DESCO EUROPE
- 2A DUNHAMS LANE, LETCHWORTH, HERTFORDSHIRE, SG6 1BE, UK
Phone: +44 (0) 1462 672005 • E-mail:
TB-3076.E
Page 4 of 5
© 2019 DESCO INDUSTRIES INC
Employee Owned
Do not attempt to perform any repairs or adjustments on
your Desco Europe equipment except for those covered
in the operation manual. Self-made repairs could create
a hazard and will void the warranty.
Replacing the Air Nozzle Assembly
The air nozzle and hose assembly is designed to be
removed or replaced by the user in the event of damage
or wear. To replace the assembly, simply unscrew the
collar at the base of the hose and gently disconnect the
connector from the receptacle.
Neutralisation Efficiency (Decay Time)
The comparative neutralisation efficiency of ionisers
is determined by a standard test published by
IEC 61340-4-7. The decay rates measured using
this standard are shown in the chart below. This
performance was measured with the air nozzle at a
distance of 6" (15 cm) from the charged plate and
utilising an air pressure of 30 psi.
Decay Rate per IEC 61340-4-7
Test
Pressure
Decay
Rate
30
psi
2
seconds
Charge Decay Time Constants
1. Decay times are from ±1,000 volts to ±100 volts.
2. The air nozzle’s air stream is perpendicular to the
charged plate.
Depress
to release
Figure 7. Replacing the air filter
ION
PYTHON
CONTROLLER
Figure 6. Replacing the hand gun attachment
To replace the nozzle assembly simply repeat the
process in reverse.
NOTE: Make sure the fittings inside the connector are
properly aligned with their receptacles before tightening
the threaded collar.
Replacing the Air Filter of the Ion Python
Periodic replacement of the air filter is recommended
for optimum performance of the ioniser. Compress
outer sleeving away from the filter housing. Examine
the filter for any evidence of contamination. The filter
will turn red if there is any oil contamina tion. If there
has been moisture build-up, there will be a change in
air volume or a brownish colour to the filter. If either of
these conditions exist, you should replace the filter by
unsnapping connectors. Depress air line connectors
allowing removal of filter. The filter replacement is sold
. Be sure to observe the
flow direction on filter when installing a replacement.
Nozzle
Charged Plate
Figure 8. IEC 61340-4-7 decay time test setup
Calibration
Test using a version of IEC 61340-4-7. Observe and
record offset voltage (float voltage) in voltage, measure
of discharge time for +1000 volts to +100 volts and
-1000 volts to -100 volts in seconds.
Equipment and tools used
• Charged Plate Monitor (CPM)
• Medium sizes insulative flat head screw driver
Set-up
1. Refer to IEC 61340-4-7. Test should be performed
on static dissipative worksurface. Testing technician
and worksurface needs to be properly grounded.
2. Refer to figure 8 - Test location for compressed gas
- Guns or nozzles on page 13. CPM needs to be 6”
from the center of the CPM plate to worksurface.
Tip of air nozzle needs to be at 6" (15 cm) away
from surface of CPM plate.
