Hach RTC Standardized Combined Manuel D'installation page 12

Figure 6 Connect to a power supply
5.3.3 ICP477 power supply
Potential Instrument Damage. Delicate internal electronic components can be damaged by static electricity,
resulting in degraded performance or eventual failure.
Connect the device only to a 24 VDC power supply that agrees the requirements of safety extra low
voltage (SELV) according to IEC/EN/DIN EN/UL 60950-1. Refer to
earth. Refer to Figure 8
Figure 7 Connect to protective earth
12 English
N O T I C E
to connect to a power supply.
Figure 7 to connect protective