Locate the source, drive and receiving position for this task
Required inputs are actual sample volume, remaining source volume, probe-tip height, aspiration/dispensing speed and system liquid. Confirm liquid contact, pressure and destination along each position in the diagram before assigning drive and connection responsibilities.
Design for minimum liquid level and bottom clearance
Specify vessel dimensions, minimum liquid level, working volume, needle travel and acceptable remaining volume. Balance needle bore and path volume against flow, particle risk and sample budget.
| Condition to compare | Information required | Selection affected |
|---|---|---|
| Probe-tip position | Immersion depth, bottom clearance and low remaining volume | Prevent aspiration of air or inlet blockage |
| Wetted surfaces | Probe bore, external surface and sample properties | Check delivery and residue |
| Tip-end actions | Withdrawal, transfer, dispensing and suck-back | Evaluate retained droplets and destination receipt |
Compare product options against task requirements
The following candidate options match this page's responsibilities. Compare them against the operating conditions described, then check capacity, materials and interfaces on the product pages. Card images show representative configurations; suitability must still be confirmed at actual operating points and by application results.
| Product category | Corresponding role | Confirm before selection |
|---|---|---|
| Custom sampling probe | Sampling interface between source container and fluidic path | Compare custom geometry by minimum liquid level, probe-tip clearance and actual sample |
| EA standard piston pump | Finite-stroke metering | Compare configurations by routine dose, total cycle displacement and wetted materials |
Check immersion, dispensing and internal and external probe washing
Confirm liquid level and position before aspiration. Dispense using the specified receiving action, then wash internally and externally. Recheck bottom clearance after vessel changes or maintenance; correct mechanical position alone does not exclude air aspiration.
Action records should link commands, valve or interface states and actual received results. When raw material, container or sample identity changes, reconfirm shared paths and conditions permitting the next step. Completion of drive movement alone does not replace task acceptance.
Measure low-volume delivery, retained droplets and carryover
Include normal and low-volume samples, measuring receipt, carryover and probe-tip droplets. Interpret blockage or leak alarms within the action window rather than monitoring motor position alone.
| Validation scenario | Measurement or observation | Interpretation and action |
|---|---|---|
| Minimum liquid level | Check actual sampling and detection of air aspiration | Handle affected actions according to sample identity |
| High/low sample switching | Check volume and contamination recovery separately | Distinguish internal probe residue from external droplets |
Record test medium, configuration, installed path and operating sequence; present routine operating points and boundary results separately. Calculations support design discussions, component documentation checks models, and installed measurements confirm the actual task.
After an abnormality or maintenance, first identify which segment needs recovery
Air aspiration, clots/particles, probe contact with a wall or leakage alter actual delivery. Stop the current action, confirm sample identity and resample or flag it according to the method.
Retain current source, container identity, completed actions, valve or interface state and actual receiving information. Use the table to locate the stage that changed before deciding to retry, continue or restart. After recovery, recheck the relevant operating point before returning an uncertain action to the automatic cycle.