Honeywell manual January UDA2182 Universal Dual Analyzer Product Manual 169

Input Calibration

Calibrating a Dissolved Oxygen Probe Using Sample Calibration Method

Introduction

Sample calibration allows a calibration based on a known dissolved oxygen concentration. It is similar to air calibration except that the known DO value may be entered. Assuming an accurate reference is available, use the sample calibration method rather than air calibration if any of the following conditions apply:

•The air is below freezing (32°F, 0°C), or hot (above 104°F, 40°C) or very dry (below 20% relative humidity).

•The probe is mounted such that it is much easier to measure the concentration of the DO in the water independently than to expose the probe to air. Such mounting is not recommended but is sometimes necessary.

•The measurement interruption for air calibration cannot be tolerated.

Sample calibration is usually executed by leaving the probe in the measured sample and adjusting the analyzer to agree with the sample dissolved oxygen measured with a properly calibrated portable dissolved oxygen meter whose probe is held very close to the probe of the analyzer. Alternatively, the probe may be removed from the measured sample and placed in a sample of known dissolved oxygen concentration.

Procedure

Table 8-12 Calibrating a Dissolved Oxygen Probe Using Sample Calibration

Method

Step Action Screen

1Power the probe for at least one hour. (power the probe for 24 hours if initial installation)

2	Calibrate	CALIBRATION
Press		Input PV Cal
		Input Temp Cal
		Output Cal
		Cal History
3
	Enter	PV INPUT CAL
Press
		In 1 DO Cal

Use to select

Input 1 or 2 DO Cal

January 2009 UDA2182 Universal Dual Analyzer Product Manual 169