Hach SIGMA 900 - Manual (Page 21)

Page 21
8544operations.fm Operation
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
START PROGRAM
Initiates the sampling program and resets all counts to zero (including datalogger).
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).
* (asterisk)
During programming, causes program to back-step. After CHANGE/HALT, allows altering of
bottle parameters (container volume, etc.). After CHANGE/HALT, provides review of
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.