What do these products do in this instrument?
Tubing and fittings: maintain dispensing paths and delays
Connect sample or reagent sources to the metering and probe interfaces without losing the relationship between the programmed addition and arrival at the cuvette. Include any system-liquid segment and reused wash path when reviewing a change.
Tubing and fittings together form sealed connections and the actual transfer path. Check formulation, inner/outer diameters, length, tube-end positioning and port geometry, including added volume in residue and arrival delay.
Budget the path from metering unit to reaction contact
Identify the installed length, bore and interface volumes between the active source and the probe. A different connection can change liquid retained and renewed before the next addition. Keep the actual arrival event separate from motor or valve completion, and assess the effect of the proposed assembly with the method-defined addition and reading sequence.
Further technical reading
Check the first reaction after washing or replacement
The maintained path may be mechanically sound while retaining wash liquid or a different liquid column. Reprime to the intended destination and measure the next received dose and arrival time. Then evaluate the assay response to that first addition; clotting, chromogenic and immunoturbidimetric methods do not share one universal restart timing rule.
Translate actual branch conditions into configuration requirements
| Condition | To confirm |
|---|---|
| Assembly and contact | Specify sample, reagent or system-liquid contact, installed tube dimensions, mating-port geometry and seal arrangement. |
| Arrival relative to method | Define the probe/cuvette position, addition sequence and actual contact observation used to relate a connection change to assay timing. |
| Wash and service recovery | Include priming destination, residual wash liquid and first-dose observations in the release procedure after opening the path. |
| Operation | Specific operating conditions |
|---|---|
| Assay-specified sample delivery | Actual sample-contact or system-liquid path, installed tube and fitting volume, probe position and method-specific liquid-arrival sequence |
| Cleaning reused paths and recovering the first dose | Reused sections reached by washing, drain/prime destinations and the first dose through the cleaned path before a method-valid reaction |
Compare product configurations by the roles on this page
| Product | Configuration option | Conditions to verify |
|---|---|---|
| Tubing materials and dimensions | Connection paths and shared volume | Bore, length, load and actual formulation jointly determine materials and dimensions |
| Rigid-tubing fittings | Tube-end positioning and sealed connections | Check tube outer diameter, threads, seal structure and port-bottom geometry |
Related operations and architecture comparisons
Assay-specified sample delivery
Small sample doses require checks of tip droplets, cuvette-wall contact and the system-liquid interface. Measure at the actual reaction location to relate volume to results.
Cleaning reused paths and recovering the first dose
Residual wash fluid may alter the next formulation or carry contamination. Check internal flushing, external coverage and the first dose through the cleaned path, evaluating residue effects with the assay.
Confirm product roles in actual operation
| Operation | Measurements and observations | Priority checks |
|---|---|---|
| Assay-specified sample delivery | Compare received sample volume and observed arrival at the cuvette before and after the assembly change, using the assay addition sequence. | Extra held volume, trapped gas or a seating gap may change the transfer even when the valve and motor report the same timings. |
| Cleaning reused paths and recovering the first dose | Assess the first addition after washing or maintenance for volume, arrival and the assay effect of residual wash liquid. | Mechanical sealing alone cannot confirm restoration of the intended liquid composition or reaction timing. |
Accept the connection change with evidence at the reaction position: sealed assembly, delivered volume, arrival and the appropriate first-reaction result. Keep the method timing record distinct from component response time.
Can the original timing program be retained after changing tube length?
Retain it only if the assembled path still meets the required delivery and arrival sequence. Recheck the actual reaction position, including the first dose after washing; matching fittings or an unchanged pump command do not establish that result.
Pump or valve response time is not the reagent-contact or instrument measurement-start time.