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Automatic Potentiometric Titrator

PRODUCT MODEL：HM-D1

【introduction】Standard automatic potentiometric titrator supporting four core titration modes (acid-base, redox, precipitation, and complexometric titrations). Equipped standard with three analytical electrodes (acid-base composite, redox, and composite silver) and a high-precision temperature sensor; complexometric electrode optional. Designed for standard chemical analysis and general laboratory quality control.

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Product details

HM Instruments automatic potentiometric titrator with burette, titration beaker, touch screen, and scalable conductivity and permanent stop titration

Six core advantages including intelligent operating system, double titration modes, expansion modules, audit trail, method management, and thermal printing

Five major application areas covering food safety, environmental monitoring, pharmaceutical cosmetics, petrochemical, and scientific research

High precision closed-loop stepper motor drive with titration repeatability within 0.2 percent and minimum addition volume of 0.1 microliter

Conventional titration mode for custom research and specialized titration mode for standard one-click content analysis

Powerful method and data management interface supporting custom formulas, material library, and local storage of 100,000 titration records

Complete data integrity compliance with three-level user permissions and audit trail conforming to GLP and GMP standards

Convenient data output and connectivity options featuring built-in thermal printer, USB port, and Ethernet interface on Android 10 platform

Multi-endpoint approach supporting acid-base, redox, precipitation, complexometric, conductivity, and permanent stop titrations

Precision integrated fluid system with quick-swap 10mL and 20mL burettes, chemical-resistant pipelines, and automatic cleaning

Modular function configuration, easy maintenance via USB, system reliability with power-off protection, and multi-language tutorial interface

Comprehensive technical parameters and specifications table for HM-D1, HM-D2, HM-D3, and HM-D4 automatic potentiometric titrators

Standard and optional accessories list including host, titration electrodes, burettes, filters, electrode stand, and connection tubes

Shandong Hengmei Electronic Technology Co., Ltd. corporate team and instrument manufacturing enterprise profile

Modern scientific analytical laboratory facilities, research environment, and testing specialists at Hengmei

Product Overview

The HM Instruments HM-D1 Automatic Potentiometric Titrator is an industry-oriented analytical titration workstation engineered to overcome routine volumetric measurement challenges across food safety inspection, municipal water analysis, pharmaceutical API manufacturing, and petrochemical product quality control. In industrial laboratories handling complex sample matrices, traditional manual titrations frequently suffer from operator color-blindness variation, subjective indicator endpoint interpretation, and slow analytical turnaround.

Equipped with a micro-dosing closed-loop stepping motor and high-stability electrochemical sensing circuitry, the HM-D1 replaces visual color changes with precise mathematical derivatives of potential, pH, and electrochemical signals. By monitoring electrode potential in real time and calculating first and second-order curve derivatives, the instrument locks analytical endpoints automatically with a repeatability of ≤0.2% and titration error ≤±1.5% conforming to JJG 814-2015 0.05 level standards, delivering rigorous analytical traceability under GLP, GMP, and ISO 17025 testing frameworks.

Key Application Features

Automated Endpoint Derivation: Eliminates human optical error by computing first and second mathematical derivatives of electrochemical potential curves, enabling accurate endpoint detection even in turbid, opaque, or deeply colored sample solutions.
Micro-Volume Precision Dosing: Closed-loop stepper motor drive delivers minimum additions down to 0.0001 mL (0.1 μL), minimizing titrant consumption and maximizing analytical precision for low-concentration active ingredients.
Robust Chemical Compatibility: Precision valve-burette system features interchangeable 10 mL and 20 mL burettes connected via chemically inert PTFE Teflon pipelines and PEEK compression fittings resistant to harsh acids, strong oxidants, and organic solvents.
Specialized One-Touch Testing Library: Allows laboratory analysts to recall pre-configured testing protocols conforming directly to international and national standards (AOAC, ISO, GB, Pharmacopoeia) with automated sample result calculations.
Complete Analytical Data Integrity: Integrated Android 10 system enforces three-level operator permission controls, immutable audit trails, and encrypted local storage for up to 100,000 titration records with full raw titration curves.
Laboratory Connectivity and Instant Reporting: Built-in thermal printer produces instant audit receipts, while dual USB interfaces, Ethernet RJ45, and Wi-Fi allow immediate export of PDF reports and Excel workbooks to laboratory LIMS systems.
Contamination-Free Automated Maintenance: Dedicated automated purge, rinse, and drain cycles cleanse fluidic circuits between incompatible sample matrices, protecting operators and maintaining analytical uptime.

Industry Applications and Testing Items

The HM-D1 provides specialized analytical solutions across diverse industrial sample matrices:

Food Processing and Edible Oils: Rapid determination of acid value (AV) and peroxide value (POV) in edible vegetable oils, free fatty acids in frying fats, total acidity in fermented dairy, and amino acid nitrogen in soy sauce and vinegar.
Environmental Protection and Water Monitoring: Precision measurement of chemical oxygen demand (COD) permanganate index, chloride ion concentrations in saline effluent via silver nitrate precipitation, and ammonia nitrogen levels.
Pharmaceutical Synthesis and Cosmetics: Assay determination of active pharmaceutical ingredients (APIs), non-aqueous titrations in glacial acetic acid, pH and conductivity buffer verification, and swab cleaning validation in GMP cleanrooms.
Petroleum Refining and Lubricants: Total acid number (TAN) and total base number (TBN) in engine lubricants and transformer oils, mercaptan sulfur content in petroleum distillates, and purity verification of petrochemical reagents.
Industrial Electroplating and Chemical Synthesis: Bath acidity and free acid/metal ion control in metal finishing operations and concentration monitoring of chemical production streams.

