Microteeth Ring Pumps - Maximum Precision for Microdosing and Demanding Conveying Processes

The technical starting point is the corrosive nature of aqueous urea solutions, which requires a housing material made of ＜b＞zirconia or ＜/b＞ ＜b＞316L stainless steel＜/b＞. The mechanical ＜b＞design of micro-tooth ring pumps for industrial applications＜/b＞ is aimed at achieving pulsation-free injection to control exhaust emissions in the milligram range. Inaccurate dosing results in failure to meet the emission class; at HARTON, we validate the ＜b＞resistance of ceramic bearings to deionized water＜/b＞, as AdBlue residues tend to crystallize.

The architecture of the Gerotor principle delivers an absolutely uniform mass flow without the peaks characteristic of a piston pump. The mechanical logic behind ＜b＞pulsation-free microdosing＜/b＞ enables more homogeneous mixing of the additive into the exhaust gas stream. The result is a more efficient catalytic reaction; unlike standard solutions, the ＜b＞micro-toothed ring pump＜/b＞ consistently delivers the required pressure to the injector, which ＜b＞significantly ＜/b＞increases ＜b＞process reliability in additive injection ＜/b＞.

The technical basis consists of crystalline urea particles that can precipitate at low temperatures. The mechanism of action of ＜b＞the wear protection provided by hard ceramic components＜/b＞ (e.g., ＜b＞zirconia＜/b＞) prevents these particles from scratching the tooth flanks. The result is consistent dosing accuracy throughout the vehicle’s entire service life; HARTON validates the hardness of the rotors in comparison to ＜b＞cemented carbide＜/b＞ to determine the optimal pairing for cold-start operation.

The technical basis is the rapid change in exhaust gas volume during acceleration. ＜b＞Controlling micropumps via high-resolution controllers＜/b＞ enables the pump to respond within milliseconds. The mechanical result is a demand-based additive supply in every load condition. With slower systems, this would result in a brief spike in nitrogen oxide levels; we provide the appropriate ＜b＞interfaces for digital monitoring of minute quantities via ＜/b＞automotive bus systems.

Due to the high ambient temperatures in the engine compartment (up to 120°C), the housing and ＜b＞inner rotor ＜/b＞expand ＜b＞at different rates ＜/b＞. Thermal considerations require the selection of materials with similar ＜b＞coefficients of thermal expansion for miniature gear components＜/b＞. Thermal distortion would cause the pump to seize; HARTON engineers validate the material pairings in climate chambers to ensure the ＜b＞micro-pump’s service life ＜/b＞under real-world conditions in automotive applications.

The architecture allows for ＜b＞a modular design of micro-dosing stations＜/b＞ for rapid integration into various engine test benches. The mechanical operating mechanism enables the pump to be replaced without draining the entire system, using ＜b＞Luer-Lock quick-connect fittings＜/b＞. This results in significant time savings during test stand setup; we supply the appropriate ＜b＞OEM chassis＜/b＞ with integrated power electronics for ＜b＞micro-dosing systems＜/b＞.

We validate system integrity by ＜b＞monitoring the operating pressure in microfluidic systems＜/b＞, which immediately detects even the slightest pressure drops (indicating a leak). This mechanism prevents chemicals from leaking into the engine compartment. The result is enhanced vehicle safety; our quality assurance team documents the leak-tightness of the ＜b＞hermetic micro-gear ring systems＜/b＞ under extreme vibration loads (shaker test).

The most important criteria are corrosion resistance to urea and electrical power consumption (12V/24V vehicle electrical system). The logical sequence of ＜b＞technical selection criteria for positive displacement pumps＜/b＞ often leads to the selection of media-separated ＜b＞magnetic couplings＜/b＞. The result is protection of the engine electronics against aggressive vapors; our project engineers create specific specifications for ＜b＞B2B micro-pump procurement＜/b＞ in the automotive industry.

