Honeywell UDA2182 manual Calibrating the Integral Pressure Sensor Introduction, Pressure Cal

Input Calibration

Calibrating the Integral Pressure Sensor

Introduction

The concentration of oxygen dissolved in air-saturated water depends on the barometric pressure. This dependence is automatically compensated for during air calibration using a pressure sensor built into the Analyzer. The purpose of the pressure calibration is to calibrate that pressure sensor. However, this sensor has been factory calibrated and should not require re-calibration.

Procedure

Determine the true ambient barometric pressure, such as from a calibrated pressure transmitter or a mercury barometer. Absolute barometric pressure is required - not the “relative” sea-level pressure normally reported by the weather bureau.

Table 8-13 Calibrating the Integral Pressure Sensor

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

		Use	to select
		Input 1 or 2 DO Cal
3
	Enter	IN1 DO CAL
Press		Air Cal
		Sample Cal
		Reset Cal Factor
		Pressure Cal
		Pressure Offset
		Reset Prs Offset
		Bias Scan
		Bias Volts
		Reset Bias Volts

Use to select

Pressure Cal

January 2009 UDA2182 Universal Dual Analyzer Product Manual 171