Honeywell UDA2182 manual Rinse and One-Point Calibration

Index

divert the discharge to drain.

3Relay 2 activates solenoid valve S2 for the preset buffer time (1 to 1999 seconds) to direct buffer solution past the electrodes by gravity.

4After a stable reading is reached or the set maximum buffer time elapses, the 9782 stores the new calibration value using automatic buffer recognition. Diagnostics detect excessive instability or offset, prevent erroneous calibrating and can activate an alarm, depending on configuration. If the diagnostic fails, an error message is always displayed on the alarm stripe (see Section 12).

If an unacceptable value is obtained, it will be rejected and the previous value will be retained for uninterrupted operation.

5All valves are deactivated to resume measurement of the sample.

6A delay period (1 to 1999 seconds) can be configured to permit the measurement to stabilize on the process sample. At the end of the delay period normal alarm, control and output operation resumes. The “HOLD” and “AUTOSEQUENCE” messages are cleared.

	Items outside this area
buffer	provided by user
solution
9782
	to process
pH	S4
electrode
S2	to drain
process	rinse water
sample
S1

Figure 15-12 Rinse and One-Point Calibration

Rinse and two-point calibration sequence

With this function, rinse and one-point standardization operations are performed as described previously according to the configured schedule. If two-point calibration is to be performed periodically, then after the configured number of standardization operations, Steps 4a and 4b shown below are also performed (before Step 5 above) to make the slope adjustment.

4a Relay 3 activates solenoid valve S3 for the configured buffer time to direct the second buffer flow to the electrodes.

4b After stability is reached or the set maximum buffer time elapses, the instrument calculates and stores a new slope value using automatic buffer recognition. Diagnostics detect excessive instability or offset, prevent erroneous calibrating and can activate an alarm, depending on configuration. If the diagnostic fails, an error message is always displayed on the alarm stripe (see Section 9).

If an unacceptable value is obtained, it will be rejected and the previous value will be retained for uninterrupted operation.

236 UDA2182 Universal Dual Analyzer Product Manual January 2009