Place the component in the complete analytical fluid path
Sample, reagent or diluentSyringe and inlet valveHolding or loop volumeOutlet valve and lineVessel, loop or detector path
Draw the liquid path for prime, normal operation, wash, idle and recovery. Mark which liquid contacts each part and where volume, concentration, pressure or detector response will be accepted.
Select by operating duty rather than a family name
| Configuration | Best starting duty | Boundary to confirm |
|---|---|---|
| HLD rotary-valve channel | Sequential access to several sources or destinations | Port map, common-path volume and purge sequence |
| HMD solenoid-valve channel | Independent or parallel reagent paths | Per-channel syringe, valve timing and refill plan |
| Small versus large syringe | Working dose as a useful fraction of stroke | Small-dose performance and total auxiliary-volume budget |
Continue with the application task that matches the liquid movement
Each task guide uses a concrete liquid path, calculation, abnormal-condition table and receiving-position acceptance plan. Choose by what the instrument must accomplish, not by a broad market label.
Provide the inputs that change the configuration
| Input | Provide | Why it changes the design |
|---|---|---|
| Working volumes | Minimum, routine and maximum dose plus air gaps, overdraw and rinse | Determines usable capacity rather than nominal size alone |
| Sequence | Source order, valve state, dwell, dispense, refill and wash | Determines throughput and whether one syringe can serve the route |
| Acceptance | Received volume, concentration, first dose, carryover and recovery | Separates pump motion from complete-channel performance |
FOREACH can use these inputs to match the product configuration, wetted materials, interfaces and control arrangement. The instrument developer remains responsible for method limits, safety logic and qualification of the complete analyzer.
Verify the result after priming, idle time and a realistic fault
- Record the installed configuration and actual liquid, not only the component model.
- Measure steady operation and the first cycle after priming, planned idle and liquid replacement.
- Challenge the relevant abnormal condition: air entry, restriction, low level, blocked outlet or incomplete wash.
- Accept the result at the receiving vessel, detector or cleaned surface; retain the component-level signal for diagnosis.