Alarm Connection - Hach POLYMETRON 8811 Manuel D'utilisation De Base

The electronic unit (Refer to
connections. Unscrew the four screws holding the unit rear panel and gently swing open from left to
right.
1. Open the electronic unit from the rear panel (2 screws on the left side).
2. Rotate the bottom of the unit.
3. Put the cable into the cable glands.

Alarm connection

Relays R1 and R7 allocated to the thresholds and warning, and are normally open (NO). R8 is
connected to the system alarm and can be normally open (NO: 16-17) or normally closed (NC:
16-18).
Analog output connection
The current outputs 0-20 mA or 4-20 mA are galvanically insulated.
Logic inputs
There are 8 logic inputs (J1 to J8, all galvanically insulated). Each logic input has four pins with the
following characteristics:
Pin number
Logic input Allocated to
number
J1 Level sample detection (in
8810 reactor vessel)
J2 to J7 Inhibition of channel 1 to
6
J8 Remotely acknowledge
system alarm
Contact J1 is used for the sample detection. Please make sure at this point of the installation that
the contact J1 is configured as stated in the table below:
J1 configuration
Discontinuous
Serial interface connection
The 8811 has two serial interfaces:
• The first one for the communication with a logging device (computer, printer, etc.)
• The second is dedicated to the communication with the analyzer
Connexion between the sequencer and a logging device: RS232/1
12 English
Figure 1 on page 8) must be opened from the rear to make these
Characteristics
Ground
Input signal
Photodiode current supply
5V supply
Strap pins 3 and 4
Note: Only if the analyzer is an 8810
Otherwise, display shows NO SAMPLE alarm.
Inhibit channel analysis.
A new cycle with the next channel in the programmed sequence
starts immediately (IMPORTANT: This functionality is not available
if coupled with an 8810-ISE analyzer).
Acknowledge the system alarm.
A new cycle with the next channel in the programmed sequence
starts immediately (IMPORTANT: This functionality is not available
if coupled with an 8810-ISE analyzer).
No strap Strap between 3 and 4
*