Where multiple-reagent aspiration and dispensing occurs in the instrument
Bead suspensions, labels, buffers and substrates have different wetted-path and standby requirements. Manage resuspension, first doses, replenishment and cleaning separately; particulate reagents should not be treated as water.
Bead suspensions, binding reagents and substrates may have different settling, light and storage requirements. Plan standby, mixing and first-dose recovery by actual formulation, including residual liquid in shared tubing.
Product responsibilities in this operation
Syringe drive and valve positions jointly organize aspiration, holding and dispensing. Record working volume, remaining inventory and replenishment timing according to the sequence.
For this operation, confirm: Reagent formulation and source; bead suspension or soluble reagent; mixing and standby needs; syringe inventory; refill window; shared residue and receiving reaction vessel.
Organize the sequence by actual architecture
- Distinguish bead suspensions, labels, buffers and substrates, confirming wetted-path, standby and mixing conditions for each formulation.
- Check source valve position and usable inventory in syringe-metered branches; align priming destination and replenishment windows with the actual reaction sequence.
- Deliver the current reagent to its designated reaction vessel, checking actual first-dose, consecutive-dose and post-standby volumes separately. Coordinate reagents requiring resuspension with the appropriate mixing sequence.
- Clean or isolate source paths according to the assay, confirming that shared residue does not alter receipt of the next reagent or substrate.
Define operating conditions for this task
| To define | Details |
|---|---|
| Actual operating conditions | Reagent formulation and source; bead suspension or soluble reagent; mixing and standby needs; syringe inventory; refill window; shared residue and receiving reaction vessel |
| Acceptance target | Using each actual reagent formulation, measure first, middle and final doses at the reaction vessel, including after standby and replenishment. For suspensions, verify the required mixing state alongside delivered volume. |
| Fault localization | Settled particles, source depletion, air entry or retained droplets can change the dose or formulation. An apparently correct syringe inventory does not confirm that the intended reagent reached the designated vessel. |
Further technical reading
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 |
Validate operation results at the receiver
Using each actual reagent formulation, measure first, middle and final doses at the reaction vessel, including after standby and replenishment. For suspensions, verify the required mixing state alongside delivered volume.
Check that source changes and shared residue do not alter the next reagent or substrate addition. Relate the complete addition sequence to assay background and reaction results; a batch mean can hide a poor first or last dose.
Locate abnormalities and restore the next operation
Settled particles, source depletion, air entry or retained droplets can change the dose or formulation. An apparently correct syringe inventory does not confirm that the intended reagent reached the designated vessel.
Hold affected additions, reconcile source identity, remaining inventory and vessel delivery, then restore the reagent-specific mixing and priming conditions. Verify the first recovered dose and handle already dosed vessels without repeating completed additions.
Suspension mixing, metered delivery and magnetic solid-phase washing are distinct operations. Each reagent and complete assay require their own validation.