12
Vacuum
Control
Using Vacuum to Make Deposits of Watery-Thin Fluids
The Ultra 870 vacuum control allows low viscosity fluids, even water, to be consistently dispensed
without dripping between cycles. A vacuum is exerted above the fluid in the barrel to prevent
dripping. For medium to high viscosity fluids, the vacuum should be shut off.
If you are dispensing watery solvents, cyanoacrylates or anaerobics, request the blue LV Barrier
TM
piston and follow these steps to fill the syringe barrel and set the vacuum control.
1.
Twist an orange tip cap onto an empty syringe barrel and pour your fluid in. Maximum fill is
half full. Insert the blue LV Barrier piston. Allow an air gap between piston and fluid as shown.
(If you are using the SmoothFlow
TM
piston, push the white piston down until it comes in contact
with the fluid.)
2.
Attach the syringe to the EFD adapter assembly.
3.
Snap the safety clip tightly closed to prevent any dripping.
4.
Remove the tip cap and attach a precision dispense tip.
5.
Set air pressure at 5 psi (0.3 bar).
6.
With the syringe barrel pointing down over a container, unsnap the safety clip.
Press and hold the foot pedal to fill the tip.
7.
As a drop begins to form at the end of the tip, slowly turn the vacuum
regulator knob counter-clockwise to stop the drip. Wipe the tip and adjust
vacuum as necessary.
8.
Rest the tip on the Dot Standards sheet. Press the foot pedal and release.
Check the dot size. Increase or decrease by adjusting pressure or time as needed.
1/2 maximum fill
LV Barrier
Air gap
Helpful Hint
For low viscosity fluids,
use an EFD filter trap
(#1000FLT-Y). This filter
trap will impede the
flow should the liquid
be sucked back
towards the dispenser.