The new pump NSH 10 is not designed to operate at such low speeds (Rated speed of the pump shaft 1000 rev / min) and has a constructive overflow capacity, which just shows an increase in output pressure at low engine speeds. The more wear and tear pump lower frequency of rotation of the shaft and lower the viscosity of the fluid, the greater the ability to bypass. Dosage error can exceed all expectations. And when you consider the fact that sometimes the resin sold already divorced water and at the same concentration and viscosity, respectively, is still below that in this case, more can be said about the accuracy of dosage? And not everyone will be able to rotate the motor shaft of the pump under load. Claimed manufacturer's recommended engine power to the shaft NS 10 – 8 kW. NS 6, structurally the same as the NS 10. The main difference is that the volume of the pump is 6 cm3.
This suggests that the pump is 100 rpm should give 0.6 liters fluid under ideal conditions (laid turnovers, minimal wear, etc.). So, for 2uh liters per minute, we need to rotate the shaft at a speed of 333 rev / min. Dosage error in these revolutions, will konechnozhe minimal in comparison with the NS 10. Only here the price of these pumps is high, and not so easy to buy them. Pumps of this type are rare in the industry. There are, of course, a big plus when using the NSH.