DHS MD-8 Eight-Channel Automated Reagent Dispenser
| Brand | DHS |
|---|---|
| Origin | Tianjin, China |
| Model | MD-8 |
| Plate Capacity | 1 × 96-well plate |
| Dispensing Range | 5–5000 µL |
| Accuracy | ≤ ±3% at 10–20 µL |
| Throughput | 8 samples per cycle |
| Dimensions | 350 × 300 × 400 mm (W × H × D) |
Overview
The DHS MD-8 Eight-Channel Automated Reagent Dispenser is an engineered solution for high-precision, programmable bulk liquid dispensing in life science laboratories. Designed around positive-displacement peristaltic pumping technology synchronized with stepper motor control, the MD-8 delivers consistent volumetric delivery across eight parallel channels without cross-contamination. Unlike air-displacement pipettors, its peristaltic architecture eliminates reliance on tip-based aspiration—making it ideal for viscous, foaming, or volatile reagents commonly encountered in ELISA, coagulation assays, cell culture media preparation, and HTS-compatible assay setup. The system operates independently of consumable tips, reducing both operational cost and plastic waste while maintaining traceable, repeatable performance under GLP-aligned workflows.
Key Features
- Eight-channel parallel dispensing with independent channel calibration and real-time flow monitoring
- Modular, pre-calibrated dispensing cartridges: fine-bore (for 5–200 µL) and standard-bore (for 100 µL–5 mL) configurations, both autoclavable and field-replaceable
- Adjustable dispensing height (5–85 mm) accommodating 6-, 24-, 96-, and 384-well microplates, PCR plates, deep-well blocks, and tube racks with optional adapters
- 7-inch high-resolution capacitive touchscreen interface with intuitive icon-driven navigation and multilingual firmware support (English default)
- Programmable dispensing modes: full-plate, user-defined column selection, gradient dispensing, and staggered volume assignment per column
- Integrated post-dispense aspirate function to recover residual fluid from tubing, minimizing carryover and reagent waste
- Onboard vibration mixing module (orbital oscillation) for homogenization of wells immediately after dispensing
- Automated self-cleaning protocol with configurable rinse cycles using deionized water or ethanol-compatible solvents
Sample Compatibility & Compliance
The MD-8 supports a broad range of laboratory consumables—including ANSI/SLAS-compliant 96-well plates (flat-bottom, U/V-bottom, PCR), skirted and semi-skirted formats, as well as non-standard tubes when used with certified DHS accessory holders (e.g., coagulation tube adapter, part #0401301-3). All dispensing cartridges are manufactured to ISO 8573-1 Class 4 purity standards for fluid path integrity and undergo factory gravimetric calibration per ISO/IEC 17025 guidelines. The instrument’s firmware architecture supports audit trail generation, user-level access control, and electronic signature capability—enabling compliance with FDA 21 CFR Part 11 requirements when deployed in regulated environments. Routine verification protocols align with CLSI EP10-A3 and ASTM E2758-18 for automated liquid handler performance assessment.
Software & Data Management
The MD-8 runs embedded Linux-based firmware with local storage for up to 100 user-defined methods. Each method includes full parameter logging: dispense volume per channel/column, dwell time, aspiration speed, dispensing velocity, mixing duration, and cleaning cycle count. Methods can be exported via USB 2.0 as CSV or XML files for external validation or LIMS integration. Optional PC software (DHS LabLink v3.2) enables remote scheduling, batch method deployment, and QC report generation—including %CV calculations across replicate plates and deviation heatmaps. All data logs include timestamp, operator ID, and instrument serial number—supporting traceability in ISO 15189-accredited clinical labs and GMP-managed bioprocess development units.
Applications
- High-throughput assay setup for drug discovery pipelines (e.g., kinase inhibition, receptor binding)
- Standardized reagent loading in diagnostic ELISA and lateral flow test development
- Coagulation panel preparation (PT, aPTT, fibrinogen) using calibrated plasma dilution series
- Cell-based assay seeding support—dispensing conditioned media, transfection reagents, or inhibitors into multiwell arrays
- Genomic library normalization prior to NGS library prep or qPCR plate setup
- QC sample distribution in reference material certification workflows per ISO Guide 34
FAQ
Is the MD-8 compatible with third-party microplates and tubes?
Yes—the MD-8 accepts any ANSI/SLAS-dimensioned 96-well plate without modification. Tube compatibility requires DHS-certified adapters (e.g., coagulation tube holder, catalog #0401301-3), which maintain positional repeatability within ±0.15 mm.
Can dispensing accuracy be verified in-house?
Absolutely. The system includes built-in gravimetric verification mode compliant with ISO 8655-6. Users may perform routine checks using Class A volumetric flasks and analytical balances traceable to NIST standards.
Does the MD-8 support integration with robotic deck systems?
While the MD-8 operates as a standalone unit, its RS-232 and TTL I/O ports allow basic handshake signaling with external automation controllers. Full integration with robotic arms or LIS/LIMS requires custom middleware development via provided API documentation.
What maintenance is required for long-term precision?
Daily wipe-down of the carriage and plate stage; monthly inspection of peristaltic tubing tension and replacement every 6 months under continuous use. Cartridge recalibration is recommended annually or after 5000 dispensing cycles.
Are firmware updates available remotely?
Firmware upgrades are distributed via DHS Secure Portal and installed locally via USB drive. Each release includes version-controlled changelogs, cybersecurity patches, and regulatory alignment notes (e.g., updated 21 CFR Part 11 audit trail logic).
