with similar accuracy.

Standardization for cations

The UDA allows for a sample calibration of the cation pH value. Here an independent sample is withdrawn from the sampling equipment and pH is determined with equipment of known accuracy. This independent pH value is then entered into the UDA as a pH calibration constant. To avoid process pH changes during standardization, it is very desirable to complete the sample extraction, independent measurement and UDA update as soon as possible.

5.9.4Calibration

For Calibration procedure, refer to Section 8.7.7 Cation pH Calibration.

5.9.5CO2 by Degassed Conductivity

The UDA can be configured for CO2 determination by degassed conductivity. The cation conductivity cell is connected to Input 1 and the degassed sample conductivity cell is connected to channel 2. The UDA performs HCl temperature compensation of both measurements to 25°C. The difference between the cation and degassed 25°C values is taken and ppb CO2 is determined by ASTM D 4519.

5.9.6Access to Cation Display

•When Cation Calc is enabled (See Section 6.18 – Maintenance Configuration), press Display until you see:

Relay 1 Physical State

White – De-energized

Black - Energized**

Specific Conductivity

Output 1 Bar graph

Output 2 Bar graph

PV 2 Value

Relay 2 Physical State White – De-energized

PV 1 Value PV 1 Temperature

1	CATION CALC		3
	3.772 µS/cm	28.4 ºC
	Specific NH3
	9.13
	0.099 µS/cm	24.1ºC
	Cation HCl
2			4

Relay 3 Physical State

White – De-energized

Black - Energized**

Calculated Water pH

Output 3 Bar graph

PV 2 Temperature

Black - Energized**

Cation Conductivity	Relay 4 Physical State
	White – De-energized
	Black - Energized**

Figure 5-7 Cation Display screen example for pH calculations

January 2009 UDA2182 Universal Dual Analyzer Product Manual 39