Compare Zaxis Metering Pumps

Start with the required dispense volume and rate, then match wetted materials, fluid viscosity and control interface. M-Series covers microliter dispensing; V-Series and VS10-Series address milliliter and higher-volume configurations; eVmP1 and eVmP2 package configured pumps in benchtop or dual-pump enclosures.

Select a pump head, adjustment mechanism, dispensing drive and controller as a configuration—not as interchangeable specifications. The comparison above is a shortlist, not evidence that every listed maximum can be reached together with every fluid. Use the following boundaries to decide what to verify on your actual dispensing system.

Displacement adjustment is different from dispensing drive

In eVmP, electronic adjustment physically changes the pump-head angle relative to the drive, changing piston stroke length and displacement. A precision stepper actuator adjusts volume; the dispensing drive is selected separately as stepper or servo. Changing cycle speed is not the same as changing displacement. See the eVmP mechanism and configuration guide and operating manual, section 1.2.2.

Valveless describes the absence of traditional supply/discharge check valves in the ceramic-piston mechanism. It does not establish universal chemical compatibility, zero service requirements or an obstruction-free fluid path. The installed head, seals, tubing, fittings and nozzle still need a compatible fluid and cleaning procedure. The manual identifies fluid-dependent slip and abrasive damage risks; qualify pressure, viscosity, speed and service conditions together.

An evidence packet for the application review

Before trials, write the acceptance rule and identify the exact head, drive, controller/firmware, wetted path, fluid, temperature, viscosity, supply condition, outlet pressure, nozzle, target dose and cycle rate. State whether the requirement applies at startup, steady operation, after idle time or across a recipe change. Agree the measurement method and number of observations with the responsible engineering team rather than adopting an unexplained sample count.

Request the raw observations, target, mean delivered dose, error basis and repeatability statistic with units. Keep calibration/reference records, operating settings and exclusions with the results. If mass is used to infer volume, document the density basis and conditions. For the selected fluid, include startup/priming, cleaning, service and fault-recovery checks in the agreed protocol. This is a proposed evidence checklist, not a Zaxis performance test report.

Use M-Series, V-Series and VS10-Series for head/drive discussions. eVmP1 and eVmP2 are enclosure-system routes; their installed pumps determine delivery capability. Review the dispensing applications, then request a configuration review with the evidence requirements attached.

Technical sources and scope

Mechanism and service: Zaxis eVmP Operating Manual, edition 24.10, sections 1.2.2, 2.1.3–2.1.5 and 5.1–5.2. Adjustment versus drive and separately stated accuracy, CV and resolution: Zaxis eVmP datasheet, Rev 3. Current website configuration context: eVmP family guide. Historical document values need configuration/revision confirmation; do not use an old VS6 specification as a current VS10 recommendation.