Hach 900 MAX manual Appendix B, Distributor Test, Event List, Logged events include, Keypad Test

Appendix B

Distributor Test

The distributor positions the sample tube over the appropriate bottle during multiple bottle sampling. If the distributor arm is obstructed or if a problem exists with the distributor assembly, the arm will not position over the desired bottle correctly.

This test assumes that 24 bottles are installed which is the most difficult to position for the distributor (the most stops and the smallest bottle mouth). Upon selecting the Distributor Test, the arm returns to the bottle #1 position then moves one bottle at a time for all 24 bottle positions. The arm then reverses direction and again stops at all 24 positions on its way back to the bottle #1 position. Make sure no obstructions interfere with the distributor arm rotation.

Event List

The Event List diagnostic provides a time/date stamped list of significant events occurring in the sampler. You can review these events to find out when an event occurred and what events preceded or followed the event of interest. Events may be viewed in chronological order from the beginning or end of the event list by selecting View From Start or View From End.

The event list cannot be erase, even when the program is started. Up to 200 events are logged before the list wraps around and the oldest entry is discarded as each new entry is posted.

Logged events include:
•	Power On/Off	•	Alarm Activation/De-activation
•	Level Adjustments	•	Calibration
•	Program started, stopped,	• Missed Samples (if liquid sensor
	halted, or resumed		is enabled)

•Error Messages

Keypad Test

Keypad Test provides a simple means of verifying the operation of all front panel keys. Select Keypad Test from the diagnostics menu to bring up the following screen:

11:00 AM 21 - APR - 01

KEYPAD TEST

QUIT

KEYPAD PRESSED:

5

PRESS ANY KEY

Pressing any key on the front panel (except for the upper left soft key) will cause that key label to appear in the center of the display.

All numeric keypad keys, soft keys, and function keys may be tested in this manner. To end, press QUIT (this also verifies the upper left soft key operation).

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Programming Features 8990apdx_pfeatures.fm