The differential pressure density meter works based on Pascal's law. It measures the static pressure difference generated by a liquid column of fixed height (H) to infer the medium density.
In the heavy medium density control system, the density meter determines the quality of the separation effect, product quality, and economic benefits (clean coal loss, medium waste).
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Control target: Stabilize the suspension density at the set value (e.g., 1.45~1.55g/cm³)
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Dynamic response: When the accuracy is ±0.005g/cm³, the density fluctuation is reduced by 70%
The harsh working conditions in coal preparation plants (abrasion, corrosion, bubbles, slime interference, vibration) pose a severe test to the performance and service life of density meters. How to ensure accurate measurement accuracy while reducing the frequency of product replacement is the key to ensuring the long-term stable operation of the system.
The NYMD differential pressure density meter of Nuoying Jiaye adopts a 316L stainless steel diaphragm, which has high wear resistance and corrosion resistance; the flange and measuring chamber are made of 304 stainless steel; the DC200 silicone oil filling ensures higher sensitivity.
It has a built-in temperature compensation function, and the inside and outside of the pipeline are treated with immersion-type PTFE anti-corrosion, leaving no dead ends or bubbles, thus extending the service life of the product.
- Accuracy: 0.002g/cm³
- Linearity: 0.1%
- Response sensitivity: 0.2s
The prices of differential pressure density meters vary from several thousand to tens of thousands of yuan, which is fundamentally due to differences in product workmanship and materials. Some products on the market may use ordinary 316L or even lower-grade stainless steel, which is insufficient in wear resistance. Therefore, some customers report that the diaphragm is severely worn or even leaks after only a few months of use.
According to the feedback from actual cases, the NYMD differential pressure density meter can operate stably and measure accurately for 2 to 3 years, or even more than 5 years. High-quality products can reduce maintenance costs and the risk of shutdown.
- Official Account: Nuoying Automation (NuoYing Automation)
Case: Heavy medium system transformation in a large state-owned coal preparation plant
- Background: The original imported density meter had a long production cycle and could not guarantee after-sales service.
- Implementation effect:
- The measurement accuracy is stably within ±0.002g/cm³.
- The 316L diaphragm has no wear failure for 3 years, and the maintenance cost (spare parts cost, labor cost) is significantly reduced.
The differential pressure density meter is the "industrial eye" of heavy medium separation, and its accuracy and service life are equivalent to economic benefits. Against the background of increasing coal quality fluctuations and greater benefit pressure, choosing a differential pressure density meter with high wear resistance and long service life can become a core technical support for coal preparation plants to reduce costs and increase efficiency.
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