What do these products do in this instrument?
Syringe pumps: reagent preparation and aspiration/dispensing metering
Aspirate and dispense reagents as required in syringe architectures, coordinated with source selection and replenishment. Capacity and action cycles support the specific method's addition order and permitted window.
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.
Further technical reading
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 |
|---|---|
| Reagent arrival and reaction timing | Working volume, addition order, liquid-arrival delay, mixing wait and detection trigger |
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
Reagent arrival and reaction timing
Measure dispensing delay and its variability before relating control events to detection timing. Recheck the delay after changing tubing length or probes.
Confirm product roles in actual operation
| Operation | Measurements and observations | Priority checks |
|---|---|---|
| Reagent arrival and reaction timing | Measure volume, actual arrival time and complete-reaction results together | Mismatch between liquid arrival and control trigger, residual droplets or inadequate mixing may alter reaction initiation |
Measure actual delivery and trigger timing at the reaction site and assess the effect of post-wash residue on the assay.
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.
Pump or valve response time is not the reagent-contact or instrument measurement-start time.