Hach POLYMETRON 8811 Manuel D'utilisation De Base page 20

SEQUENCE menu
DISPLAY
PROGRAMMING
SEQUENCE
Press ENTER.
SEQUENCE
XXXXXXXXXXXXXXXX
Press ENTER.
TIMING menu
DISPLAY
PROGRAMMING
TIMING
Press ENTER.
Programming procedure is always the same:
• XX and YY are adjusted with the SCROLL UP/DOWN keys (from 0 to 99)
• Adjust the YY block first (and press ENTER)
• Then adjust the XX block (and press ENTER)
• The display automatically shows the next step in programming
Discontinuous analyzer
With this combination, the 8811 receives an instruction (to open the next channel of the programmed
sequence) by the analyzer itself at the exact same time than the analyzer open its sample valve.
The cycle time corresponds to the period for the analyzer to send its instruction. It can be seen also
as the time between two valves opening.
TIMING
Cycle t. XX YY
For programming procedure, see above
The "Cycle Time" enables to operate the analyzer on a regular time basis even if the duration of the
titration vary with the concentration of the sample. An extendable waiting time (called "Fix-time") is
automatically calculated to compensate the variation of the titration time (called "Measure"). Sum
"Measure" and "Fix-time" equals "Cycle time".
Analog outputs and alarms are refreshed just after the end of "Measure"
Program "Cycle Time" to "00 00" and (8810 / SEQUENCE = LOOP) to operate the analyzer with
immediate succession of batch analysis (no waiting time).
TIMING
Limit t. XX YY
For programming procedure, see above
If "Measure" time exceeds this programmi8ng, a system alarm (ER 31) is generated:
• "Over tit. Time" message sent on display and 1st RS232
• System Alarm relay switches from position NO to closed (or vice-versa)
20 English
DESCRIPTION
Choice of the sequence (16 max.)
X represents any figure from 1 to 6. Full pattern up to 16 steps.
DESCRIPTION
Adjust the different timings of each analysis cycle
One measurement every XX minutes and YY seconds
Maximum time limit for the "Measure"