DMA Series Electromagnetic Flowmeter Overview
DMA15, DMA20, DMA25, and DMA50 are four specifications of electromagnetic flowmeters produced by E+H, widely used in industrial flow measurement. This article systematically introduces their selection key points and typical application scenarios to help engineering technicians and procurement personnel make quick decisions.
Key Factors for Selection
Selecting the appropriate model requires comprehensive consideration of five aspects: measuring medium, pipe diameter, accuracy, working pressure, and environmental conditions.
1. Measuring Medium
All four models can measure liquids and gases, but the applicable media vary by specification. Generally, DMA15 and DMA20 are suitable for small-diameter water, sewage, acids, and alkalis; DMA25 and DMA50 are suitable for large-diameter oil, natural gas, etc.
2. Measuring Pipe Diameter
Different models support different pipe diameter ranges, and selection should be based on actual pipeline size. The specific correspondence is as follows:
| Model | Applicable Pipe Diameter Range |
|---|---|
| DMA15 | DN10-DN60 |
| DMA20 | DN10-DN80 |
| DMA25 | DN40-DN300 |
| DMA50 | DN80-DN600 |
3. Measuring Accuracy
Accuracy directly affects the accuracy of flow measurement. DMA15 and DMA20 have higher accuracy, up to ±0.5%; DMA25 and DMA50 have an accuracy of ±1%. Actual accuracy is also affected by fluid characteristics, installation conditions, and other factors.
4. Working Pressure
It must be ensured that the flowmeter can withstand the actual working pressure. The pressure ranges for each model are as follows:
| Model | Working Pressure Range |
|---|---|
| DMA15 | 0-4.0 MPa |
| DMA20 | 0-6.4 MPa |
| DMA25 | 0-16.0 MPa |
| DMA50 | 0-32.0 MPa |
5. Environmental Conditions
For high-temperature, low-temperature, or corrosive environments, flowmeters with corresponding protection ratings and materials should be selected. If remote control or automation is required, models with digital communication interfaces should be chosen.
Typical Application Scenarios
DMA series electromagnetic flowmeters are widely used in the following industries:
Water Treatment Industry
Used to measure the flow of tap water, sewage, and other liquids. DMA15 and DMA20 are suitable for household or small water treatment facilities; DMA25 and DMA50 are suitable for industrial or large water treatment facilities.
Oil and Gas Industry
Used to measure media such as oil and natural gas. Due to medium characteristics, models with high pressure resistance should be selected, such as DMA25 and DMA50.
Chemical Industry
Used to measure corrosive media such as acids, alkalis, and solvents. In this case, electromagnetic flowmeters with corrosion resistance should be selected.
Summary
When selecting a model, it is necessary to comprehensively evaluate the medium, pipe diameter, accuracy, pressure, and environmental conditions. DMA15/20 are suitable for small-diameter, high-accuracy applications, while DMA25/50 are suitable for large-diameter, high-pressure applications. Correct selection ensures accurate and reliable flow measurement and meets industrial needs.