Hanna Instruments HI520 - Cleaning Triggers

Cleaning Mode 104
19.5. CLEANING TRIGGERS
External input
The external digital inputs are set to start cleaning process. Transition of external digital inputs from an inactive
to active level will start the cleaning.
Cleaning triggered by external Input
External Input
Cleaning
Cleaning
cycle
Cleaning
cycle
Cleaning
cycle
Time
Time
Figure 50: Cleaning Trigger, External Input
Internal timer
Cleaning starts at fix intervals, prompted by an internal timer.
Cleaning triggered by internal Timer
Internal Timer
Cleaning
Cleaning
cycle
Cleaning
cycle
Cleaning
cycle
Cleaning Interval
Time
Time
Figure 51: Cleaning Trigger, Internal Timer
Internal schedule
Cleaning starts at exact times, with a maximum of three start times per day.
Time
Time
Time
Scheduled week
day
Scheduled time
Cleaning
Cleaning triggered by schedule (calendar)
Monday Tuesday Wednesday Thursday Friday Saturday Sunday
Start
time1
Start
time2
Start
time3
Start
time1
Start
time2
Start
time3
Cleaning
cycle
Cleaning
cycle
Cleaning
cycle
Figure 52: Cleaning Trigger, Internal Schedule
Operator intervention
Cleaning starts by pressing the left virtual key on keypad when in Menu, Cleaning menu item selected. Cleaning
should have been enabled previously.
Cleaning triggered by internal Timer & external input
External input
Internal Timer
Cleaning
Cleaning interval
Cleaning
cycle
Cleaning
cycle
Cleaning
cycle
Time
Time
Time
Figure 53: Cleaning Trigger, Operator Intervention