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Automatic Potentiometric Titrator with Conductivity and Dead-Stop Modules

Product Number：

HM-D4

Product Difference：

Flagship multi-module titration workstation integrating potentiometric titration, conductivity titration (0.00 uS/cm to 2000 mS/cm), and permanent-stop (dead-stop) titration. Equipped standard with five analytical electrodes and a temperature sensor, delivering comprehensive analytical coverage from ultra-weak electrolytes to pharmaceutical iodometry.

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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-D4 Automatic Potentiometric Titrator with Conductivity and Dead-Stop Modules is an advanced benchtop analytical instrument designed for precise and automated quantitative chemical analysis across research institutions, industrial quality assurance laboratories, and regulated manufacturing testing centers. Built upon a high-precision closed-loop stepping motor fluidic drive and intelligent signal acquisition electronics, the HM-D4 monitors electrochemical parameters continuously throughout volumetric addition, tracking potential curves in real time to locate equivalence jump points automatically.

The instrument runs on an intuitive Android 10 operating system displayed on a vibrant 7-inch capacitive touchscreen, allowing laboratory operators to switch between versatile routine testing and regulatory-compliant inspection workflows seamlessly. With a titration repeatability of ≤0.2% and titration analysis error ≤±1.5% conforming to JJG 814-2015 0.05 level standards, the HM-D4 provides complete volumetric analytical confidence, eliminating manual burette reading subjectivity and reducing analyst exposure to aggressive titrants.

Key Features

Closed-Loop Stepper Motor Drive: High-precision dosing mechanism achieves a theoretical resolution ≥1/1,500,000 (reliable resolution ≥1/300,000) and software-controllable minimum liquid addition down to 0.0001 mL (0.1 μL).
Interchangeable Integrated Fluidic System: Valve-burette integrated design enables rapid tool-free replacement of 10 mL (capacity tolerance ±25 μL) and 20 mL (capacity tolerance ±35 μL) glass burettes with PTFE pipelines highly resistant to strong acids, strong bases, and corrosive organic solvents.
Dual Operating Modes: Conventional titration mode allows researchers to customize addition volumes, waiting delays, and endpoint derivatives for exploratory research; specialized titration mode enables single-click execution of pre-programmed standard test procedures with direct output of sample concentration.
Multi-Endpoint Detection: Features dynamic, equivalent, preset endpoint, and manual titration options, supporting 1 to 5 sequential endpoint indices on complex multi-step titration curves.
GLP/GMP Data Integrity and Audit Trail: Equipped with three-level user permission administration (Administrator, Supervisor, Operator), immutable audit logging, and encrypted local storage for up to 100,000 titration records and complete titration curves.
Digital Connectivity and Reporting: Integrated thermal line printer provides instant printed receipts, while dual USB ports, Ethernet, and Wi-Fi facilitate seamless data export in PDF and Excel formats or direct synchronization with laboratory LIMS databases.
Automated Fluidic Maintenance: One-touch automated functions for bubble purging, pipeline cleaning, and reagent evacuation ensure clean fluidic circuits and protect operators from chemical contact.

Applications

The HM-D4 Automatic Potentiometric Titrator with Conductivity and Dead-Stop Modules provides versatile volumetric measurement across key analytical sectors:

Food and Beverage Quality: Determination of acid value and peroxide value in edible vegetable oils, total acidity in fruit beverages and dairy, and amino acid nitrogen in soy sauce and vinegar.
Environmental and Water Testing: Chemical oxygen demand (COD) permanganate index, chloride ion concentration via argentometric titration, and ammonia nitrogen quantification in surface and discharge waters.
Pharmaceutical and Fine Chemical Testing: Active pharmaceutical ingredient (API) purity assays, non-aqueous titrations, raw material verification, and cosmetic lotion acidity/alkalinity controls.
Petrochemical Industry: Total acid number (TAN) and total base number (TBN) in lubricating oils, mercaptan sulfur content, and purity analysis of basic chemical feedstocks.
Academic and Scientific Research: Reaction stoichiometry verification, complexation equilibria analysis, and precision chemical kinetics teaching.

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
Conductivity Measurement	0.00 μS/cm ~ 2000 mS/cm, Basic Error: ±1.0% FS
Permanent Stop Measurement	Polarization Voltage: 30 / 50 / 100 mV (±1 mV), Polarization Current: 0.00 ~ 200 μA (±1.0% FS)
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

Configuration and Accessories

The standard HM-D4 package includes all core analytical components required for immediate operation:

HM-D4 Potentiometric Titrator Host Unit (1 unit)
Standard Analytical Electrodes: Acid-base composite electrode, Redox electrode, Composite silver electrode, Conductive electrode, Double-platinum permanent stop electrode, Temperature sensor
Optional Electrodes: Complexometric titration electrode (optional upon request)
Interchangeable Titration Tubes: 10 mL and 20 mL precision glass burette assemblies (1 each)
Fluidic Protection: Visual filters (2 sets) and Titration tube protective sleeve (1 piece)
Electrode and Beaker Stand: Five-hole electrode holder (1 set) and Stainless steel support rod (1 piece)
Corrosion-Resistant Tubing: PTFE Teflon delivery tube (1.5 m) and PVC protective sleeve (1.5 m)
Fluidic Connectors: Quick-screw PEEK connectors (6 sets)
Sample Beakers: 100 mL polypropylene titration cups (5 pieces)
Magnetic Stirring Bars: PTFE magnetic stir bars (30 mm and 40 mm, 1 each)
Reagent Reservoir: 500 mL amber glass reagent bottle with specialized dual-port sealing caps (1 set)
Power and Documentation: Universal AC power cord (1 piece), User manual, calibration certificate, and warranty card (1 set)

Related Models

HM Instruments provides a cohesive series of automatic titrators tailored to diverse laboratory analytical scopes:

Model	Core Analytical Capabilities	Standard Analytical Electrodes	Target Analytical Application
HM-D1	Acid-base, Redox, Precipitation, Complexometric	pH composite, Redox ORP, Ag precipitation, Temp	General laboratory volumetric assays and teaching labs
HM-D2	Acid-base, Redox, Precipitation, Conductometric	pH composite, Redox ORP, Ag precipitation, Conductivity, Temp	Weak acids, weak bases, and mixed electrolyte systems
HM-D3	Acid-base, Redox, Precipitation, Permanent-Stop (Dead-Stop)	pH composite, Redox ORP, Ag precipitation, Dual-Pt Dead-Stop, Temp	Iodometry, diazotization, and sodium nitrite pharma assays
HM-D4	Acid-base, Redox, Precipitation, Conductivity, Dead-Stop	pH, Redox, Ag, Conductivity, Dual-Pt Dead-Stop, Temp (5 electrodes)	Flagship comprehensive analytical testing workstations

Operation and Support

Routine analysis with the HM-D4 is structured for laboratory efficiency and measurement reproducibility:

Sample Loading: Dispense the prepared sample solution into the 100 mL titration beaker, position the magnetic stir bar, and insert the electrodes and delivery tip into the 5-hole stand.
Method Selection: Select the target method from the pre-programmed standard library or create a custom method specifying stir speed, pre-stir delay, and endpoint differentiation threshold.
Automated Execution: Press Start. The closed-loop stepper motor dispenses titrant while the 7-inch display visualizes the titration curve dynamically until equivalence is locked.
Result Archiving: The instrument automatically calculates analyte content, triggers instant thermal receipt printing, and archives the run in the encrypted GLP database.
Maintenance: Initiate automated wash cycles through the touchscreen to flush pipelines between incompatible reagents.