VWR Jencons Digital Bottle-Top Titrator
| Brand | VWR |
|---|---|
| Origin | Germany |
| Model | 613-3874 |
| Volume Range | 30 mL |
| Incremental Division | 0.01 mL |
| Coefficient of Variation (CV) | ≤0.01% |
| Compatibility | GL38, GL40, GL45 bottle necks |
| Chemical Resistance | High (PP, PTFE, FEP, ETFE wetted materials) |
| Display | Backlit LCD with real-time volume and operation status |
Overview
The VWR Jencons Digital Bottle-Top Titrator is an electronically controlled, precision liquid dispensing instrument engineered for high-accuracy titration workflows in analytical, quality control, and research laboratories. Designed on the legacy platform of Jencons—acquired by VWR International in 2008—the device integrates robust mechanical architecture with digital volumetric control to replace manual burettes and analog dispensers. It operates on a positive-displacement piston principle, ensuring consistent delivery independent of operator technique, liquid viscosity, or ambient temperature fluctuations. Unlike gravity-fed dispensers, this titrator employs a motor-driven, calibrated syringe mechanism coupled with optical encoder feedback for closed-loop volume verification. Its primary application domain includes standardized acid–base, redox, complexometric, and precipitation titrations compliant with ISO 8655-3 (piston-operated volumetric apparatus) and ASTM E2792 (standard practice for calibration of automatic titrators). The unit is intended for benchtop use in ISO/IEC 17025-accredited labs where traceability, repeatability, and audit-ready documentation are mandatory.
Key Features
- Digital volumetric control with adjustable dispensing increments down to 0.01 mL, enabling precise endpoint detection in low-volume titrations
- Backlit LCD display showing real-time dispensed volume, remaining capacity, battery status, and error codes for immediate troubleshooting
- High reproducibility: coefficient of variation (CV) ≤ 0.01% across full 30 mL range, verified per ISO 8655-6 protocols
- Chemically inert fluid path constructed from polypropylene (body), PTFE (seals), FEP (tube), and ETFE (valve components), ensuring compatibility with aggressive solvents including concentrated acids, bases, and organic media
- Universal bottle-neck adaptability via interchangeable collars supporting GL38, GL40, and GL45 thread standards—eliminating need for multiple dedicated dispensers
- Integrated battery-powered operation (rechargeable Li-ion) with >1,000 full-range cycles per charge and auto-sleep mode to extend service life
- Ergonomic, low-force dispensing trigger and anti-drip valve design minimize user fatigue and prevent carryover contamination
Sample Compatibility & Compliance
The VWR Jencons Digital Bottle-Top Titrator accommodates aqueous, alcoholic, chlorinated, and polar aprotic solutions without performance degradation. Its wetted materials meet USP Class VI biocompatibility requirements and comply with EU Regulation (EC) No. 1935/2004 for food-contact safety. Device calibration is traceable to NIST-certified reference standards, and routine verification follows ISO/IEC 17025 clause 6.4.3 for measurement equipment management. For regulated environments—including pharmaceutical QC labs operating under FDA 21 CFR Part 11—the titrator supports optional audit-trail-enabled firmware (via companion software interface) to record user ID, timestamp, volume setpoint, actual dispense value, and system diagnostics.
Software & Data Management
While the standalone unit functions without external software, optional connectivity via USB-C enables integration with VWR’s LabLink™ Desktop Suite (v3.2+). This platform provides electronic logbook functionality, automated calibration report generation (including uncertainty budgets per GUM), and CSV export compatible with LIMS systems such as LabWare LIMS and Thermo Fisher SampleManager. All data entries include digital signatures, tamper-evident timestamps, and version-controlled configuration files—supporting ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) for GLP/GMP compliance.
Applications
- Standardized titrimetric assays in environmental testing (e.g., COD, alkalinity, chloride per APHA 2320B)
- Pharmaceutical raw material assay and dissolution testing per USP and
- Food and beverage quality assurance, including titratable acidity (TA) and SO₂ determination
- Electroplating bath analysis requiring sub-milliliter reagent addition accuracy
- Academic teaching labs performing quantitative analysis experiments with documented procedural fidelity
- In-process control during fine chemical synthesis where stoichiometric reagent dosing directly impacts yield and impurity profile
FAQ
Is the 613-3874 model suitable for use with hydrofluoric acid (HF)?
No. Although the fluid path resists most common laboratory solvents, HF attacks both PTFE and glass-reinforced polymers; use only with HF-compatible accessories specified in VWR Technical Bulletin TB-771.
Can the device be recalibrated in-house?
Yes—using certified Class A volumetric flasks and distilled water at 20 °C, following the step-by-step procedure in the ISO 8655-compliant calibration guide included with firmware v2.4.
Does it support GL45 bottles with non-standard shoulder geometry?
Yes—the adjustable collar assembly includes spring-loaded tension compensation to accommodate minor dimensional variances in molded glassware.
What is the maximum allowable vapor pressure for volatile solvents?
Operation is validated up to 100 kPa absolute vapor pressure at 25 °C; for higher volatility (e.g., diethyl ether), pre-chilling the reservoir and reducing dispensing speed is recommended.
Is firmware update capability available via USB only?
Yes—updates require VWR-signed .bin files and must be performed using the official LabLink™ Utility; no OTA or cloud-based update pathway is implemented for security and regulatory integrity.
