Hach-Lange WPC-22 - Manual (Page 11)

c. Connect the incoming and outgoing cable wires to the
J4 connector. Refer to Table 5 .
3. Do step 2 again for the third and remaining units until all the units
have incoming and outgoing connections. The last unit will not have
an outgoing cable.
Note: In a network installation, the outgoing cable from the previous unit is
always the incoming cable on the next unit.
4. On the last unit, install a jumper across JP2. Do not install a jumper
across JP2 on the other units.
5. Set the MODE option to N (network mode). Refer to the Date/MODE
option in Configure the particle counter on page 13.
6. Assign a unique address to each unit. Refer to the Unit ID option in
Configure the particle counter on page 13.
Table 5 RS485 connections
Wire J4 pin
– RS485A
+ RS485B
Shield SGND
Plumbing
Plumb the instrument
Items to collect:
• 6 mm OD opaque tubing
• Two, 6 mm ferrules
Select tubing based on the worst case environmental conditions (e.g.,
temperature range, exposure to sunlight, contaminants in the air) and
the highest possible inlet pressure (maximum of 120 psi).
1. Remove the tubing from the sample line fitting and drain line fitting
and discard. Do not reuse the tubing for the sample line or drain line.
2. Connect a sample line to the sample line fitting on the body of the
instrument. Refer to Figure 6 .
3. Connect a drain line to the drain line fitting on the body of the
instrument. Refer to Figure 6 .
4. Install a Y-strainer in the sample line as necessary to prevent large
particles from entering the sensor which will result in a blockage.
5. Install a manual isolation valve in the sample line so that the flow to
the instrument can be stopped as necessary.
Figure 6 Plumb the instrument
1 Sample line fitting 3 Plastic nut
2 Drain line fitting 4 Ferrule, 6 mm
Sample line guidelines
Select a good, representative sampling point for the best instrument
performance. The sample must be representative of the entire system.
To prevent erratic readings:
• Collect samples from locations that are sufficiently distant from points
of chemical additions to the process stream.
• Make sure that the samples are sufficiently mixed.
• Make sure that all chemical reactions are complete.
English 11