Honeywell UDA2182 manual To Calculate True Value, Example Calculation

Appendices

9.Return probe to flow chamber and resume nitrogen sparging.

10.When analyzer indicates that DO level is below 20 ppb, change gas to 250 ppm O2 in nitrogen. Run until equilibrated (4-6 hours). After equalization, note barometric pressure and temperature.

11.Compare reading with calculated value.

To Calculate True Value

*Air Sat. Value at T °C x known gas O2 Value	x Barometric Pressure = True Value
20.9%	760 mmHg

Example Calculation

At 25°C using 250 ppm O2 in N2 at 770 mm Hg

True Value = 8.24 x 10-6x 250 x 10-6 x 770 = 9.986 x 10-9or 10 ppb

20.9 x 10-2 760

*If the temperature of the process water is not at 25°C, use O2 Solubility Tables in Table 15-2 and the process water temperature to determine the Air Saturated O2 value.

Special Requirements:

Note 1:Gas Mixture is Oxygen in Nitrogen- use GravametricGases analyzed to +/- 1% of contained gas. Get Certificates of Conformance and Analysis on the purchased gas.

Note 2:Dual Stage, Ultra high purity, high flow pressure regulator- non-corrosive surface. Try to get this from the gas supplier to beconsistent with their recommended setup. Example supplier- Scott Model-18 Series.

Note 3:Glass Gas Washing bottles with fritted disc and beaker. Gas bottle should be filled 3/4 with water. Example supplier- Fisher, Cole Palmer

Note 4:Piping around glass wash bottle should be heavy wall flexiblelasticp. Piping that goes into beaker should be submerged about 1/2” into beakerof water.

Note 5:All other piping should be rigid polypropylene tubing.

Note 6:All calculations are based on 25 Deg C.	Dissolved
	Oxygen Probe
	Model DL5PPB
	Rigid Piping
	Note 5

Honeywell Model 2182 Universal Dual Analyzer

Flow Through

Note 1

Regulator Note 2

	Valve
Oxygen	Note 4
in	Flexible
Nitrogen	Piping

Wash Bottle

Note 3

Chamber #31063336 or

#31063337

Beaker for Venting

Note 4 1/ 2”

Figure 15-7 Suggested ppb Dissolved Oxygen Test Set-up

228 UDA2182 Universal Dual Analyzer Product Manual January 2009