Dual Canopy Mechanic Electrical Engineering Co., Ltd. is one of the leading manufacturers and suppliers of density meter in China. Please feel free to wholesale discount products for sale here and get quotation from our factory. Customized orders are welcome.
What is a density meter used for?
The Transformer Oil Density Meter is a precision analytical instrument designed to measure the mass per unit volume (density) of insulating oil used in power transformers, reactors, and oil-filled electrical equipment. Accurate density measurement is a fundamental indicator of oil aging, contamination, moisture ingress, and thermal degradation - all of which directly affect a transformer's insulation performance and operational lifespan.
Transformer insulating oil - predominantly mineral naphthenic oil conforming to IEC 60296 and ASTM D3487 - has a reference density of approximately 0.895 g/cm³ at 20°C. As the oil ages, oxidizes, or becomes contaminated with moisture, particulates, or dissolved gases, its density shifts measurably. Studies published by CIGRE Working Group A2.49 have shown that density deviation of more than ±0.005 g/cm³ from the baseline value can indicate significant oil degradation requiring immediate attention.
Our Transformer Oil Density Meter provides laboratory-grade accuracy in a field-deployable form, enabling power utilities, transformer maintenance teams, and OEM manufacturers to make data-driven decisions about oil replacement, filtration, or transformer overhaul - without sending samples to an external laboratory.
What do the core technical specifications include?
Adopt high-precision microcomputer control, fast speed and high precision;
Adopt PID self-tuning temperature control technology, high temperature control accuracy;
320×240 dot matrix LCD display, touch-sensitive buttons;
Built-in high-speed thermal micro-printer, beautiful and fast printing, with offline printing function
Equipped with standard RC232 interface, can be connected to a computer, easy to process test data;
Experimental records can be saved for later viewing;
| Operating Temperature | −10°C to +50°C |
| Protection Rating | IP54 (portable model) |
| Dimensions | 280 × 180 × 120 mm (portable model) |
| Weight | 2.8 kg |
| Certifications | ISO 9001:2015, CE, IEC 61326-1 (EMC), CNAS calibration certificate |
| Compliance Standards | IEC 60296, ASTM D1298, ASTM D4052, ISO 12185, GB/T 2536 |
What do "Key Product Features & Technical Advantages" include?
Our density meter employs the digital oscillating U-tube method, which is recognized by ASTM D4052 and ISO 12185 as the highest-accuracy method for liquid density determination. A borosilicate glass U-tube filled with the oil sample is electromagnetically excited into oscillation. The natural oscillation frequency is precisely inversely proportional to the density of the liquid filling the tube - the denser the liquid, the slower the oscillation. A high-precision frequency counter measures this oscillation and converts it to a density value via a factory-calibrated mathematical model.
Why this matters:
The oscillating U-tube method eliminates the human error, meniscus reading inaccuracies, and temperature sensitivity inherent in traditional hydrometer-based methods (ASTM D1298). In comparative testing, the oscillating U-tube method achieves a repeatability of ±0.0002 g/cm³ versus the hydrometer method's ±0.001 g/cm³ - a 5× improvement. For wholesale buyers supplying testing laboratories or utility maintenance teams, this accuracy level is often required to meet national grid company specifications.
Oil density is highly temperature-dependent - mineral transformer oil density changes by approximately 0.00065 g/cm³ per °C. Without accurate temperature compensation, a 10°C measurement error would translate to a 0.0065 g/cm³ density error - larger than the diagnostic threshold for oil degradation.
Our meter incorporates two independent PT100 platinum resistance temperature sensors (IEC 60751 Class A, accuracy ±0.15°C) - one monitoring the sample temperature inside the U-tube, and one monitoring the ambient temperature of the measurement cell. The onboard processor applies IEC 60296 Annex C density-temperature correction algorithms to automatically report density at the standard reference temperature of 15°C or 20°C, regardless of actual sample temperature.
Where Is the Transformer Oil Density Meter Used?
Primary Application: Power Transformer Oil Condition Monitoring
Transformer oil (also called insulating oil or dielectric oil) serves three critical functions in a power transformer:
Electrical insulation - prevents arc discharge between high-voltage windings
Thermal cooling - carries heat away from the core and windings
Arc quenching - in tap changers and oil-filled circuit breakers
What application environments and industries do density meters cover?
| Industry Sector | Specific Application | Equipment Type |
|---|---|---|
| Electric Power Utilities | Routine oil condition assessment, incoming oil inspection | Power transformers 35kV–1100kV, shunt reactors |
| Transformer Manufacturers | Factory QC of new oil filling; final inspection before delivery | Distribution transformers, power transformers |
| Oil Refineries & Suppliers | Incoming quality control of transformer oil batches | Bulk oil storage and tanker reception |
| Industrial Facilities | Maintenance of in-plant transformers | Furnace transformers, rectifier transformers, industrial power distribution |
| Mining Operations | Remote site transformer maintenance | Mining site substations, dragline transformers |
| Railway & Transit | Traction transformer oil monitoring | Railway traction substations, EMU transformers |
| Renewable Energy | Wind and solar farm transformer maintenance | Offshore wind transformer, photovoltaic step-up transformers |
| Oil Testing Laboratories | Certified oil analysis services | Commercial testing laboratories, utility QC labs |
Who Are the Typical End-Users?
National and regional power grid companies (e.g., State Grid Corporation of China, Eskom, National Grid UK, Saudi Aramco Power)
Independent power producers (IPPs) and energy companies
Transformer manufacturers (incoming oil QC and outgoing product inspection)
Transformer oil manufacturers and distributors (product quality verification)
Commercial oil testing laboratories (offering oil analysis as a service)
Industrial plant maintenance departments (steel mills, chemical plants, refineries)
Engineering procurement and construction (EPC) contractors (commissioning inspection)
Military engineering and field maintenance units
University and research laboratories (material science, dielectric research)
Our address
Baoding Cloud Center, Hebei, China
Phone Number
+8613603329412
dylan@dualcanopy.com
FAQ
Q1: What is transformer oil density?
A: Transformer oil density is the mass of oil per unit volume, expressed in g/cm³ or kg/m³ at a specified reference temperature (typically 15°C or 20°C per IEC 60296). Fresh mineral transformer oil typically has a density of 0.895 ± 0.005 g/cm³ at 20°C.
Q2: Can the instrument measure other oils besides transformer insulating oil?
A: Yes. The oscillating U-tube measurement principle works for any homogeneous liquid within the density range of 0.600–1.200 g/cm³.
Q3: How do you ensure batch-to-batch consistency for large wholesale orders?
A: Batch consistency is one of the most critical quality attributes for wholesale buyers managing large fleets of instruments.
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