Electronic Unit - Hach POLYMETRON 8811 Manuel D'utilisation De Base

Electronic unit

The controller unit is made up of 3 boards which ensure the following functions:
• Power supply board
• Micro-controller board
• Display board
Power supply
This module gives the required supplies to the instrument and auxiliary equipment.
Display/keyboard
This module allows user programming and interrogation:
• 4 keys for programming
• 1 numeric display
• 1 alphanumeric display (display of the programming messages)
Microprocessor
INTEL 80C51 type, associated to memory, peripherals; allows the control of the analyzer function.
Memory
2 types of memory:
• EPROM: program storage memory
• RAM: data memory (battery backup)
Logic inputs
The instrument has 8 logic inputs allowing level detection of samples or channel inhibition.
Accessory controls
The accessories are controlled by transistors 24V DC. 8 relays are available for the limits and
alarms.
Serial communication
The 8811 has 2 serial interfaces (RS232):
• One for the communication with the analyzer
• One for the external communication which can be configured also as an RS485
Installation
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the document.
Mains power should only be connected once installation has been completed and checked.
Chemical or biological hazards. If this instrument is used to monitor a treatment process and/or chemical feed
system for which there are regulatory limits and monitoring requirements related to public health, public safety,
food or beverage manufacture or processing, it is the responsibility of the user of this instrument to know and
abide by any applicable regulation and to have sufficient and appropriate mechanisms in place for compliance
with applicable regulations in the event of malfunction of the instrument.
Unpacking
Carefully remove the analyzer and its accessories from the box and packing material, referring to the
packing list included to confirm that everything has been delivered. Please visually inspect the
analyzer for shipping damage. If anything is missing or damaged, contact the manufacturer or your
dealer immediately.
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D A N G E R
D A N G E R