Hach 2200 PCX Manuel D'utilisation page 19

Menu number Command line message
5 ENTER LOWER SIZE
ENTER UPPER SIZE (0 FOR
CUMULATIVE)
6 ENTER FLOW RATE
7 CALIBRATING DISPLAY
8 DEFAULT MEMORY
9 SETUP ANALOG I/O
Configure the analog output connection
It is possible to configure a maximum of eight analog output signals of particle count data for the
instrument with an analog I/O card installed. The analog output connections are identified as
OUT0 through OUT7. Ground connections for all analog outputs are made to I-RET. All of these
outputs are configured as 4–20 mA outputs. Refer to
1. Determine the correct count period.
The manufacturer recommends to set a count period between 6 and 15 seconds for raw water or
filter influent samples and 24 to 60 seconds for clean filtered water.
2. Set the count period in the main menu. Refer to
Note: If the digital RS485 signal is connected to the data collection software, the count period is set in the
software. The connection to WQS Vista data collection software automatically overrides the count period set in
the main menu during the configuration programming.
3. Configure the output channels (1 to 8).
A shielded, twisted-pair cable, wiring for eight channels and the connections to a PLC or other
devices are necessary for each channel.
4. Configure the analog outputs for cumulative or differential count formats in all possible
combinations. Configure one output for cumulative and another for differential if necessary.
5. Set the lower and upper size for one channel. Refer to
on page 17.
6. Determine the correct setting for the full scale value. Refer to
on page 19.
Determine the full scale value
Counts/mL must be less than or equal to 17,000 counts/mL (the concentration limit of the
instrument). The value used for counts/mL should be as small as is applicable for the sample to be
measured. Select the maximum counts/mL with the applicable resolution of the analog output signal.
Refer to Table 3 for the sample size references.
The full scale value is calculated as follows: Full Scale (FS) = counts/mL x mL sample; mL sample =
3
100 mL/min x count period (in minutes) or = 100 mL/60 seconds x count period (in seconds)
3
The necessary flow rate for this instrument is 100 mL/min ± 5%.
Table 2 Operating parameter selection (continued)
Description
Specify the particle size range (for front panel numerical
display units only). Do not set a lower size to less than
2 microns.
Specify the largest particle to be included in the count shown
on the display (for front panel numerical display units only).
If 0 is entered, the display shows particles/count period (raw
count).
If 100 mL/min is entered, the display shows particles/mL
(normalized count).
Use for the 4-20 mA analog output calibration. Toggles from
4-20 mA when the space bar is pushed on the connected
computer.
Do not enter a message on this line unless instructed by the
manufacturer.
Use only when an analog I/O card is installed.
Figure 9 on page 16.
Configure the RS485 connection
Configure the RS485 connection
Determine the full scale value
on page 17.
English 19