Where repeated dispensing fits in the instrument
Compare finite-stroke metering and suitable RPL/DRPL configurations by dose, total cycle volume and refill interval. Evaluate first and last doses, restart after stopping and output at actual backpressure separately.
Compare cycle volume with usable capacity to calculate refill frequency and lost time. Evaluate valveless candidates by displacement per revolution, speed and actual output after starts and stops.
Product responsibilities in this operation
The valveless metering drive delivers liquid under the actual start-stop or continuous program. Nozzle geometry, backpressure and source conditions jointly affect what reaches the destination.
For repeated reagent dispensing, confirm dose, count, first and last doses, retained volume and recovery after replenishment.
Organize the sequence by actual architecture
- Define dose volume, batch count, receiving vessels and permissible pauses for the actual reagent. When comparing finite-stroke replenishment with repeated valveless metering, record each option's capacity or output conditions separately.
- For the valveless configuration, establish output from actual displacement, speed and start/stop programs. Prime from source to dispensing nozzle, and check actual backpressure and outlet condition.
- Deliver each dose to its designated vessel. Compare startup, middle and final doses while checking post-stop droplets and vessel-change timing.
- After bottle changes, standby or low-liquid faults, restore a properly filled path and verify the first dose. Record confirmed delivery to affected vessels so repeated commands do not cause duplicate dispensing.
Define operating conditions for this task
| To define | Details |
|---|---|
| Actual operating conditions | Dose, count, first and last doses, retained volume and recovery after replenishment |
| Acceptance target | Use actual media to check first, middle and last doses and delivery after bottle changes; confirm received volume and timing rather than substituting commanded steps for volume |
| Fault localization | Empty sources, bubbles, nozzle droplets and backpressure changes affect first or last doses |
Compare product configurations by the roles on this page
| Product | Configuration option | Conditions to verify |
|---|---|---|
| RPL Valveless Metering Pump | Suitable repeated or continuous metering | Compare displacement, speed, actual backpressure and starts/stops; check two-stream ratios separately |
Validate operation results at the receiver
Use actual media to check first, middle and last doses and delivery after bottle changes; confirm received volume and timing, not commanded steps as a proxy for volume.
Include first, middle and last batch doses, recovery after bottle changes, and extended operation with the actual medium.
Locate abnormalities and restore the next operation
Empty sources, bubbles, nozzle droplets and backpressure changes may affect first or last doses.
Stop affected steps, validate recovery after priming and avoid duplicate dispensing.
Repeated dosing and continuous supply are different modes. Valveless metering also requires validation with the actual medium and operating conditions.