What do these products do in this instrument?
Valveless Metering Pumps: Repeated or Continuous Medium Supply in Suitable Configurations
Provide repeated or continuous output to replenishment branches where the actual formulation and backpressure permit. Coordinate the feed vessel and control sequence, and record bottle changes, priming, flow stops and cumulative volume.
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 and continuous medium supply | Discrete or continuous feeding mode, time profile, medium, load, cumulative volume and permissible interruption |
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 and continuous medium supply
Include bottle changes, priming and the first delivery after flow stops in the replenishment program. A short water test does not establish material compatibility or medium-delivery performance over an extended run.
Confirm product roles in actual operation
| Operation | Measurements and observations | Priority checks |
|---|---|---|
| Repeated and continuous medium supply | Measure pulse doses or flow over defined time windows separately, then reconcile cumulative material, bottle changes and restarts. | An empty source, bubbles, refill interruptions or repeated control states may alter actual feed delivery. |
Compare viability, recovery and cell condition before and after transfer, and validate the required contamination controls.
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.
Low shear and sterility are validation objectives for the complete flow path. Neither a diaphragm pump nor a pinch valve alone establishes them.