Foreach Dual-head valveless metering pump for concentrate dilution and proportional dosing. Concentrate-to-diluent volume ratio 1:9; shown configuration: 100 μL + 900 μL.
FOREACH DRPL-0109 is a dual-head ceramic-piston valveless metering pump for concentrate dilution, buffer preparation and proportional dosing at a concentrate-to-diluent volume ratio of 1:9. The shown configuration delivers 100 μL of concentrate and 900 μL of diluent, giving a nominal combined volume of 1 mL. It can be specified as a concentrate dilution pump or proportioning pump. Proportional delivery and downstream mixing are separate steps: check each path output, the ratio and the uniformity of the prepared liquid.
Typical Applications:
Automated analyzers: on-instrument concentrate dilution, Laboratory and reagent preparation: fixed-ratio buffer dilution, Reagent production: proportional batch dosing
| Concentrate-to-diluent volume ratio | 1:9 |
|---|---|
| Concentrate parts | 1 |
| Diluent parts | 9 |
| Concentrate volume (μL) | 100 |
| Diluent volume (μL) | 900 |
| Combined volume (mL) | 1 |
| Speed | 60–300 rpm |
| Minimum flow QMin (mL/min) | 60 |
| Maximum flow QMax (mL/min) | 300 |
| Reagent A working-fluid port | 1/4-28 UNF-2B |
| Reagent B working-fluid port | G1/8 (metal push-in fitting by default) |
| Reagent A wash-fluid port | 1/4-28 UNF-2B |
| Reagent B wash-fluid port | 1/4-28 UNF-2B |
| Reagent A pressure rating | Max 150 kPa |
| Reagent B pressure rating | Max 150 kPa |
| Dimensions (mm) | 180 × 83.7 × 75 mm |
| Weight | 1536 g |
| Accuracy | <2% |
| Repeatability | <0.5% |
| Service life | 20,000,000 cycles |
The ratio is concentrate volume to diluent volume. Verify both path outputs separately; total volume alone does not establish mixture concentration.
Proportional delivery is separate from mixing. Confirm wetted materials, working backpressure and performance conditions for each path.
Typical applications
DRPL-0109 addresses two-liquid preparation at a concentrate-to-diluent volume ratio of 1:9. It may be specified as a concentrate dilution pump, proportioning pump or dual-channel metering pump. 1:9 describes the volume relationship between the liquids, not a speed setting or a final volume of only 9 times the concentrate volume.
Automated analyzers: on-instrument concentrate dilution
One path draws concentrate and the other draws diluent; the outputs meet and mix before reaching the working-solution reservoir. For this task, DRPL-0109 may be specified as a concentrate dilution pump or reagent dilution pump. Proportional pumping supplies the liquids, while downstream mixing determines uniformity.
Ratio calculation: 1:9 means one part concentrate plus 9 parts diluent. Assuming additive volumes, no target solute in the diluent and no reaction, the combined volume is 10 times the concentrate volume and the target-solute concentration is 1/10 of its original value. The shown 100 μL + 900 μL configuration gives a nominal 1 mL. Confirm concentration from measured outputs and prepared-liquid testing.
Prime and remove air from both paths before assessing the liquid entering the mixer, especially after startup or liquid changes. A depleted supply or bubbles in one path can cause a concentration error even if combined volume appears acceptable. Measure each path independently before assessing the mixed working solution.
Laboratory and reagent preparation: fixed-ratio buffer dilution
In laboratory preparation equipment, a component combining concentrate and diluent may be specified as a buffer preparation pump or proportioning pump. Choose DRPL-0109 because the formulation requires a 1:9 volume ratio, not merely because the application uses the word buffer.
Calculation example: a nominal 100 mL batch at 1:9 requires 10 mL concentrate and 90 mL diluent. This is formulation arithmetic, not a batch-accuracy guarantee. Check the prepared liquid against the formulation requirements for ionic strength, acidity and dissolution state.
Correct proportions do not automatically ensure uniform mixing. Select the downstream junction, mixer and reservoir for batch volume, delivery timing and residence time. Test mixtures that may precipitate or foam. A ceramic piston does not establish compatibility of every component in both liquid paths.
Reagent production: proportional batch dosing
When two liquids enter a preparation vessel in a fixed relationship, DRPL-0109 may be described as a proportioning pump or dual-channel metering pump. Specify ratio, total batch volume and allowable preparation time. Filling the prepared liquid into individual bottles is a separate downstream task, not an integrated function implied by the dual-head pump.
Increasing or decreasing both path outputs by the same factor does not change their ratio. Overall speed adjustment therefore cannot turn a 1:9 configuration into 1:19. A different formulation requires reassessment of pump-head and displacement configuration. At batch startup and shutdown, consider path volumes, arrival times at the mixer and residual liquid.
The shown working-fluid ports are 1/4-28 UNF-2B for reagent A and G1/8 for reagent B; both wash-fluid ports are 1/4-28 UNF-2B. Confirm the A/B-to-liquid mapping from the configuration drawing rather than port size alone. Check the pressure and supply status of both paths separately.
Define the fluidic task and configuration
Provide both liquids, target volume ratio, batch volume or total flow, preparation time, both inlet conditions and backpressures, and the downstream mixing arrangement. Assess proportional delivery, instrument control and mixture uniformity separately; listed applications are selection directions, not universal validation claims.
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Frequently Asked Questions
It denotes concentrate-to-diluent volume ratio: one part plus 9 parts. With additive volumes, no target solute in the diluent and no reaction, the final volume is 10 parts and concentration is 1/10 of the concentrate value. Do not confuse liquid ratio with final dilution factor.
Confirm the DRPL-0109 configuration for your instrument
Provide both liquids, target volume ratio, batch volume or total flow, preparation time, both inlet conditions and backpressures, and the downstream mixing arrangement. Assess proportional delivery, instrument control and mixture uniformity separately; listed applications are selection directions, not universal validation claims.