impeller.net The Online Pump Magazine

17.06.2015

Low Flow, High Accuracy Internal Gear Pumps

Michael Smith Engineers

The extensive MZR range of low flow, miniature, positive displacement micro annular gear pumps provide precise, accurate and smooth, low pulse pumping and dispensing of a wide variety of liquids, including low and high viscosity fluids. Designed and manufactured to the highest standards by HNP Mikrosysteme in Germany and distributed in the UK by Michael Smith Engineers, the ultra-compact size and low mass of these pump and motor units ensure that they can be easily incorporated into the designs of many systems and are well suited to OEM applications.

The range comprises six series of pumps, all of which provide smooth, accurate, virtually pulse-free liquids pumping and dispensing, along with additional features and benefits depending on the model. For example, the High Performance Series constructed in stainless steel are for pumping low and high viscosity liquids of 0.3 to 1,000,000 cP at capacities from 0.0015 to 1152 ml/min at differential pressures up to 100 bar.

As the name suggests the Low Pressure Series, also in stainless steel, are designed for handling low viscosity liquids from 0.3 to 1,000 cP covering capacities from 0.0015 to 1152 ml/min at differential pressures to 5 bar. These are ideal for less demanding applications, such as transferring low volumes of non-lubricating liquids.

The Hermetic Inert Series which feature leak-free magnetic couplings, Hastelloy-C construction with SiC and Tungsten Carbide wetted parts, are designed to withstand the challenges of more aggressive liquids. They can handle liquids with viscosities from 0.3 to 1,000 cP, capacities from 0.024 up to 1152 ml/min at differential pressures to 60 bar.

The Magnetic Hermetic Series also feature stainless steel wetted materials with a leak-free magnetic coupling and integral controller and are suitable for handling liquids which tend to crystallise, or are moisture sensitive.
They handle capacities from 4.8 to 72 ml/min at differential pressures to 5 bar and liquids with viscosities from 0.3 to 1,000 cP.
Pumping applications requiring a wider choice of chemically resistant wetted materials will appreciate the Modular Pump Series which handle capacities from 0.0015 to 299 ml/min at differential pressures to 40 bar. They are suitable for liquids with viscosities from 0.3 to 10,000 cP.

Where applications require pumps for an environment with an explosive atmosphere, MZR’s High Performance Series and Hermetic Inert Series with ATEX motors are the best option. Available in Stainless Steel or Hastelloy C construction, these models are for liquids with viscosities from 0.3 to 5,000 cP and can handle capacities from 0.0015 to 1152 ml/min at differential pressures to 80 bar.

All MZR micro-annular gear pumps are designed to deliver low pulsating flows and can be used on non-lubricating liquids. Their output is accurate and precise (typically to ±1% subject to duty parameters) they have low dead volumes and as described above, there is a very wide choice of wetted material options and combinations. They are ideal for OEM system builders, analytical instrumentation manufacturers, fuel cell development, continuous processing applications and low volume dosing, dispensing applications or wherever accurate, smooth, virtually pulse-free pumping is required from a compact, lightweight pump.

Picture: Michael Smith Engineers

Source: Michael Smith Engineers

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