Honeywell UDA2182 manual Ph/Orp/Do, Probe Calibration Diagnostics

Diagnostics and Messages

12.3 Calibration Diagnostics

pH/ORP/DO

All of the possible errors are detected during a probe calibration and will abort the calibration process with the message “FAIL” appearing briefly, followed by a return to the online pH/ORP/DO display. At that point, the specific error will be displayed as described. In addition, any of following errors may occur during probe calibration and abort the calibration process.

Table 12-2 Probe Calibration Diagnostics

Status Message	Definition
BUFFER SPAN TOO LOW	The span between pH buffer 1 and pH buffer 2 is less than 2 pH. Use a set of
	buffers that are at least 2 pH apart. As a warning status, will clear when an
	appropriate buffer 2 value is selected. As an error message, will abort
	calibration and preserve original slope value.
OFFSET UNDERRANGE	Resulting pH offset (standardization) value is less than –2 pH after pH slope
	calibration. Calibration is aborted and original pH offset and slope values are
	preserved.
OFFSET OVERRANGE	Resulting pH offset (standardization) value is greater than 2 pH after pH slope
	calibration. Calibration is aborted and original pH offset and slope values are
	preserved.
SLOPE UNDERRANGE	Resulting pH slope is less than 80%. Calibration is aborted and original slope
	value is preserved.
SLOPE OVERRANGE	Resulting pH slope is greater than 105%. Calibration is aborted and original
	slope value is preserved.
CAL FACTOR UNDERRANGE	Resulting DO calibration factor is less than 0.001268. DO calibration is
	aborted and original calibration factor is preserved.
CAL FACTOR OVERRANGE	Resulting DO calibration factor is greater than 0.040580. DO calibration is
	aborted and original calibration factor is preserved.
PROBE CURRENT TOO LOW	DO probe current is less than 5 µA. DO bias scan is aborted and original bias
	voltage is preserved.
PROBE CURRENT TOO HIGH	DO probe current exceeds the greater of 133% of the probe current at last
	successful calibration or 160 µA. During DO bias scan, scan is aborted and
	original bias voltage is preserved.
READINGS UNSTABLE	DO air PV or temperature readings too unstable for successful air calibration.
	Calibration is aborted and original calibration factor is preserved.
SOLUTION UNSTABLE	pH solution PV or temperature readings too unstable for successful auto
	buffer calibration. Calibration is aborted and original pH offset (for buffer 1) or
	slope value (for buffer 2) is preserved.
SOLUTION TEMP TOO LOW	pH solution temperature readings less than minimum of 0 degrees C. Auto
	buffer calibration is aborted and original pH offset (for buffer 1) or slope value
	(for buffer 2) is preserved
SOLUTION TEMP TOO HIGH	pH solution temperature readings greater than maximum of 100 degrees C.
	Auto buffer calibration is aborted and original pH offset (for buffer 1) or slope
	value (for buffer 2) is preserved

January 2009 UDA2182 Universal Dual Analyzer Product Manual 193