What do these products do in this instrument?
Valveless Metering Pumps: Repeated Doses or Continuous Supply in Suitable Configurations
Provide repeated or continuous output to dispensing branches within permitted formulation and load conditions, coordinated with starts/stops and vessel timing. Check dose, flow within time windows and cumulative volume separately.
Compare RPL-series options for repeated metering or auxiliary continuous supply according to the task. Confirm individual dose, flow over the operating time window and cumulative volume separately. For proportioning, also compare the liquid actually arriving from each of the two paths.
Distinguish repeated dosing from continuous supply first
Compare valveless metering pumps for repeated dosing or auxiliary continuous supply in suitable configurations. Repeated dosing requires assessment of individual deliveries and liquid released after stopping; continuous tasks require time-window flow and cumulative volume. After converting the rotation program to a set volume, measure the actual received volume under the installed flow-path and load conditions.
Handle starts/stops, replenishment and two-stream merging separately
Starting, stopping and bottle changes affect actual arrival. Record initial liquid delivery, recovery delay and terminal drips. For two-stream proportioning, check each path's load and arrival time before checking the composition and mixing after the junction. A matching cumulative ratio does not replace composition validation during startup and within each operating time window.
Translate actual branch conditions into configuration requirements
| Condition | To confirm |
|---|---|
| Output requirements | Define individual dose or target flow, duration, cumulative volume and allowable interruptions. |
| Installed load | Specify medium, inlet conditions, outlet backpressure and downstream connections. |
| Start-stop behavior and proportioning | Measure initial, steady-state and restart output. For two-stream tasks, also check actual arrival and mixing results. |
| Operation | Specific operating conditions |
|---|---|
| Repeated dispensing | Dose, count, first and last doses, retained volume and recovery after replenishment |
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 |
Explore specific operating and validation tasks
Repeated dispensing
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.
Confirm product roles in actual operation
| Operation | Measurements and observations | Priority checks |
|---|---|---|
| Repeated dispensing | 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 | Empty sources, bubbles, nozzle droplets and backpressure changes affect first or last doses |
Include first, middle and last batch doses, recovery after bottle changes, and extended operation with the actual medium.
Can the same configuration be retained after changing the target dose or time window?
Validate starts/stops, operating increments and receiver-end drips under the new actual load. Measure repeated dispensing dose by dose; for continuous supply, measure output within operating time windows and cumulatively. Then determine whether the existing configuration and program still meet requirements.
Repeated dosing and continuous supply are different modes. Valveless metering also requires validation with the actual medium and operating conditions.