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CLEANING MODE
15. CLEANING MODE
Data acquisition is done by digital probes via specific sensors. Due to process conditions, sensors can
get clogged. To maintain accurate and reliable data, the
HI510
has implemented the cleaning control
function as a basic feature.
When in cleaning mode, the controller activates an external device (e.g. a pumps or valves).
Cleaning control block provides a specific sequence on cleaning outputs based on two control
algorithms: Simple cleaning and Advanced cleaning.
Cleaning Control
&
Sequencer Block
Cleaning enabled
Sample rate
Calendar
Timer
External digital input
Cleaning output
Controller status
Figure 44:
Cleaning Control & Sequencer Block
15.1. CLEANING BLOCK INPUTS & OUTPUTS
Cleaning block inputs and outputs are common to both Simple and Advance cleaning.
The common, to both types of cleaning, inputs are:
• Calendar, cleaning triggered at specific time and week day. Internal RTC will be used as reference.
• Timer, cleaning triggered at a fix interval. The one second time base interval will be used for that.
• External digital inputs, cleaning triggered at transition from inactive to active state on one or more
digital inputs, provided the inputs are assigned to do this.
• Controller Status, cleaning can be stopped, suspended or resumed upon controller reaching certain
status.
• Cleaning Enabled, main condition that allows (or not) cleaning to run.
• Sample Rate, timing has the one second time base interval used for all time-sequences evaluation.
Outputs are assigned as:
• Rinse for both Simple and Advanced cleaning where one or more relays are assigned to cleaning,
rinse phase.
• Wash, for Advanced cleaning where one or more relays are assigned to cleaning, wash phase.
