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.
Calculate sample budget and minimum usable source volume
Budget working sample volume, path renewal, retained liquid and minimum usable volume in the vessel. For limited samples, reduce unnecessary discard first, then confirm adequate renewal in the actual valve path. Smaller tubing should not compromise installation or maintenance.
| Condition to compare | Information required | Selection affected |
|---|---|---|
| Sample-volume budget | Initial available volume, inaccessible bottom volume and repeated sampling | Determine available sample count and minimum liquid level |
| Inlet condition | Needle or tubing opening height, viscosity and particles | Define aspiration speed and handling of air aspiration |
| Receiving action | Hold time, dispensing speed and tubing volume | Define transfer order and path clearing |
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 |
|---|---|---|
| HLD rotary-valve syringe pump | Aspiration, holding and dispensing with a rotary valve | Check source/outlet valve positions, capacity budget and replenishment timing |
| Custom sampling probe | Sampling interface between source container and fluidic path | Compare custom geometry by minimum liquid level, probe-tip clearance and actual sample |
Manage wall contact, aspiration of air and resampling states
Confirm sample identity and valve position before aspiration, then deliver to the receiving vessel. Flag samples affected by wall contact, air aspiration or particles. Determine how far the previous action completed before resampling.
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.
Compare low-volume delivery and sample representativeness
Measure received volume and carryover between samples, comparing normal and low remaining volumes. Where particle or analyte representativeness matters, also use method-related results to check changes before and after transfer.
| Validation scenario | Measurement or observation | Interpretation and action |
|---|---|---|
| Source representativeness | Compare sample condition before and after sampling | Consistent volume still requires checking whether target components change |
| Minimum remaining volume | Measure actual receipt at the lower end of the usable range | Use sample identity to determine resampling after an inlet fault |
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.