DynaJet® IC7140
www.teejet.com
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APPENDIX A –
DYNAJET APPLICATION CHARTS
DYNAJET IC7140 NOZZLE SELECTION
Selection of the proper spray nozzle for use with the DynaJet IC7140 system is much like selecting the spray nozzle for a traditional spraying operation.
Along with the extra application flexibility, DynaJet IC7140 brings a few other nozzle-related considerations that will be summarised below.
1.
Duty Cycle
a.
DynaJet IC7140 controls nozzle flow rate by varying the portion of time that each nozzle is ‘on’ vs. ‘off’. The on time is referred to as duty
cycle. The range of duty cycle available is typically 30% to 100%, meaning that the nozzles on the machine will have the approximately 30%
to 100% of their rated flow capacity.
b.
With the DynaJet IC7140 system:
spray nozzle flow capacity = spray nozzle size x duty cycle
c.
By varying the duty cycle, the DynaJet IC7140 is essentially varying spray nozzle capacity on the fly. When more pressure is required, the
nozzle capacity (duty cycle) is reduced. When higher nozzle capacity is required, the duty cycle is increased.
d.
Although the operator has a much more flexible and forgiving application system with DynaJet IC7140, care should be taken to select spray
nozzles that give the best possible results.
e.
When selecting a spray nozzle, review the DynaJet IC7140 nozzle selection charts and select a spray nozzle capacity that produces the target
application rate at a duty cycle of about 70% when running at expected travel speeds. In other words, choose nozzle capacity and desired
pressure/droplet size closer to the high end of the speed (or rate) range than to the lower end. This will provide plenty of adjustment range for
DynaJet IC7140 to reduce duty cycle when travel speed slows, while also providing additional capacity if travel speed increases above the
planned speed.
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The default setting for minimum duty cycle is 30%. This means the system will not adjust the duty cycle below 30% ‘on’. While this
setting can be set as low as 20% by the operator, the higher default value provides a more uniform application at lower speeds.
2.
Spray Nozzle Selection
a.
The DynaJet IC7140 system is not compatible with all spray nozzles. Approved nozzle series include: AI Turbo TwinJet, Turbo TeeJet Induction
TwinJet, Turbo TeeJet, Turbo TeeJet Induction, Turbo TwinJet, TwinJet 110, TX ConeJet, TXA ConeJet, TXR ConeJet, XR TeeJet 110 and
XRC TeeJet 110.
NOTE: Listed series may not include all available capacities. Changes to series and/or capacities may occur with software updates.
b.
Different nozzle styles have different droplet size characteristics across the range of operating pressures. The spray nozzle style should be
selected based on the desired droplet size at the pressures expected to be in use for your application.
c.
Always use spray nozzles with 110° (or wider) spray pattern. These spray nozzle part numbers will typically include the 110 in their name – for
example TT11006VP or XR11006-VS. 80° spray nozzles are not recommended with DynaJet IC7140.
3.
Spray Height
a.
In order to achieve the best possible spray coverage, make sure to keep spray height at or above 50 centimeters / 20 inches from the nozzle
to the target.
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