EU legislation requires that exhaust gas aftertreatment systems function continuously. The ＜b＞MTBF analysis for process-critical micropumps＜/b＞ serves as proof to regulatory authorities of the system’s reliability. A substandard MTBF can result in a recall of the vehicle model; HARTON validates the service life of ＜b＞gear ring components＜/b＞ in long-term field trials to provide assurance to OEM customers.

We validate the pump by ＜b＞testing its dosing accuracy after cleaning cycles＜/b＞ (e.g., after flushing with deionized water prior to winter storage). The mechanical design ensures that no crystal residues will block the pump during the next startup. The result is maintenance-free operation over the entire service life; our Quality Assurance department provides validated cleaning instructions for the ＜b＞positive displacement pumps in the ＜/b＞service area.

The technical basis is the architecture consisting of an inner and an outer rotor, which are often made of different materials such as cemented carbide and ceramic. The thermal logic dictates that, ＜b＞in miniature gear components＜/b＞, changes in temperature (e.g., from 20°C to 80°C) cause the ＜b＞coefficients of thermal expansion＜/b＞ to alter the radial clearance by amounts in the micrometer range. The result is either the rotors seizing up or a massive loss of efficiency; our project engineers at HARTON validate these tolerances using optical measurement technology to ensure process stability in ＜b＞chemical microreaction technology＜/b＞.

The design uses a ＜b＞magnetic coupling＜/b＞ to isolate the pump chamber from the atmosphere with absolutely no leakage. This mechanism eliminates the dead spaces and particle ingress that are unavoidable with shaft seals, which is essential for ＜b＞process reliability in additive injection＜/b＞. One risk is demagnetization caused by external magnetic fields; our quality assurance department validates the field stability to prevent the coupling from slipping when handling viscous media, as this would result in an immediate stoppage of micro-dosing.

The technical starting point is the tribological interaction between the medium and the rotor surface. The physical logic behind the influence of surface roughness on wettability at the micro level states that, on extremely smooth surfaces (Ra ＜ 0.1 μm), adhesive forces can significantly increase the breakaway torque. The result is a delayed start or step losses in the drive; our engineers at HARTON optimize the surface structure so that a stable hydrodynamic lubricating film is established even at minimal rotational speeds.

In microchemistry, particles larger than 5 μm cause immediate blockage of the narrow functional gaps. The use of standard stainless steel bearings is a no-go, as their abrasion compromises the purity of the media. The mechanical cause-and-effect chain requires the use of ＜b＞zirconia or ＜/b＞ ＜b＞sapphire bearings＜/b＞, which exhibit extremely high hardness. Failure to comply results in total failure of the ＜b＞high-precision micro-dosing pump＜/b＞; for process-related reasons, HARTON therefore excludes metal-on-metal friction pairs in these systems.

The technical starting point is the integration of ＜b＞tungsten carbide or ＜/b＞ceramic components into the ＜b＞gear ring geometry＜/b＞. The mechanism ＜b＞by which ceramic hard-material components provide wear protection＜/b＞ minimizes abrasion caused by crystalline precipitates in the media. The result is excellent repeatability over millions of cycles; we validate service life in long-term tests, in which ceramic rotors can increase the MTBF by a factor of 10 compared to steel variants.

The design is based on the continuous displacement action of the eccentric gear ring, which—unlike peristaltic pumps—does not generate periodic pressure fluctuations. The mechanical principle behind ＜b＞the benefits of pulsation-free delivery in the sub-microliter range＜/b＞ enables extremely uniform laminar flow in capillary systems. The result is higher resolution in analytical applications; HARTON provides specific performance data for micro-tooth ring pumps in the microliter range that guarantee oscillation amplitudes of less than 1% of the flow rate.

The technical starting point is the integration of the pump with a ＜b＞BLDC motor＜/b＞ or ＜b＞stepper motor＜/b＞. The ＜b＞control of micropumps via high-resolution controllers＜/b＞ uses encoders with several thousand increments per revolution to achieve the smallest volume increments (nanoliters). Inaccurate control results in an unstable baseline in chromatography; our manufacturing specialists calibrate the control algorithms individually to the system viscosity in order to eliminate control overshoot.

