What do these products do in this instrument?
Piston Pumps: Discrete Metering in Analytical Branches
Deliver specified volumes in suitable sample, standard or reagent branches, coordinated with valve position, probe outlet and reaction position. Check working stroke, refills and detection windows for each task.
EA, SM and TM provide options for comparing capacity, wetted configurations and installation space. Verify actual doses from working stroke and the complete wetted path; check system-liquid drive and direct sample contact with the pump head separately.
Distinguish piston displacement from actual received volume
Piston pumps use controlled displacement for discrete aspiration and dispensing. Sample may enter the head directly or remain at the probe tip while system liquid transmits displacement; wetted coverage, priming and cleaning differ. Map aspiration, holding, dispensing and replenishment paths first, then relate stroke to probe-tip delivery.
Combine metering, valve positions and container actions into a complete cycle
Delivery requires coordination of metering drive, source switching and receiving-end actions. Usable capacity must cover working volume and other cycle displacements, with replenishment in permitted windows. Check tip droplets, bubbles and shared residual liquid through the complete path; remeasure received volume after changing pump heads, tubing lengths or interfaces.
Translate actual branch conditions into configuration requirements
| Condition | To confirm |
|---|---|
| Working stroke | Define sample, standard and reagent tasks separately, with working doses, auxiliary displacement and refill windows for each method cycle. |
| Liquid contact and pressure | Map each source, valve state and receiving interface, including the actual direct-contact or system-liquid arrangement and pressure exposure. |
| Delivery and recovery | Measure received volume and arrival relative to the analytical window, then verify blanks and the first valid method result after switching or maintenance. |
Compare product configurations by the roles on this page
| Product | Configuration option | Conditions to verify |
|---|---|---|
| EA standard piston pump | Finite-stroke metering | Compare configurations by routine dose, total cycle displacement and wetted materials |
| SM miniature piston pump | Discrete metering in compact installations | Check installation space first, then validate working doses and actual accuracy |
| TM ultra-miniature piston pump | Discrete metering in limited space | Check installation space and configuration before measuring actual delivery; an ultra-miniature design does not imply a smaller reliable dose |
Confirm product roles in actual operation
Verify discrete delivery and actual liquid arrival against the analytical method window. After switching, interruption or maintenance, reconcile completed additions before repeating a command and assess blank and method recovery separately.
Are piston pumps of equal capacity directly interchangeable?
Also check wetted materials, interfaces, mounting, drive and pressure conditions. After replacement, recheck delivery, cleaning and first-dose recovery with the original sequence and actual liquids. Capacity is only one comparison criterion.
Configure metering, continuous supply, liquid washing and air-containing waste removal separately. See Laboratory Automation for platform scheduling.