BRAND Transferpettor External Piston Pipette Model 701807

Overview

The BRAND Transferpettor External Piston Pipette Model 701807 is an ISO 8655-compliant, manually operated single-channel liquid handling instrument engineered for high-precision dispensing of challenging fluids where conventional air-cushion pipettes fail. Unlike standard positive-displacement pipettes that integrate the piston within the barrel, the 701807 employs a true external piston architecture: the piston assembly resides entirely outside the disposable tip and makes direct contact with the sample during aspiration and dispensing. This eliminates compressible air gaps and prevents vapor condensation, surface tension artifacts, or residual film formation—critical for reproducible transfer of volatile solvents (e.g., chloroform, acetone), viscous media (e.g., glycerol, polymer solutions), and dense liquids (e.g., mercury-based reagents, concentrated acids). Its design conforms to the metrological requirements defined in ISO 8655-2 (volumetric performance) and ISO 8655-5 (test methods), ensuring traceable calibration and long-term measurement integrity under routine laboratory conditions.

Key Features

• External piston mechanism enabling direct liquid-piston contact—no air cushion, no evaporation-induced volume drift
• Digital volume adjustment with tactile feedback and lockable setting for 2.5–10 µL range; resolution of 0.1 µL
• Borosilicate glass tip cap ensures chemical inertness and thermal stability across 15–40 °C ambient operation
• PTFE-coated piston seal provides low-friction movement, resistance to aggressive solvents, and minimal hysteresis over repeated cycles
• Ergonomic handle with balanced weight distribution and soft-grip surface reduces operator fatigue during extended use
• Calibration-friendly design: adjustable volume stop and service-accessible piston assembly support in-house verification per ISO 8655-5 protocols

Sample Compatibility & Compliance

The Model 701807 is validated for reliable handling of liquids exhibiting extreme physical properties: densities ≥13.6 g/cm³ (e.g., bromobenzene, diiodomethane), kinematic viscosities up to 50,000 mm²/s (e.g., silicone oils, molten polymers), and saturated vapor pressures up to 500 mbar at 20 °C (e.g., ethyl acetate, dichloromethane). It complies with ISO 8655-2 for accuracy and precision specifications and supports GLP and GMP workflows through documented calibration traceability, mechanical durability testing, and absence of memory effects between samples. While not electronically connected, its mechanical architecture meets the foundational requirements for audit readiness in regulated environments—particularly when paired with calibrated glass syringe standards and certified reference materials.

Software & Data Management

As a fully manual, non-electronic instrument, the Transferpettor 701807 does not incorporate onboard software or digital data logging. However, it is designed for seamless integration into electronic lab notebook (ELN) and LIMS ecosystems via standardized calibration records and user-maintained logbooks. Each unit ships with a factory-issued calibration certificate referencing NIST-traceable standards, and its mechanical repeatability (≤0.5% CV at nominal volume) enables consistent entry into digital workflow templates aligned with FDA 21 CFR Part 11 principles—provided operators follow defined SOPs for volume setting, tip selection, and post-use verification. Optional accessories include certified glass calibration syringes (e.g., BRAND 702802 series) and traceable volumetric standards compliant with ISO/IEC 17025-accredited laboratories.

Applications

This pipette is routinely deployed in analytical chemistry labs for quantitative dilution of heavy metal standards prior to ICP-MS analysis; in pharmaceutical QC for accurate dosing of high-boiling-point excipients in formulation development; in clinical diagnostics for reproducible transfer of serum-based ELISA substrates prone to foaming; and in food safety testing for precise spiking of pesticide standards in fatty matrices. Its ability to deliver full-volume discharge—including the final observable droplet—ensures quantitative recovery in gravimetric validation studies and supports method transfer across ISO/IEC 17025-accredited facilities. The glass tip cap also permits brief exposure to mild sterilization protocols (e.g., ethanol wipe + UV irradiation), extending utility in low-bioburden cell culture applications requiring solvent-compatible liquid handling.

FAQ

What distinguishes the Transferpettor 701807 from standard positive-displacement pipettes?

It features a mechanically isolated external piston that moves independently of the tip housing—eliminating internal dead volume and enabling complete, observable expulsion without blow-out pressure.
Can this pipette be calibrated in-house?

Yes. Its volume adjustment mechanism and piston travel are accessible for mechanical recalibration using certified gravimetric or photometric methods per ISO 8655-5 Annex B.
Is the glass tip cap autoclavable?

No. Borosilicate glass tips are chemically resistant but not designed for steam autoclaving; alternative sterilization includes ethanol immersion and UV-C exposure.
Does BRAND provide certified calibration services for this model?

Yes—BRAND-certified calibration is available through authorized service centers, including uncertainty reporting aligned with ISO/IEC 17025 requirements.
What tip types are compatible with Model 701807?

It requires BRAND-specific external-piston glass or polymer tips (e.g., catalog numbers 701812, 701817, 702802); standard conical pipette tips are incompatible due to sealing geometry.