Where operating-state switching occurs in the instrument
Record old-sample discharge, fresh sampling, washing, reaction-interface and maintenance-bypass states. Prevent old sample or wash liquid entering measurement, and confirm the validity of the first sample cycle after recovery.
Define old-sample discharge, fresh sampling, reaction and maintenance-bypass states clearly. After recovery, confirm sample renewal before marking the first measurement cycle as valid.
Product responsibilities in this operation
Valves control the current source or destination; the associated drive performs metering or transfer. Port connections, actual positioning and shared-segment renewal must match the operation.
For this online water-sampling task, define all ports, valve states, pressures in each state, shared volume and displacement volume.
Organize the sequence by actual architecture
- Create a connection-state table for old-sample discharge, fresh-sample intake, cleaning, the analytical interface and maintenance bypass. Define the current source and receiver.
- Switch valve paths only at permitted pump states and pressures. Check that old samples, wash liquid and maintenance drainage reach their specified destinations.
- Measure new-sample arrival and renewal, and check the first result against the monitoring method before marking measurements valid. Retain switching and restoration timestamps.
Define operating conditions for this task
| To define | Details |
|---|---|
| Actual operating conditions | All ports, valve states, pressures in each state, shared volume and flushing volume |
| Acceptance target | Check unintended connections, leakage, backflow and post-switching residue in each state; measure flushing volume and arrival delay through the complete path |
| Fault localization | Misalignment, shared-segment residue or abnormal switching pressure may affect the next task |
Compare product configurations by the roles on this page
| Product | Configuration option | Conditions to verify |
|---|---|---|
| MRV3 multiport rotary valve | Multiple-source selection | Compare 10-, 16- and 24-port options and port diagrams; verify high-pressure suitability separately |
Validate operation results at the receiver
Check unintended connections, leakage, backflow and post-switching residue in each state; measure flushing volume and arrival delay through the complete path.
Compare field and received samples for representativeness. Measure actual refresh and recovery after maintenance.
Locate abnormalities and restore the next operation
Misalignment, shared-segment residue or abnormal switching pressure may affect the next task.
Stop the pump, check port states and flush again after recovery.
Nominal volume divided by flow estimates transport time; it does not establish complete sample renewal or representativeness.