Honeywell UDA2182 manual Buffering Method of Calibrating pH Electrodes, Buffer 2 stability check

			Input Calibration
Step	Action		Screen
12	Once the reading is stable	“Buffer 2 stability check”
	Press Enter	Use	to change the value of
		the Buffer.
		“Up/Down changes Buffer”
13	If the calibration fails, an error	Error Messages:
	message will be displayed	Buffer span too low
	across the bottom stripe of the
	screen.	OFFSET UNDERRANGE
	Make necessary adjustments	OFFSET OVERRANGE
	and re-calibrate.	Slope underrange
		Slope overrange
		Solution Unstable
		Temp Too Low
		Temp too High
		See Table 12-2 for definitions

8.5.3Buffering Method of Calibrating pH Electrodes

Recommended for most applications

This technique is recommended for best accuracy in most applications.

Materials

Materials required are:

•Two standard buffer reference solutions that are at least 2 pH apart from one another.

•A container for each, large enough to immerse the electrode to measuring depth.

•Distilled or de-ionized water to rinse the electrode.

Procedure

Make sure you have selected “PV Type –pH Glass, pH Durafet, or pH HPW ” in the Inputs configuration - Table 6-5.

Refer to Section 6.4.1 – General Rules for Editing.

January 2009 UDA2182 Universal Dual Analyzer Product Manual 145