Hirschmann EM Digital Bottle Top Dispenser

Overview

The Hirschmann EM Digital Bottle Top Dispenser is a precision-engineered manual liquid handling instrument designed for accurate, repeatable, and contamination-free dispensing of reagents, solvents, acids, bases, and other laboratory liquids directly from standard reagent bottles (e.g., GL45, GL32, GL25 necks). Based on the proven piston-driven positive displacement principle, the EM series eliminates reliance on gravity or air displacement—ensuring consistent volumetric delivery regardless of liquid viscosity, volatility, or vapor pressure. Its all-PTFE and ETFE wetted path provides broad chemical resistance, supporting safe handling of organic solvents (e.g., acetone, chloroform), aqueous solutions, and mild corrosives (e.g., dilute HCl, NaOH). Designed and manufactured in Germany to stringent DIN/ISO quality standards, the EM dispenser delivers metrological reliability suitable for routine QC testing, analytical sample preparation, and teaching laboratories operating under GLP-aligned workflows.

Key Features

• Digital volume display with tactile rotary dial for intuitive, parallax-free setting of dispensing volumes between 2.00 and 10.00 mL in 0.25 mL increments
• Positive displacement piston mechanism with PTFE-coated stainless steel plunger and chemically inert ETFE/PTFE seals—minimizing carryover and enabling rapid cleaning via simple water or solvent flush
• Universal bottle adapter system compatible with GL45, GL32, and GL25 threaded necks without requiring dedicated adapters or tools
• Integrated safety valve and vented reservoir cap prevent over-pressurization during priming and eliminate solvent vapor buildup
• Ergonomic, low-profile housing with non-slip grip and balanced weight distribution reduces operator fatigue during high-frequency use
• Calibration traceable to national standards; certificate of conformity supplied with each unit per ISO/IEC 17025-accredited procedures

Sample Compatibility & Compliance

The EM dispenser accommodates a wide range of common laboratory liquids—including polar and non-polar solvents, buffered saline solutions, ethanol/water mixtures, and diluted mineral acids (up to 30% v/v HNO₃ or H₂SO₄). It is not recommended for hydrofluoric acid, strong oxidizers (e.g., concentrated H₂O₂ >30%), or highly viscous media (>500 mPa·s at 20°C). All materials contacting liquid meet USP Class VI biocompatibility requirements and comply with EU Regulation (EC) No 1935/2004 for food-contact safety. The device conforms to ISO 8536-4 (infusion equipment) and ISO 8655-3 (piston-operated burettes), supporting audit readiness for ISO/IEC 17025, CLIA, and GMP-regulated environments. Its mechanical calibration stability meets the repeatability criterion of ≤0.1% RSD (n=10) and accuracy tolerance of ±0.6% across the full 2–10 mL range per ISO 8655-3 Annex B test protocol.

Software & Data Management

As a fully manual, non-electronic dispensing device, the EM requires no firmware, drivers, or software integration. However, its digital readout supports direct transcription into electronic lab notebooks (ELNs) and LIMS platforms. Volume settings are mechanically locked during operation to prevent accidental adjustment, and the dial position remains stable through repeated use—enabling unambiguous documentation of dispense parameters for traceability. For laboratories implementing 21 CFR Part 11 compliance, the EM may be included in instrument qualification protocols (IQ/OQ/PQ) as a fixed-parameter, non-configurable device; its calibration records, usage logs, and maintenance history satisfy GLP documentation requirements without requiring electronic audit trails.

Applications

• Precise reagent addition in titration and colorimetric assays (e.g., COD, BOD, pH buffer preparation)
• Standard solution dilution and serial preparation in analytical chemistry workflows
• Solvent transfer in HPLC mobile phase preparation and TLC solvent mixing
• Controlled dispensing of hazardous or volatile substances in fume hoods—reducing exposure risk compared to graduated cylinders or pipettes
• Teaching labs requiring robust, intuitive tools for introducing volumetric technique fundamentals
• QC labs performing routine checks of raw material purity or concentration consistency

FAQ

Is the EM dispenser suitable for dispensing hydrochloric acid?
Yes—diluted aqueous HCl solutions up to 10% w/w are fully compatible due to the PTFE/ETFE fluid path. Concentrated HCl (>37%) is not recommended owing to potential seal degradation over extended exposure.
Can I calibrate the EM dispenser in-house?
Yes—calibration can be performed gravimetrically using certified weights and distilled water at 20°C, following ISO 8655-3 procedures. Hirschmann provides detailed calibration guidelines and uncertainty budget templates upon request.
Does the EM require periodic maintenance beyond cleaning?
No scheduled maintenance is required. Routine cleaning with deionized water or compatible solvent after each use ensures long-term performance. Seal replacement is only necessary after ≥50,000 cycles or if leakage is observed.
What bottle thread sizes does the universal adapter support?
The integrated adapter fits GL45 (standard 45 mm), GL32 (32 mm), and GL25 (25 mm) bottle necks without additional parts or tools—eliminating cross-threading risk and reducing inventory complexity.
Is the digital display backlighted or battery-powered?
No—the display is purely mechanical and optical, with no electronics, batteries, or power source. Readability relies on ambient light and high-contrast engraved numerals, ensuring zero drift and infinite operational lifetime.