What do these products do in this instrument?
Syringe pumps: discrete protein-sample and buffer transfer
Meter and transfer protein samples or buffers in suitable fixed paths. Coordinate vessels, valve paths and actual wetted surfaces, and check volume and target recovery separately.
HLD and HMD organize aspiration/dispensing paths with rotary and solenoid valves respectively. Capacity budgets include useful volume, holding stages and replenishment points; valve states and pump actions together create each delivery.
Organize syringe metering around aspiration, holding and dispensing
Syringe drives use controlled displacement for aspiration, holding and dispensing. With direct contact, source liquid enters the metering chamber; with system-liquid drive, sample can remain at the probe tip or a designated tube segment. Define wetted coverage before capacity, cleaning and replenishment. For repeated dispensing, track current inventory, delivered volume and next replenishment time.
Map valve connections to every action
Check port connections, opening/closing sequence and power-off state separately for rotary- and solenoid-valve configurations. Changing source does not automatically remove old liquid from the chamber or shared tubing. Plan flushing for formulation and residue requirements, then evaluate the first dose after switching and dose-to-dose variation.
Translate actual branch conditions into configuration requirements
| Condition | To confirm |
|---|---|
| Stored volume and timing | Define volume per operation, consecutive dispensing count, holding time and permitted replenishment window. |
| Valve positions and destinations | Provide a source, receiver and waste port diagram with open/closed and power-off states. |
| Liquid changes and first dose | Check shared residue, priming destination and actual received volume after standby or source changes. |
| Operation | Specific operating conditions |
|---|---|
| Sample transfer | Actual sample volume, remaining source volume, probe-tip height, aspiration/dispensing speed and system liquid |
Compare product configurations by the roles on this page
| Product | Configuration option | Conditions to verify |
|---|---|---|
| HLD rotary-valve syringe pump | Aspiration, holding and dispensing with a rotary valve | Check source/outlet valve positions, capacity budget and replenishment timing |
| HMD solenoid-valve syringe pump | Metered aspiration and dispensing with solenoid valves | Check open/closed and power-off states, working volume and replenishment cycle |
Explore specific operating and validation tasks
Sample transfer
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.
Confirm product roles in actual operation
| Operation | Measurements and observations | Priority checks |
|---|---|---|
| Sample transfer | 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. |
Compare recovery and blanks before and after the complete path, and check the response after buffer switching.
For repeated dispensing from one chamber, is checking total volume enough?
Measure each received dose, especially the first and last. Even when total volume is near target, individual errors may differ. Relate replenishment, valve switching and receiving actions to each result.
A material name alone does not establish low adsorption. Confirm sample preparation, loading and pressurized separation branches separately.