Technical Specifications

Parameter Category	Technical Specification
Titration Analysis Repeatability	≤ 0.2%
Titration Analysis Error	≤ ±1.5% (JJG 814-2015 0.05 Level)
Burette Drive Resolution	Closed-loop stepper motor, resolution ≥ 1/1,500,000 (reliable resolution ≥ 1/300,000)
Minimum Addition Volume	Software controllable, minimum 0.0001 mL (0.1 μL)
10 mL Burette Capacity Tolerance	±25 μL
20 mL Burette Capacity Tolerance	±35 μL
Potential Measurement Range	-2000 ~ +2000 mV, Resolution: 0.1 mV, Electric Unit Error: ±0.03% FS
pH Measurement Range	-20.000 ~ +20.000 pH, Resolution: 0.001 pH, Basic Error: ±0.003 pH
Temperature Measurement Range	-5 ~ 105 °C, Resolution: 0.1 °C, Basic Error: ±0.2 °C
Operating System	Android 10 with multi-language GUI support (English, Chinese)
Display Screen	7-inch color capacitive touchscreen
Data Storage Capacity	100,000 titration records with complete volumetric curves
Communication Interfaces	USB Host/Device, Ethernet RJ45, Wi-Fi
Data Export Formats	PDF report and Excel spreadsheet dual-format export
Integrated Printer	Built-in thermal line printer
Electrical Power Supply	AC 110 ~ 240 V, 50 ~ 60 Hz universal input
Operating Environment	Temperature: 0 ~ 40 °C; Humidity: 10% ~ 75% RH
Instrument Dimensions (W × D × H)	310 mm × 226 mm × 233 mm
Host Net Weight	Approximately 3.7 kg

Standard Configuration and Optional Accessories

Each HM-D1 instrument is supplied with a comprehensive operational hardware package:

HM-D1 Analytical Titrator Host with integrated 7-inch touchscreen and Android 10 OS (1 unit)
Standard Analytical Electrodes: Acid-base composite electrode, Redox electrode, Composite silver electrode, Temperature sensor
Optional Electrodes: Complexometric titration electrode (optional upon request)
Quick-Swap Titration Burettes: 10 mL and 20 mL precision glass burettes (1 each)
Protective Fluidic Hardware: Visual inline filters (2 sets) and Titration tube outer protective sleeve (1 piece)
Electrode Stand Assembly: Five-hole multi-probe positioner (1 set) and Stainless steel vertical mounting rod (1 piece)
Fluidic Transfer Lines: Chemical-resistant PTFE Teflon tubing (1.5 m) and Protective PVC sleeve (1.5 m)
Fluidic Connections: Quick-disconnect PEEK threaded fittings (6 sets)
Analytical Sample Vessels: 100 mL chemical-resistant polypropylene titration cups (5 pieces)
Stirring Elements: PTFE encapsulated magnetic stirring bars (30 mm and 40 mm, 1 each)
Reagent Delivery Bottle: 500 mL light-shielded amber glass reservoir with dual-hole cap assembly (1 set)
Power and Compliance Documents: Universal power cord (1 piece), Certificate of conformity, warranty card, and user manual (1 set)

Model Selection Guide

Choose the optimal HM Instruments automatic titrator model based on specific laboratory analytical requirements:

Model	Core Analytical Capabilities	Standard Analytical Electrodes	Recommended Application Scope
HM-D1	Acid-base, Redox, Precipitation, Complexometric	pH composite, Redox ORP, Ag precipitation, Temp	Food acidity, vegetable oil AV/POV, water chloride, routine lab assays
HM-D2	Acid-base, Redox, Precipitation, Conductometric	pH composite, Redox ORP, Ag precipitation, Conductivity, Temp	Ultra-weak acids/bases, mixed electrolyte solutions, low-conductivity samples
HM-D3	Acid-base, Redox, Precipitation, Permanent-Stop (Dead-Stop)	pH composite, Redox ORP, Ag precipitation, Dual-Pt Dead-Stop, Temp	Pharmaceutical iodometry, sodium nitrite assays, diazotization reactions
HM-D4	Acid-base, Redox, Precipitation, Conductivity, Dead-Stop	pH, Redox, Ag, Conductivity, Dual-Pt Dead-Stop, Temp (5 electrodes)	Comprehensive testing centers requiring all analytical titration methodologies

Analytical Method and Workflow Support

The HM-D1 streamlines complex analytical protocols through structured digital workflows:

Method Standardization: Establish calibrated testing routines specifying titrant concentration, pre-stirring intervals, dynamic addition step ranges, and minimum derivative threshold for automatic endpoint detection.
Electrode Calibration: Standardize pH electrodes using multi-point buffer routines with automated slope calculation and temperature compensation across -5 °C to 105 °C.
Real-Time Dynamic Monitoring: Observe real-time curve progression on the 7-inch display, allowing immediate visual confirmation of chemical reaction equilibrium and multi-peak potential transitions.
Automated Data Archiving: Direct output of sample concentration, titration volume, consumption statistics, and audit metadata to encrypted internal memory or connected LIMS databases.
Preventive Maintenance: Execute automated cleaning cycles after each test series to preserve burette piston accuracy and prevent cross-contamination.