Index revision : A
8
7021
WARNING : The use of very high voltage increases the risk of sparks. SAMES Technologies
atomizers and high-voltage electrostatic generators are designed to minimize this risk. Although
the HV electrode is the only accessible part, a safety distance of X mm (refer to: Board) has to be
maintained between the parts of the sprayer that are under high voltage and all the parts that are
grounded.
TRP 501/502 with plastic nozzle and cap and UHT 156 EEx e
Authorised spraying distance
TRP 501/502 with metallic nozzle and cap and UHT 156 EEx e
Authorised spraying distance
In addition, a careful check must be made to ensure that any conducting or semi-conducting part closer
than 2.5 m to the atomizer is correctly grounded.
If it is not, electrical charges capable of causing sparks could build up on it. Operating personnel must
wear anti-static shoes and gloves to avoid this risk.
All metal parts of the booth and parts to be painted must be correctly grounded. Ground resistance must
be less than or equal to 1 M
Ω
(minimum measurement voltage 500 V). This must be checked regularly.
Grounding is mandatory for all the conductive envelops of the electrical equipments and for all the con-
ductive components within explosive atmospheres by conductive connection with the ground terminal.
Finally, for the same reasons, the spraying area must have an anti-static floor, such as concrete, metal
duckboard, etc.
It is essential to provide sufficient ventilation in the spraying booths to avoid the build up of inflammable
vapors.
Voltage
(kV)
Distance
(mm)
0
100
50
60
70
80
90
100
Voltage
(kV)
Distance
(mm)
0
100
50
60
70
130
80
160
90
180
100
200
0
50
100
150
0
50
60
70
80
90
DES03584
Distance (mm)
Tension (kV)
”X” safety distance depending on the
voltage
Unauthorised spraying zone
0
50
100
150
200
80
90
70
60
50
0
DES03585
Distance (mm)
Tension (kV)
”X” safety distance depending on the
voltage
Unauthorised spraying zone
