Nanojet dispenser heads

Nanojet dispenser heads feature a miniaturized solenoid valve and a glass capillary nozzle through which the liquid is emitted. The liquid is transported from the reservoir to the dosing head by means of gas pressure.

The special nozzle shape provides laminar liquid flow, which prevents liquid from atomizing, thus ensuring that liquid is restricted to the target area. The possible nozzle diameters range from 50 μm up to 500 μm.

The dispenser volume depends on gas pressure, solenoid valve opening time, nozzle diameter and liquid viscosity. Electronic control of the valve in combination with the pressure control ensures a precisely dispensed volume.

Here the work pressure is adjusted between 500 and 3500 hPa with a variation of 1 %. The valve opening time can either be set between 3 ms to 2 s or via trigger input. A serial port is optional available. For functional testing a toggle switch allows the manual opening of the valve. The small dimensions of the heads are particularly advantageous for integration in existing systems.

Nanojet Piezovalve NJ-K-4...

This high performance valve was developed for the dispensing of liquids in a viscosity range of up to 2000 mPas.The volume range reaches from 8 nl up to 10 μl per dispensing cycle.

The liquids are transferred without impact of the nozzle just as with all other microdrop microdispenser systems. In combination with the very precise switching performance of the piezovalve this results in a very high volume accuracy of < 1%.

The improved system allows automatically identification of the valve and its spezific piezo calibration data. The intelligent upgraded processor guaratees a very precise and linear time base (advanced timing). The number of dispensing cycles are counted and stored in the valve (cyclecount), which enables the user to include individual maintainance concepts in dependence of the dispensing process.

The flat design, with a thickness of only 10 mm, allows the combination of several valves in a compact array. External control via a host computer is possible with interfaces like RS232C, RS485, SPS or others.
The dispenser nozzles can be exchanged even by an unskilled user. This is possible due to the patented quickexchange system which reduces down times, due to nozzle clogging, to a minimum.

Besides, the system ensures resistance also agains unusual operating errors.