Hach POLYMETRON 8544 Manuel D'utilisation page 6

Figure 1 Air or water electrode cleaning system
1 Junction box (optional)
2 Controller (optional)
3 Electrovalve connector
6 English
4 Air or water inlet
5 Cleaning module (electrovalve)
6 Brass adapter, air or water outlet
7 Nozzle for 8340/44 probes
8 Nozzle for 8350 probes