What do these products do in this instrument?
Bubble and pressure sensing: distinguish air aspiration, bubbles and blockage
Acquire pressure or bubble information where the sample or supporting liquid actually passes. Keep aspiration, dilution and detection-supply observations distinct, including the detection architecture used by the instrument. The controller uses these records to investigate a fault; a pressure change alone does not diagnose a clot.
ABD provides bubble or liquid-state signals for defined tubing; PDM5 provides pressure information at a defined location. Configure module, position and action window separately; the controller associates affected samples or tasks.
Build baselines for the blood-sampling and reagent branches separately
The sampling branch should be evaluated with method-permitted whole blood, its mixing state and the interval before aspiration. Reagent and detection-supply branches have different media and loads. Establish observations for each actual pump and valve phase rather than carrying a water-only sampling baseline into blood handling or a metered-dilution rule into continuous supply.
Further technical reading
Connect the affected sample to channel recovery
An interruption before sample transfer is different from one after dilution or during detection. Preserve the sample identity, preparation stage and channel in use. Restore the fluid path, then check channel renewal and the method-required blank before deciding which sample result must be repeated or withheld under the analyzer procedure.
Translate actual branch conditions into configuration requirements
| Condition | To confirm |
|---|---|
| Blood aspiration | Include mixing state, remaining sample volume, probe position and elapsed handling time in the sampling baseline. |
| Channel supply | Identify the actual diluent, lysing reagent or method-required sheath branch and its operating phase; do not assume all counting channels use sheath flow. |
| Recovery evidence | Record sample identity, dilution stage, affected channel, renewal sequence and blank result alongside the pressure or bubble event. |
| Operation | Specific operating conditions |
|---|---|
| State identification | Actual whole-blood handling and channel architecture, sampling versus supply phases, liquid-specific baselines, sample/preparation identity and required channel recovery |
State identification
During aspiration, relate the trace to the mixed specimen and remaining source volume. If delivery changes, review probe position and air entry together with the pressure event before repeating the sample operation.
During detection supply, distinguish a transient valve transition from sustained loss of the required liquid condition. Use the specific channel sequence to establish the observation and recovery windows.
Include repeated specimens and routine cleaning in verification. A baseline that works for one specimen or a clean line may misclassify normal variation or miss a progressively restricted path.
After clearing an affected branch, inspect renewal and the channel blank before returning to sample measurement. Record which sample stages were completed so a restart does not silently reuse a partially processed preparation.
Compare product configurations by the roles on this page
| Product | Configuration option | Conditions to verify |
|---|---|---|
| ABD bubble-detection module | Bubble or liquid-state identification in defined tubing | Validate detection and false alarms for tubing material, dimensions, medium and action window |
| PDM5 pressure-detection module | Pressure-state monitoring at a defined fluidic location | Confirm range and wetted configuration by model; validate normal baseline and abnormalities separately |
Related operations and architecture comparisons
Whole-blood sampling and delivery
Sample condition may change between repeated aspirations. Compare containers with normal remaining sample volume, low remaining sample volume and particle risks, recording tip position and air-aspiration handling rather than testing only repeated water aspiration/dispensing.
Confirm product roles in actual operation
| Operation | Measurements and observations | Priority checks |
|---|---|---|
| State identification | Compare normal and challenged aspiration with representative permitted blood conditions, then exercise the relevant channel-supply faults. Record false alarms, missed events and recovery observations separately for each branch. | Air, source depletion, sample changes and a restriction may produce overlapping observations. Check the active path and sample state before assigning a cause or accepting a channel result. |
Verify that the alarm identifies a useful investigation window and that channel renewal restores the method-required conditions. Keep sample-delivery, dilution-ratio and detection-result checks as separate evidence.
Can one pressure threshold identify a blood clot?
A threshold may flag a departure from the established baseline. Its cause still depends on sample condition, probe and valve state, liquid level and the measured location; investigate these conditions before deciding the sample and channel response.
Metered dilution and sheath-fluid flow are different roles; sheath-fluid requirements depend on the detection architecture.