The dispensers (also called “pipettes” or “jets”) follow the drop-on-demand principle, i.e., a drop is released exactly when the piezo ceramic actuator is triggered. This results in the bending of a silicon diaphragm behind the actuator and this in turn leads to a compression of the liquid inside the “pump chamber” and hence to the ejection of a droplet from the nozzle. After this, the ceramic returns to its initial state and the dispenser is refilled with liquid from the inlet. No valve is involved in this process.
Basically this process only works for low-viscous liquids up to a viscosity of about 5 mPa*s (5 cP). Liquids with lowering viscosity at elevated temperature may be used with our heatable dispensers.
Baiscally GeSiM offers piezoelectric microdispensers for two different drop volumes: The standard type SPIP emits drops between 0.6 and 1.1 Nanolitres. The other one is called PicPIP for drops of 0.1…0.2 Nanolitres. Basically the larger one has a wider viscosity range and is therefore easier to manage.
Two operation modes are available for the GeSiM dispenser: Drop bursts and continuous flow at frequencies up to 500…1000 Hz, depending on the liquid properties.
Both types of dispensers are available with different housings.
Please download the product brochure for more details and ordering information.
GeSiM piezoelectric dispensers are made by MEMS technologies. With this background we may support even difficult applications: Smart mixing of two liquids in the dispenser body, integrated dispensers with a inlined nozzles, heatable dispensers for liquids which lower it’s viscosity at elevated temperatures.
The internal reservoir of a piezoelectric dispenser is typically in the range of few Microlitres. For dispensing larger volumes cartridges can be fitted (Left image).
Please enquire for further details.
Heatable Dispenser with 3 mL Reservoir