Honeywell UDA2182 manual PH Calibration, Using the restart screen

Input Calibration

8.5 pH Calibration

8.5.1Introduction

pH instrument calibration consists of standardization and slope adjustments. Standardization is a pH Offset adjustment to compensate for electrode drift. Slope adjustment is a span adjustment to match the gain of the instrument to the electrode output response. For Durafet III pH electrodes, initial factory default value of offset and slope are automatically uploaded by the UDA. These values will appear in the “pH/ORP Cal” screens Table 8-2, step 4.

The analyzer supports two methods of calibration:

•With the “Buffering” method described in this section, you use your electrode system to measure two reference solutions (“buffers”) having known pH values, and then adjust the analyzer so that its readings match the actual pH of each.

ATTENTION

The two reference solutions must have a pH difference of at least 2.

•With the “Sample” method described in this section you measure your process, both with your electrode system and with a separate (accurately calibrated) meter, then adjust the analyzer so that its reading matches the meter.

ATTENTION

When a Durafet III pH electrode is replaced, its electrode calibration data needs to be updated by the UDA2182 Analyzer. This is done either by power cycling the analyzer or using the restart screen.

Using the restart screen

Press				Action
Display	Repeatedly until the One Input or Two Inputs display
	screen appears.
Enter	You will see:
		Was probe replaced?
				No
	to change to
			Yes
Enter	to restart the UDA.

140 UDA2182 Universal Dual Analyzer Product Manual January 2009