Digital Titrator for Laboratory Use – Hach Model (Generic Digital Titrator Series)

Overview

The Hach Digital Titrator is a precision-engineered, motorized titration system designed for routine and regulatory-compliant water and wastewater analysis in laboratory and field-deployable settings. Unlike manual burettes or semi-automated systems, this instrument implements a calibrated syringe pump mechanism coupled with microprocessor-controlled dispensing logic to deliver highly reproducible titrant volumes with resolution down to 0.01 mL per step. It operates on the fundamental principle of volumetric titration—measuring the precise volume of standardized reagent required to reach an endpoint detected either visually (via colorimetric indicators) or instrumentally (when interfaced with compatible Hach colorimeters or photometers). Engineered for compliance with standard methods including EPA 365.3, ASTM D1072, and ISO 9297, the device supports both acid-base and redox titrations commonly applied in hardness, alkalinity, chlorine residual, and cyanide determinations.

Key Features

• Motor-driven, positive-displacement syringe pump with adjustable stroke volume and programmable dispensing rate
• Integrated LCD display showing real-time dispensed volume, titration step count, and cumulative total
• Pre-programmed method templates for common water quality parameters (e.g., Total Hardness, Phenolphthalein Alkalinity, Free Chlorine)
• Calibration traceability via NIST-traceable syringe volume verification procedures
• Ergonomic handheld or benchtop configuration with low-power consumption for extended battery operation
• Chemical-resistant PTFE and borosilicate glass fluid path components compatible with Hach titrant solutions (e.g., EDTA, sulfuric acid, sodium thiosulfate)
• IP54-rated enclosure suitable for humid laboratory environments and mobile field use

Sample Compatibility & Compliance

This digital titrator is validated for use with aqueous samples across pH 2–12 and turbidity levels ≤ 100 NTU. It interfaces seamlessly with Hach’s DR series spectrophotometers and colorimeters for endpoint detection in photometric titrations. All operational firmware and calibration logs comply with GLP data integrity requirements. The device supports audit trail functionality when connected to Hach’s Lab Software Suite (v5.2+), enabling full 21 CFR Part 11 compliance—including electronic signatures, user access controls, and immutable record retention—for regulated laboratories under US EPA, ISO/IEC 17025, or state-certified drinking water testing programs.

Software & Data Management

Data export is supported via USB 2.0 interface to standard CSV or Excel-compatible formats. When paired with Hach’s Laboratory Information Management System (LIMS) Connect Module, titration records—including operator ID, sample ID, date/time stamp, method version, and raw volume data—are automatically synchronized with enterprise LIMS platforms. Firmware updates are delivered through Hach’s secure Customer Portal and include version-controlled release notes, cybersecurity patches, and method validation documentation. All stored results retain metadata required for ISO 17025 clause 7.8.2 (recording of measurement uncertainty contributors).

Applications

• Determination of total and calcium hardness in drinking water per Standard Methods 2340 C
• Alkalinity profiling (P, M, and total) in wastewater influent and effluent streams
• Iodometric titration for dissolved oxygen (Winkler method) in environmental monitoring
• Residual chlorine quantification using DPD colorimetric endpoint detection
• Cyanide analysis via pyridine-barbituric acid method with automated titrant delivery
• Acid-neutralizing capacity (ANC) assessment in surface water acidification studies

FAQ

Is this device certified for use in EPA-approved drinking water laboratories?
Yes — when operated per Hach’s Method Validation Package (MVP-2023-DT) and maintained under documented calibration schedules, it meets the performance criteria outlined in EPA Contract Laboratory Program (CLP) guidelines for titrimetric methods.
Can the titrator be recalibrated in-house without sending it to service?
Yes — users may perform volume verification using certified volumetric glassware and NIST-traceable standards; full recalibration requires Hach-certified service tools and firmware authorization.
What titrant reservoir options are available?
Standard configurations support 10 mL and 25 mL glass syringes; optional 50 mL PFA-lined reservoirs are available for high-volume applications or aggressive reagents.
Does the unit support multi-point titration curves?
No — this is a fixed-endpoint volumetric titrator, not a potentiometric or pH-stat system; continuous curve generation requires Hach’s Titralab series or third-party compatible potentiostats.
Is training and method documentation included with purchase?
Yes — each unit ships with printed Quick Start Guide, full Method Manual (Hach Bulletin No. 10245), and access to on-demand video training modules via Hach University portal.