ChemTron DM-250.2N Portable Immersion Density Meter
| Brand | ChemTron |
|---|---|
| Origin | Germany |
| Model | DM-250.2N |
| Density Range | 0–3 g/cm³ (0–3000 kg/m³) |
| Density Accuracy | ±0.0003 or ±0.0005 g/cm³ (±0.3 or ±0.5 kg/m³) |
| Temperature Range | −40 to +85 °C |
| Temperature Accuracy | ±0.1 or ±0.2 °C |
| Density Repeatability | ±0.00015 or ±0.00025 g/cm³ (±0.15 or ±0.25 kg/m³) |
| Temperature Repeatability | ±0.1 °C |
| Max. Immersion Depth | 30 m |
| Data Storage Capacity | 2000 measurements |
| Battery | NiMH 3.6 V, 1500 mAh |
| Operating Time (fully charged) | ~12 h |
| Display | OLED with backlight |
| Sensor Materials | SS 316L stainless steel, NiSpan C, or Hastelloy C-22 (optional) |
| Compliance | ATEX, IECEx, UL/CSA HazLoc |
| Units Supported | g/cm³, kg/m³, lb/gal, lb/ft³, API gravity, specific gravity (SG), ASTM D1250 petroleum tables, alcohol tables, temperature (°C/°F) |
Overview
The ChemTron DM-250.2N is a high-precision, portable immersion density meter engineered for in-situ density and temperature measurement of liquids directly within storage tanks, pipelines, and process vessels. Unlike benchtop or laboratory-based density analyzers, the DM-250.2N operates on the hydrostatic principle—measuring the differential pressure exerted by a column of liquid at a known depth—to derive density without requiring sample extraction, conditioning, or transfer. This eliminates sampling bias, thermal equilibration delays, and contamination risks associated with conventional grab sampling. Its robust, submersible probe design supports immersion depths up to 30 meters, enabling stratification profiling across vertical cross-sections of large-volume tanks. The instrument integrates real-time temperature sensing via a high-stability platinum RTD sensor, enabling automatic temperature compensation per ISO 12185 and ASTM D4052 standards. Designed for continuous operation in ambient conditions ranging from −40 °C to +85 °C, it meets the environmental demands of offshore platforms, refinery terminals, biofuel production facilities, and pharmaceutical manufacturing suites.
Key Features
- Submersible probe rated for up to 30 m immersion depth, with optional corrosion-resistant materials including Hastelloy C-22 and NiSpan C for aggressive chemical environments
- High-resolution OLED display with adjustable backlight for low-light and outdoor operation
- Dual-density calibration ranges: 0.6–1.2 g/cm³ and 0.9–1.8 g/cm³, supporting accurate measurement across light hydrocarbons, ethanol blends, and viscous process streams (up to 2000 cP)
- ATEX Zone 0/1, IECEx, and UL/CSA Class I Div 1 hazardous area certifications—enabling safe deployment in flammable vapor environments
- Integrated temperature compensation compliant with ASTM D1250, D1298, and ISO 91-1 for petroleum and chemical applications
- Onboard data logging (2000 measurement records) with time/date stamping, depth tagging, and temperature synchronization
- Bluetooth 5.0 and USB-C interfaces for secure wireless or wired data export—compatible with Windows, macOS, and Linux platforms
- Low-maintenance architecture: no moving parts, sealed electronics, and IP68-rated housing
Sample Compatibility & Compliance
The DM-250.2N is validated for direct measurement of homogeneous and moderately stratified liquid phases—including crude oil, refined fuels, biodiesel, ethanol-water mixtures, syrups, solvents, pharmaceutical excipients, and cosmetic emulsions. It is not intended for suspensions, slurries, or highly aerated media where particle settling or gas entrainment may compromise hydrostatic equilibrium. Regulatory compliance includes full traceability per ISO/IEC 17025 requirements when used in accredited testing laboratories. Firmware supports audit-ready data export with embedded metadata (operator ID, location tag, calibration certificate ID), satisfying FDA 21 CFR Part 11 electronic record integrity criteria when paired with validated software workflows. All units ship with factory calibration certificates traceable to NIST and PTB standards.
Software & Data Management
Data acquisition and reporting are supported through ChemTron’s proprietary DensLink Desktop Suite—a GLP-compliant application that enables batch import, stratification mapping, statistical analysis (mean, standard deviation, gradient slope), and PDF report generation. Each measurement file contains raw sensor outputs, compensated density values, temperature readings, GPS coordinates (when connected to external GNSS), and operator-defined tags. Export formats include CSV, Excel (.xlsx), and XML for integration into LIMS, MES, or SCADA systems. Bluetooth pairing supports real-time streaming to mobile tablets running Android or iOS, facilitating field verification during tank gauging audits or custody transfer operations.
Applications
- Petroleum upstream/downstream: In-tank density profiling for inventory reconciliation, API gravity determination, and blend uniformity verification in crude oil, gasoline, and jet fuel storage
- Biofuel production: Real-time ethanol concentration monitoring during fermentation and distillation, complying with EN 15376 and ASTM D5501
- Food & beverage: Brix estimation in juice concentrates, sugar syrup density control, and alcohol content validation in spirits
- Pharmaceutical manufacturing: Excipient solution density verification per USP , cleaning-in-place (CIP) rinse water conductivity correlation, and solvent recovery tracking
- Chemical distribution: On-site verification of bulk chemical deliveries (e.g., sulfuric acid, caustic soda, glycols) against specification sheets
- Environmental monitoring: Density-driven interface detection in layered groundwater plumes or containment pond stratification studies
FAQ
Is the DM-250.2N suitable for measuring density in pressurized pipelines?
Yes—when used with an appropriate pressure-rated probe housing and certified conduit entry, the instrument supports static pressure environments up to 10 bar (gauge). Dynamic flow correction is not applied; measurements assume laminar, non-turbulent conditions.
How often does the unit require recalibration?
Annual calibration is recommended under routine use. Field verification using certified reference fluids (e.g., distilled water at 20 °C, n-decane at 15 °C) is advised before critical measurements.
Can the device measure density gradients in real time during tank filling or emptying?
Yes—continuous depth-resolved logging allows temporal tracking of density layer migration, supporting dynamic interface detection and overfill prevention protocols.
Does the firmware support multi-language UI?
English and German interfaces are pre-installed; additional language packs (French, Spanish, Chinese) are available upon request and firmware update.
What is the warranty coverage and service support structure?
ChemTron provides a 24-month limited warranty covering materials and workmanship. Global service centers in Houston, Rotterdam, Singapore, and Shanghai offer repair, recalibration, and technical support with documented turnaround SLAs.