By manufacturing the housing covers with ＜b＞optical parallelism＜/b＞ in the sub-micrometer range, the axial gap to the rotor is minimized. Mechanical logic dictates that this is the only way to prevent volumetric backflow at high back pressures (up to 100 bar). The consequence of imprecise flatness is a decrease in microfluidic efficiency; in our production process, we perform interferometric testing on every industrial micro-gearing pump to ensure a volumetric efficiency of ＞90%.

In ＜b＞pharmaceutical filling＜/b＞, unplanned downtime leads to the loss of expensive batches. The ＜b＞MTBF analysis for process-critical micropumps＜/b＞ is based on monitoring motor current and torque fluctuations. The logic chain detects incipient sticking or deposits on ＜b＞the inner rotor＜/b＞ before mechanical overload occurs. This results in a scheduled maintenance intervention; HARTON documents wear trends to optimize the maintenance intervals for your ＜b＞analytical micropumps＜/b＞.

The most important criteria are the chemical compatibility of the seals (e.g., ＜b＞FFKM＜/b＞) and the required dosing accuracy in accordance with the ＜b＞Technical Selection Criteria for Positive Displacement Pumps＜/b＞. From a mechanical standpoint, it is necessary to verify whether the pump is designed for ＜b＞zero-stroke conditions＜/b＞(dosing against closed valves). The consequence of an incorrect selection is the rupture of capillaries; our project engineers prepare a detailed ＜b＞specification＜/b＞ sheet for every ＜b＞industrial micro-tooth-ring pump application＜/b＞, including all system interfaces.

In fuel cell systems, the precise delivery of water-methanol mixtures is the starting point. The mechanical logic: Different ＜b＞coefficients of thermal expansion in miniature gear components＜/b＞ (e.g., stainless steel housing vs. ceramic rotor) lead to changes in clearance dimensions when ambient temperatures fluctuate between -20°C and +60°C. The result is a decrease in ＜b＞microfluidic efficiency＜/b＞ during winter operation; at HARTON, we validate the geometry of ＜b＞the gerotor micropumps＜/b＞ to ensure that the start-up pressure remains sufficient at all times, even at maximum clearance.

The system architecture integrates electronic pressure sensors via ＜b＞interfaces for digital monitoring of minute volumes＜/b＞. The mechanism immediately detects pressure spikes that indicate the onset of clogging in the capillary channels. An uncontrolled pressure increase results in the mechanical destruction of the sensitive fuel cell membrane; when ＜b＞integrating micro-toothed ring pumps＜/b＞, our project engineers often specify safety routines in the firmware that immediately shut down the ＜b＞BLDC motor＜/b＞ when the pressure reaches 5 bar.

The technical basis is the continuous reaction at the catalyst, which requires an absolutely constant mass flow. The mechanical logic of ＜b＞pulsation-free microdosing＜/b＞ prevents local concentration peaks that would reduce the cell’s efficiency. The result is a stable electrical output; unlike piston pumps ＜b＞,＜/b＞ the ＜b＞micro-tooth ring pump＜/b＞ delivers a laminar flow without check valves.

Deionized water has a highly corrosive effect on metal surfaces due to the removal of ions. The ＜b＞resistance of ceramic bearings to deionized water＜/b＞ takes advantage of the chemical inertness of ＜b＞aluminum oxide＜/b＞ to completely prevent corrosion. The mechanical result is wear-free continuous operation for thousands of hours. In the case of metal bearings, this would result in failure due to pitting corrosion; HARTON therefore designs exclusively metal-free bearing assemblies for ＜b＞use in fuel cell technology＜/b＞.

The architecture is designed ＜b＞for integration into automated liquid-handling systems＜/b＞ via a compact CAN bus controller. The operating mechanism allows the pump speed to be linked to the stack’s current power demand. The result is demand-based dosing with maximum efficiency; we validate the communication speed ＜b＞of the micro-pump control system＜/b＞ to ensure it can respond to load changes within milliseconds.

