Hach-Lange SI794 D tr User Manual - Manual (Page 10)

Information on how to prevent electrostatic discharges (ESD)
The sensitive electronic components in the device can be damaged
by static electricity. This can impair device performance and even
lead to a complete failure of the device.
Before connecting a sensor, for example, you should discharge any
static electricity buildup from your body. To do so, you can touch an
earth-grounded metal surface such as the chassis of a device or a
metal conduit or pipe.
Important Note
10