Electrostatic Charge; Esd Protective Measures; About The Physics Of Electrostatic Charges; Dentsply Sirona - DENTSPLY inLab MC X5 Operating Instructions Manual

3 Safety information
3.3 Electrostatic charge
ESD

ESD protective measures

Training
What is an electrostatic charge?
Formation of an electrostatic charge
Amount of charge
24
3.3

Electrostatic charge

3.3.1 ESD protective measures
ESD stands for ElectroStatic Discharge.
ESD protective measures include:
● Procedures for preventing electrostatic charge build-up (e.g. air
conditioning, air moistening, conductive floor coverings and non-
synthetic clothing)
● Discharging the electrostatic charges of your own body on the frame
of the UNIT, the protective ground wire or large metallic objects
● Connecting yourself to ground using a wrist band.
We therefore recommend that all persons working with this system be
instructed on the significance of this warning label. Furthermore, they also
should receive training in the physics of electrostatic discharges which
can occur in the practice and the destruction of electronic components
which may result if such components are touched by electrostatically
charged USERS.
The content of this training is explained in the Chapter "About the physics
of electrostatic charges" [ → 24].
3.3.2

About the physics of electrostatic charges

An electrostatic charge is a voltage field on and in an object (e.g. a human
body) which is protected against conductance to ground potential by a
nonconductive layer (e.g. a shoe sole).
Electrostatic charges generally build up whenever two bodies are rubbed
against each other, e.g. when walking (shoe soles against the floor) or
driving a vehicle (tires against the street pavement).
The amount of charge depends on several factors:
Thus the charge is higher in an environment with low air humidity than in
one with high air humidity; it is also higher with synthetic materials than
with natural materials (clothing, floor coverings).
Electrostatic discharge must be preceded by electrostatic charging.
The following rule of thumb can be applied to assess the transient
voltages resulting from an electrostatic discharge.
An electrostatic discharge is:
● perceptible at 3,000 V or higher
● audible at 5,000 V or higher (cracking, crackling)
● visible at 10,000 V or higher (arc-over)
The transient currents resulting from these discharges have a magnitude
of 10 amperes. They are not hazardous for humans because they last for
only several nanoseconds.

Dentsply Sirona

Operating Instructions inLab MC X5
64 78 759 D3608
D3608.201.01.07.02 10.2017