The starting point is the presence of residual fluid in the tooth chambers. The physical logic ＜b＞behind how surface roughness affects wettability at the microscale＜/b＞ determines whether the pump immediately forms a hydrodynamic film at startup or starts up dry. The consequence is potential wear on ＜b＞the inner rotor during ＜/b＞the startup process; HARTON uses laser-textured surfaces to optimize lubricant adhesion in ＜b＞fuel cell technology dosing＜/b＞.

We validate the consistency of the flow rate following simulated vibration and temperature tests. ＜b＞Testing the dosing accuracy after cleaning cycles＜/b＞ ensures that the ＜b＞shaft seal of the micropump＜/b＞ remains leak-tight even under vibration. The mechanical result is protection against fluid leakage in the vehicle; our quality assurance department documents the leak-tightness of the ＜b＞hermetic micro-gear ring systems＜/b＞ as part of the safety acceptance process.

The analysis is based on monitoring the mechanical wear of the ＜b＞gear ring set＜/b＞. The ＜b＞MTBF analysis for process-critical micropumps＜/b＞ uses service life simulation models to predict the optimal replacement time. The result is the prevention of blackouts caused by pump failure; HARTON technicians validate the service life of the ＜b＞carbide components＜/b＞ for 24/7 operation in decentralized energy supply systems.

By ＜b＞minimizing internal leakage through precise manufacturing tolerances＜/b＞, we ensure that exact pressure is built up even at the lowest rotational speeds. The mechanical design prevents methanol from flowing back through the housing gaps. The result is precise control of the fuel-to-air ratio; we inspect the flatness of the housings on a coordinate measuring machine to qualify the ＜b＞high-precision micro-gear pumps＜/b＞ for peak performance.

The most important criterion is the power consumption of ＜b＞the BLDC motor＜/b＞ in relation to its flow rate and size. The logical sequence of ＜b＞technical selection criteria for micro-displacement pumps＜/b＞ often leads to the choice of lightweight plastic housings such as ＜b＞PEEK＜/b＞. The result is a reduction in the weight of the entire system; our project engineers create specific data sheets for this purpose to support ＜b＞B2B micro-pump procurement＜/b＞ in the renewable energy sector.

The technical starting point is the biocompatibility of the wetted materials, such as ＜b＞PEEK and ＜/b＞ceramics. The ＜b＞certification of micropumps for medical technology follows ＜/b＞the principles of FDA compliance and cleanroom manufacturing. Inadequate validation can result in the denaturation of sensitive proteins; HARTON validates the surface properties as part of its quality assurance process to ensure that no chemical interaction with the serum occurs and that the integrity of the in vitro diagnostic device is maintained.

For low-viscosity fluids such as buffer solutions, the ＜b＞flow behavior of these fluids in microchambers＜/b＞ is characterized by Reynolds numbers in the laminar range. The mechanical principle of ＜b＞positive displacement micro-pumps utilizes ＜/b＞the formation of an eccentric chamber to force the fluid through the system. Insufficient venting results in compressibility effects caused by microbubbles; our engineers optimize the geometry of ＜b＞the toothed ring inlets＜/b＞ to proactively remove gas inclusions.

In analytical applications, residues lead to cross-contamination. ＜b＞Testing the dosing accuracy after cleaning cycles verifies ＜/b＞whether the seals and rotors have undergone dimensional changes due to thermal or chemical stress (e.g., autoclaving). Mechanical principles show that even micro-distortion shifts the flow characteristic curve. The result is inaccurate sample analysis; we document repeatability after 500 cycles as proof of the quality of our ＜b＞high-precision micro-gear pumps＜/b＞.

The architecture, featuring a ＜b＞modular design of micro-dosing stations＜/b＞, allows for the quick replacement of pump heads when changing media. The mechanical operating mechanism is based on precision couplings between the motor and ＜b＞the inner rotor＜/b＞. This results in a drastic reduction in downtime in the laboratory; HARTON often supplies these systems on compact ＜b＞OEM chassis＜/b＞ with integrated electronics for direct integration into automated analyzers.

