Hach 900 manual Operation, Keypad and Key Functions, Section

Section 4	Operation
4.1 Keypad and Key Functions
	Figure 8 shows the 18-position keypad and 24-character alphanumeric
	display.
Button	Function
ON	Energizes Sampler
OFF	De-energizes sampler and halts program in progress
	Initiates the sampling program and resets all counts to zero (including datalogger).
START PROGRAM	When the START PROGRAM button is pressed, all recorded data (program entries and
	collected sample times/dates) are erased from memory. Always download recorded data
	before pressing START PROGRAM.
NEW PROGRAM	Allows input of new sample program...programming choices appear on display.
YES/ENTER	Causes a positive response when a question appears on display; accepts new programmed
	value or previously entered value.
NO/PASS	Causes a negative response when a question appears on display; in standby state, the
	software revision number is displayed.
CLEAR ENTRY	Erases program value shown on display; when held for two seconds, permits enable/disable
	of level actuation/auxiliary control.
DISPLAY FEEDBACK	Displays program status and a review of the program.
CHANGE/HALT	Stops sampler program and places in standby state. When started, press this key prior to
	making any program change and before pressing keys 4, 5, 6, 7, 8, 9, and NEW PROGRAM.
RESUME PROGRAM	Causes the program to continue from the point at which it is halted.
BOTTLE ADVANCE	Feature not available with this model.
PUMP (Manual Mode)	Pumps sample liquid (pump forward) when held. Pump stops when released.
PURGE (Manual Mode)	Purges sample liquid (pump reverse) when held. Pump stops when released.
STOP PUMP (Manual Mode)	Stops pump when using PUMP LOCK (see *). When held for 3 seconds (with sampler in a
	standby state), permits selection of other languages.
TAKE SAMPLE	Initiates sample cycle independent of program.
TIME SET	Allows setting real time and date
TIME READ	Causes real time and date to appear on display. When held for 3 seconds, display indicated
	time and date each sample was taken (or missed).
	During programming, causes program to back-step. After CHANGE/HALT, allows altering of
	bottle parameters (container volume, etc.). After CHANGE/HALT, provides review of
* (asterisk)	parameters (i.e. number of bottles, volume of bottle(s), line length, etc.). After PUMP/PURGE,
	(manual mode) activates PUMP LOCK. Pump runs forward (KEY 5) or reverse (KEY 6)
	without holding key. KEY 7 stops the pump.

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8544operations.fm	Operation