Remove fine contamination.
Extend hydraulic oil life.
Continuous electrostatic cleaning removes fine particles, resins and oxidation products from non-conductive oils. Bypass installation helps reduce hydraulic-system faults and oil-change maintenance.
D2, D4, D8 and D16 cover different oil volumes. DSD requires oil with water content below 500 ppm; for wetter oils, ask about a configuration with dehydration.
DSD Product & Application Gallery
How the DSD Electrostatic Oil Cleaner Works
An electrostatic field can be established only when virtually no electrical current flows. During purification, the conductivity of the treated fluid must therefore remain as low as possible.
Water in the oil has an adverse effect on this requirement. For electrostatic oil cleaning with the FRIESS DSD series, the oil must be suitable for the process from the outset—its water content must be below 500 ppm. Only then can the electrical resistance remain sufficiently high.
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With different control configurations, FRIESS electrostatic oil-cleaning stages can be adapted flexibly to a wide range of applications. The system can purify one large oil tank or several smaller tanks.
Advantages
- Precise operation of hydraulic systems
- Lower maintenance, repair and oil-change costs
- Reduce hydraulic-oil consumption by up to 95%
- Reduce hydraulic failures by up to 70%
- Increase machine availability and extend hydraulic-oil service life to 100,000 operating hours or more








Technical Data
- Models: D2 / D4 / D8 / D16
- Flow rate: 2.5 / 4 / 8 / 16 L/min
- Dirt-holding capacity per collector set: 0.3 / 1 / 2 / 4 kg
- Oil temperature: max. 60 °C
- Oil viscosity at operating temperature: max. 100 mm²/s
- Power consumption: max. 500 W
- High voltage: 14 kV
- Power supply: 230 V / single phase
- Water content in oil: max. 500 ppm
- Dimensions (L × W × H):
- 450 × 400 × 940 mm
- 850 × 650 × 1080 mm
- 850 × 650 × 1080 mm
- 1065 × 780 × 1090 mm
- Permitted oil types:
- Hydraulic oils H / HL / HLP
- Lubricating oils C / CL / CLP
- PAO-based synthetic oils
- Specific performance data apply to oils containing D additives
- Safety equipment:
- Control-panel cover, drip tray with leak-protection system, and control cabinet with cylinder lock
Advantages
- Significantly reduce hydraulic failures and extend hydraulic-oil service life to more than 100,000 operating hours.
- Save maintenance, repair and oil-change costs with FRIESS electrostatic oil cleaning.
- Reduce oil consumption by up to 90%.
- Raise your machines to a new level of performance.
- Improve process safety.
In addition to cost savings, FRIESS oil skimmers, electrostatic oil cleaners, magnetic filters, coolant purification systems, oil-water separators and vacuum oil purifiers provide many other benefits.
We would be pleased to explain how they can benefit your operation.