FOREACH 250 μL Precision Piston Pump for Specialty Reagent Dispensing and Small-to-Medium-Volume Fluid Paths, with a PEEK Pump Head for Applications Requiring Material Compatibility and Light Protection
EA-250-PEEK is a 250 μL precision piston pump with a PEEK pump head for reagent dispensing in clinical chemistry analyzers, sample dilution in automated preparation systems and metered reaction-liquid addition. It supports 1/4-28 UNF or M6 ports and 2000 full-stroke steps. Accuracy and repeatability at 100% full stroke are both ≤0.5% under the specified test conditions.
The displayed PEEK pump head can be replaced by a project-matched PMMA or PCTG option. Piston choices include zirconia ceramic, alumina ceramic, PEEK and sapphire. Ports, motor, optical feedback, valves and controls can be configured to the instrument. All wetted materials must be assessed against reagent composition and operating conditions.
Typical Applications:
Reagent dosing, Sample dilution, Reagent metering and standard addition, Automated sampling and solution preparation
| Volume | 250 μL |
|---|---|
| Displayed pump head material | Polyether ether ketone (PEEK) |
| Pump head material options | PCTG / PMMA / PVDF / PPS / PEEK / POM; Other engineering materials can be assessed for the project. |
| Piston material options | Zirconia ceramic / alumina ceramic / polyether ether ketone (PEEK) / sapphire; the combination is assessed for fluid properties, service-life requirements, installation space and project needs. |
| Fluidic interface | 1/4-28 UNF / M6 |
| Stroke | 12.7 mm |
| Recommended max speed | 600 RPM |
| Motor step angle | 1.8° / 0.9° |
| Lead | 1.27 mm |
| Full-stroke steps | 2000 Step |
| Accuracy at 100% stroke | ≤0.5% |
| Repeatability at 100% stroke | ≤0.5% |
| Accuracy at 2% stroke | ≤2.0% |
| Repeatability at 2% stroke | ≤1.5% |
| Backlash | ≤1.0% |
| Designed life | 5 million cycles |
| Max fluid pressure | <0.30 MPa |
Typical applications of the 250 μL PEEK-head precision piston pump
EA supports metered liquid handling in clinical chemistry, immunoassay, laboratory automation, sample preparation and water or environmental analysis. Project configurations can also be assessed for life science and omics instruments, diagnostic reagent filling and industrial liquid dosing. Tasks include reagent addition, dilution, standard addition, buffer dispensing, reaction-liquid addition, solution preparation, metered washing and priming. Depending on its role, it may be described as a reagent, dilution, standard-addition, dispensing or reagent-filling pump. Titrant addition requires additional minimum-dose validation.
EA-250-PEEK focuses on reagent dispensing in clinical chemistry analyzers, sample dilution in automated preparation systems and metered reaction-liquid addition. The 250 μL capacity can be configured for small and intermediate sample or reagent volumes, matching the required dose to the available step control. The displayed PEEK head is a material option for specialty reagents. It does not establish compatibility of all wetted parts or light protection for the entire fluid path. The scenarios below connect instrument requirements with configurable capabilities; suitability is subject to application validation.
1. Reagent dispensing pumps for clinical chemistry and immunoassay analyzers
Clinical chemistry and immunoassay analyzers add defined reagent volumes to reaction units. A reagent dispensing pump must support consistent repeated doses and coordinated operation with selector valves, dispensing probes and instrument controls.
EA-250-PEEK: Specified full-stroke accuracy and repeatability are both ≤0.5% under the stated test conditions. Motor, home-position optical sensor and valve options support integration; small-dose performance must be verified using the actual reagent and working volume.
2. Sample dilution pumps for automated sample preparation
Sample-preparation instruments control sample and diluent volumes separately to achieve a programmed dilution ratio. A sample dilution or diluent dosing pump must coordinate repeated aspiration, dispensing, valve switching and between-sample washing.
EA-250-PEEK: 1/4-28 UNF or M6 ports connect to the instrument fluid path, with valves and a controller coordinating aspiration and dispensing. Pump full-stroke specifications are not a guarantee of dilution-ratio accuracy; working volumes, backlash compensation, residual liquid and mixing must also be assessed.
3. Reagent metering and standard-addition pumps for water analyzers
Water and environmental analyzers meter reagents, standards or diluents. A reagent metering or standard-addition pump must control dose volume while matching reagent composition, concentration and cleaning conditions.
EA-250-PEEK: Pump-head, piston and valve materials can be matched to the fluid. The EA specification includes an optional seal-wash arrangement for maintenance planning with crystallization-prone liquids. This option does not establish universal reagent compatibility or replace fluid and cycling tests. The displayed PEEK head is a material option for specialty reagents. It does not establish compatibility of all wetted parts or light protection for the entire fluid path.
4. Metered dispensing pumps for automated sampling and solution preparation
Automated sampling and solution-preparation equipment delivers reagents, diluents or buffers to selected containers. The dispensing pump must match the dose volume, sequence timing, valves and instrument controls.
EA-250-PEEK: EA supports motor, optical feedback and valve configuration. The specification lists an optional ISC1000 integrated driver with RS-232, RS-485 and CAN interfaces; these are driver capabilities, not interfaces built into the bare pump. Positioning and cycle time depend on the instrument motion system and fluid path.
Application selection guidance
250 μL is the nominal capacity; nominal volume per step is approximately 0.125 μL. Neither is a validated minimum dose. Provide working volume, allowed error, timing, reagent, temperature and back pressure for configuration-specific testing. The specification footnotes describe the 2% stroke figures as displacement tests, not direct measurements of reagent dispensing.
The specified expected life of five million cycles uses pure water at room temperature and 50 kPa back pressure. Saline or crystallization-prone fluids require a maintenance procedure. Pressure, seal wash, feedback and driver options follow the formal specification and project configuration. Omics, titration and filling require further carryover, minimum-dose, dripping or process validation.
Datasheet not yet available
The datasheet for this product has not been uploaded yet.
Frequently Asked Questions
This configuration targets reagent dispensing in clinical chemistry analyzers, sample dilution in automated preparation systems and metered reaction-liquid addition. The 250 μL capacity can be configured for small and intermediate sample or reagent volumes, matching the required dose to the available step control. Suitability depends on the fluid, working volume and instrument timing.
Piston Pump Configured for Your Instrument
Share the target volume, fluid compatibility, port type, control method, installation space, and service-life requirements. The FOREACH engineering team can help confirm the pump configuration and wetted materials.