Micro-toothed ring pumps (often referred to as Gerotor micro-pumps) have a functional clearance of ＜3 μm. Particle ingress leads to an immediate increase in friction and plastic deformation of the tooth flanks. The logical sequence of damage culminates in the shaft seizing up. The result is system failure; to ensure the ＜b＞service life of the micro-pump＜/b＞, we at HARTON often integrate microfilters directly into the ＜b＞capillary connection＜/b＞ to proactively prevent mechanical damage.

Deionized water has a highly corrosive effect on metal surfaces due to ion leaching. The ＜b＞resistance of ceramic bearings to deionized water＜/b＞ is based on the chemical inertness of ＜b＞aluminum oxide or ＜/b＞silicon carbide. The mechanical result is wear-free operation without corrosion. In the case of metal bearings, this would result in failure due to pitting corrosion; HARTON therefore designs exclusively metal-free bearing assemblies for ＜b＞use in analytical instrumentation＜/b＞.

＜b＞The eccentric arrangement of the inner and outer rotors＜/b＞ allows the teeth to remain in continuous mesh. This mechanically creates crescent-shaped pumping chambers that constantly open and close without the need for a check valve. The result is ＜b＞pulsation-free microdosing＜/b＞ that, unlike syringe pumps, enables a continuous, uniform flow rate—which is crucial for microfluidic chips.

The system architecture incorporates digital pressure sensors to＜b＞ monitor operating pressure in microfluidic systems＜/b＞. The mechanism detects blockages in capillaries or valve malfunctions in real time. Unnoticed excess pressure can cause microchannels to rupture; to address this, our engineers provide high-frequency ＜b＞interfaces for digital microvolume monitoring＜/b＞ to shut down the process within milliseconds.

We validate the radial clearance between the shaft and ＜b＞the plain bearing using ＜/b＞electronic precision gauges. ＜b＞Monitoring bearing clearance in micro-toothed ring pumps＜/b＞ reveals wear trends that lead to vibrations and, consequently, a decline in dosing accuracy. A measurable threshold is an increase in clearance of ＞2μm; HARTON QS uses this data to perform a thorough MTBF analysis in order to plan the replacement of precision components in a timely manner.

The technical starting point is connecting the pump to the fluid system via ＜b＞Luer-Lock＜/b＞ or special threaded connections. The mechanical design requires minimizing dead volume in the connection area to prevent carryover. The consequence of improper design is the formation of air bubbles, which compromise dosing accuracy; for ＜b＞B2B micro-pump procurement＜/b＞, our project engineers always specify the connection set appropriate for the medium to ensure ＜b＞microfluidic efficiency＜/b＞.

The technical foundation is the high-precision architecture of the ＜b＞zirconia＜/b＞ rotor sets, which operate within a housing made of ＜b＞PEEK or ＜/b＞stainless steel. The mechanical principle is that, unlike metallic materials, ceramic components are completely wear-resistant and chemically inert toward aggressive preservatives. As a result, particle contamination of the active ingredient solution is prevented; at HARTON, we validate the surface finish after every production batch, since even the slightest irregularities could disrupt ＜b＞pulsation-free microdosing＜/b＞ and lead to underdosing in the nanoliter range.

In pharmaceutical manufacturing, the thermal stress caused by steam sterilization (SIP) at 121°C is the primary source of material stress. Using simple ＜b＞FKM seals＜/b＞ is a no-go, as they harden when exposed to heat and lose their axial preload on the rotors. This mechanism leads to an uncontrolled increase in internal leakage (slip). The result is a deviation in the fill volume from the target value; our technicians at HARTON therefore perform a ＜b＞dosing accuracy test after each cleaning cycle＜/b＞, relying primarily on ＜b＞FFKM seals＜/b＞ to maximize the ＜b＞micro-pump’s service life＜/b＞.

