Locate the task in the fluid path first
Arrows indicate task relationships, not that every component is connected in series in one tube. Check valve positions, pump wetted boundaries and operating states for each branch.
Assess recovery through the complete flow path using the actual formulation, temperature and contact duration. Composition before and after switching, delay and blanks also matter. In chromatography systems, select pumps and valves using the actual pressure in each operating state.
Common product roles and application guides
| Product category | Role in this instrument |
|---|---|
| Syringe pump | Discrete transfer of protein samples and buffers |
| Air-displacement pipetting pump | Disposable-tip protein sample preparation |
| Diaphragm pump | Auxiliary buffer supply and washing |
| Fluidic valves | Switching pressurized separation paths where required; selecting buffer and sample sources |
| Bubble and pressure detection | Detect supply and pressure anomalies in protein-processing branches |
| Tubing and fittings | All protein-contact surfaces in the flow path |
- Syringe pumps in protein and antibody processing
- Air-displacement pipetting pumps in protein and antibody processing
- Diaphragm pumps in protein and antibody processing
- Fluidic Valves for Protein and Antibody Handling
- Bubble and pressure detection in protein and antibody processing
- Tubing and Fittings for Protein and Antibody Handling
Operating requirements differ by step
| Stage | Task category | Operating conditions to define |
|---|---|---|
| Sample transfer: verify recovery as well as volume | Sampling conditions | Actual sample volume, remaining source volume, probe-tip height, aspiration/dispensing speed and system liquid |
| Buffer switching: determine when the new composition arrives | Valve-path requirements | All ports, valve states, pressures in each state, shared volume and flushing volume |
| Anomaly monitoring: interpret fluid signals with method results | Inputs for fault detection | Specific sensor configuration, location, liquid/tubing, sampling rate, threshold and time window |
Sample transfer: verify recovery as well as volume
Pass protein samples through the actual tubing and vessels and compare with reference handling. Water calibration assesses volume; protein recovery assesses materials and workflow. Record them separately.
Buffer switching: determine when the new composition arrives
Estimate displacement from the shared volume, then use a measurable signal to confirm stability. A multiport valve selects sources; suitability for a separation branch also depends on the pressure it experiences.
Anomaly monitoring: interpret fluid signals with method results
A pressure rise may indicate blockage, a formulation change or valve state; bubbles may affect detection. Use sensor information alongside fluid-path status and analytical signals to decide how to recover.
Explore configurations through product application guides
- Syringe pumps in protein and antibody processing
- Air-displacement pipetting pumps in protein and antibody processing
- Diaphragm pumps in protein and antibody processing
- Fluidic Valves for Protein and Antibody Handling
- Bubble and pressure detection in protein and antibody processing
- Tubing and Fittings for Protein and Antibody Handling
Validate the complete cycle through application results
Compare recovery and blanks before and after the complete path, and check the response after buffer switching.
| Step to validate | Measurements or observations | Priority troubleshooting checks |
|---|---|---|
| Sample transfer: verify recovery as well as volume | Measure delivered volume, protein recovery, aggregation or method response, and carryover between samples together. | Material adsorption, aggregation, hanging droplets or residue can reduce recovery even when delivered volume meets requirements. |
| Buffer switching: determine when the new composition arrives | Check unintended connections, leakage, backflow and post-switching residue in each state; measure flushing volume and arrival delay through the complete path | Misalignment, shared-segment residue or abnormal switching pressure may affect the next task |
| Anomaly monitoring: interpret fluid signals with method results | Measure fault detection, false alarms and end-to-end response separately; cover baseline changes with liquid, speed and operating conditions | Normal air segments, viscosity changes and sampling delays may be misclassified |
A material name alone does not establish low adsorption. Confirm sample preparation, loading and pressurized separation branches separately.
Common selection and recovery questions
Why test protein recovery after passing water-based volume calibration?
Water calibration assesses liquid volume. For actual proteins, compare recovery and method response after contact with the intended materials, all connections and vessels. Distinguish volume loss from changes in the target.
Can the next step begin immediately after the buffer valve switches?
The shared section still contains the previous composition. Use volume estimates and measurable signals to confirm arrival of the new composition, and check the pressure in the relevant branch.