Gardco PG-1 Benutzerhandbuch - Seite 6

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2.3 Filling the Manual Dispenser

For testing with different liquids it is recommended to use a separate dispensing unit for each

test liquid to avoid contamination of test liquids. To fill the manual dispensing unit, use the

procedure below.

PLEASE NOTE! The manual dispenser can not be used for test liquids of high viscosity or

quickly drying solvent inks (e.g. rotogravure ink.) To apply liquids of high viscosity, please

see Section 2.7.

Remove the manual dispenser from its

storage space by unscrewing the knob at the

short end of the instrument, next to the light

button.

Rotate the volume wheel until it is in

the top position under the applicator knob.

Insert the dispensing tip into the test liquid

and fill the dispensing unit with a few pump

strokes. Move the plunger slowly to avoid air

sucked into the dispensing unit from the rear

end.

Turn the dispensing unit with the tip pointing

upwards and tap gently on the dispenser to bring air bubbles inside the liquid to the top.

Push the plunger slightly forward to remove the air at the tip. Rotate the volume wheel

forward until it barely touches the end of the dispenser. Then press at the end of the shaft

and a small droplet should appear at the dispensing tip. Make sure there are no visible

air bubbles inside the liquid system.

Check the PTFE sleeving is adapted at the dispensing tip. Without this sleeving the test

liquids might climb on the outside of the tip because of wetting forces.

Insert the dispensing unit into the dispensing bridge.

PLEASE NOTE! If different test liquids are to be used it is extremely important to avoid

contamination as this will change the liquid properties resulting in an erroneous contact

angle. To avoid tedious cleaning of the manual dispenser each time a different liquid is used,

it is recommended to use dedicated dispensers for each liquid.

Dispensing tip

Fig. 2.2 Manual Dispenser

Volume wheel

Applicator knob

Plunger