The design enables the ＜b＞integration of micro-geared pumps into laboratory systems＜/b＞ thanks to their extremely compact dimensions and direct mounting on ＜b＞OEM chassis＜/b＞. The operating mechanism is based on control via ＜b＞BLDC motors＜/b＞, which can achieve over 1,000 dosing cycles per hour at constant pressure. The result is a massive increase in sample capacity; HARTON validates the thermal stability of the drives during continuous operation to ensure that the motor’s waste heat does not compromise the integrity of temperature-sensitive enzymes.

A technical error occurs when the rotors are assembled without taking into account the specific ＜b＞eccentricity of the ＜/b＞housing. Even with minimal axial misalignment, the mechanical operating mechanism causes localized overload on the ＜b＞slide bearings＜/b＞, which causes the ceramic components to shatter. The result is a total system failure; our manufacturing specialists therefore use specialized assembly jigs to ensure ＜b＞zero clearance and ＜/b＞radial alignment within the sub-micrometer range.

The starting point is the low dynamic viscosity of aqueous buffer solutions, which flow back through the functional gap at higher pressures. The mechanical logic behind ＜b＞the flow behavior＜/b＞ of ＜b＞low-viscosity media in microcapsules＜/b＞ shows that volumetric efficiency drops significantly at back pressures of 20 bar or higher. The result is an increase in drive speed, which in turn intensifies the shearing of the medium; at HARTON, we validate the gap dimensions interferometrically to proactively minimize this backflow.

The technical starting point is the integration of flow sensors via ＜b＞interfaces for digital micro-flow monitoring＜/b＞, such as RS-485 or CAN bus. The monitoring mechanism compares the target strokes of ＜b＞the stepper motor with ＜/b＞the actual flow rate in real time. The result is seamless batch traceability; our engineers provide validated software modules to support the ＜b＞certification of micropumps for medical technology and ＜/b＞pharmaceutical applications.

Particles in the micrometer range act as nucleation sites for crystallization or denaturation in biological samples. The mechanical cause-and-effect mechanism ＜b＞for preventing particle contamination in micropumps＜/b＞ is based on the use of ＜b＞cemented carbide and ＜/b＞sapphire, which do not generate any internal wear. The result is consistently stable reagent quality; HARTON validates the absence of particles through flushing processes in an ISO Class 7 cleanroom.

The analysis is based on continuous torque monitoring of ＜b＞the BLDC motor＜/b＞. The logical sequence of ＜b＞the MTBF analysis for process-critical micropumps detects ＜/b＞gradual deposits on the tooth flanks through an increase in no-load current. The result is predictive maintenance before failure occurs; we statistically validate these trends to extend the ＜b＞service life of the micropump＜/b＞ to over 20,000 operating hours under real production conditions.

The technical starting point is the heat input from the motor into the pump head. The thermal logic means that the ＜b＞thermal expansion coefficients of miniature gear components＜/b＞ increase the axial clearance, which in turn increases slippage. The result is a decline in dosing precision over the course of operation; HARTON therefore often integrates thermal insulators or active cooling flanges into the ＜b＞modular design of micro-dosing stations＜/b＞.

The most important criteria are the definition of the smallest dosing increments and the chemical resistance of the housing (e.g., ＜b＞aluminum oxide＜/b＞). The logical sequence of ＜b＞specifications for industrial micro-gear pumps＜/b＞ also requires specifying the maximum differential pressure. An inaccurate specification can result in the failure of ＜b＞analytical micropumps＜/b＞ due to overload; our project engineers create detailed performance curves for your specific operating point.

The starting point is the dispensing of synthetic oils in quantities of less than 1 µl per cycle. The design of ＜b＞the maintenance-free micro-tooth ring pump＜/b＞ utilizes ＜b＞sapphire bearings and ＜/b＞ ＜b＞carbide shafts＜/b＞ to almost completely eliminate mechanical friction. The mechanical logic of ＜b＞the positive displacement micro-pumps＜/b＞ allows for precise volume control without dripping. A malfunction would result in over-lubrication of the components; we validate the ＜b＞zero-stroke behavior＜/b＞ in our quality assurance process to ensure that the liquid thread breaks off with millisecond precision.

The technical starting point is the radial guidance of the shafts with a tolerance of ＜ 2 µm. The cause-and-effect mechanism involved in ＜b＞monitoring bearing play in micro-gear pumps＜/b＞ shows that even the slightest wear caused by contaminants in the oil shifts the ＜b＞eccentricity of the ＜/b＞gear ring. The result is an unstable flow rate; HARTON engineers perform an ＜b＞MTBF analysis for process-critical micro-pumps＜/b＞, and by using ＜b＞tungsten carbide rotors＜/b＞, we ensure that dosing precision is maintained over the long term.

The architecture of the Gerotor principle ensures a continuous flow without pressure surges. The mechanical design, which leverages＜b＞the advantages of pulsation-free delivery in the sub-microliter range＜/b＞, enables precise wetting of even the smallest tooth flanks without splashing the medium. The result is a clean assembly environment; unlike piezo systems, the ＜b＞Analytik Pump Gear＜/b＞ delivers a stable jet that can be ＜b＞precisely ＜/b＞positioned via the ＜b＞capillary connection ＜/b＞.

One thing to avoid is the use of pumps that produce metallic abrasion, as even the tiniest metal particles could jam the watch’s escapement. The mechanical operating mechanism of the ＜b＞micropump＜/b＞ is therefore based on a tribologically optimized combination of ceramic and carbide. The result is residue-free lubrication; at HARTON, we validate the particle-free nature of the ＜b＞OEM micro-pump＜/b＞ through automated particle counts during test runs.

The technical starting point is the control of ＜b＞the stepper motor with ＜/b＞microstep resolution. ＜b＞Controlling micropumps via high-resolution controllers＜/b＞ makes it possible to dynamically adjust the oil flow based on the frictional resistance of the movement. The result is optimized timekeeping accuracy; our manufacturing specialists provide the necessary ＜b＞interfaces for digital micro-volume monitoring＜/b＞ to fully automate the documentation of the assembly process.

The most important criteria are the minimum flow rate per revolution and the viscosity stability of the oil. The mechanical logic behind the ＜b＞technical selection criteria for positive-displacement pumps＜/b＞ requires a pump with minimal dead volume in ＜b＞the Luer-Lock connection＜/b＞. The consequence of an incorrect choice is uncontrolled oil leakage; HARTON project engineers often specify special nozzle attachments to increase the surface tension at the outlet.

The technical starting point is the surface tension of the watch oil on the gear flanks. The physical logic behind ＜b＞the influence of surface roughness on wettability at the microscale suggests ＜/b＞that a surface that is too smooth can delay the formation of the lubricating film. The result is an increased breakaway torque; we validate the surface structure of ＜b＞the miniature gear pumps＜/b＞ to ensure immediate suction even after long periods of inactivity.

The architecture allows for the ＜b＞modular design of micro-dispensing stations with ＜/b＞various pump heads for different oil viscosities (from low-viscosity to grease-like). The mechanical design enables quick replacement of the units on the robot arm. This results in reduced changeover times; HARTON supplies compact ＜b＞OEM chassis＜/b＞ that are specifically optimized for integration into automated assembly machines.

We validate volumetric equality using gravimetric measurements on microbalances. ＜b＞Testing the dosing accuracy after cleaning cycles ensures ＜/b＞that solvent residues have ＜b＞not ＜/b＞impaired the lubrication of the ＜b＞plain bearings ＜/b＞. The mechanical result is protection against shaft seizure; our quality assurance department documents the calibration values for every ＜b＞micro-toothed ring pump manufactured by Industrie＜/b＞ in the precision engineering division.

Maintenance is based on regular inspection of ＜b＞the micropump’s shaft seal＜/b＞. ＜b＞Preventive maintenance of micro-dosing systems＜/b＞ uses optical sensors to detect leaks inside the housing. This prevents oil leaks that could contaminate the cleanroom; at HARTON, we validate maintenance cycles based on the number of cycles to ensure 100% process reliability.