SRL Series Hitachi Oil Free Air Compressors
Range: 1.5 kW to 33 kW

Low Noise, Low Vibration, High Reliability.
Space Saving, Energy Saving with Multi-Drive Control.

Scroll Compression Principle

Compressor sucks air through air inlet located at outer scroll.
Compression chamber goes smaller with rotary movement and trapped air is compressed.
Compression chamber becomes minimum volume at the center of the scroll and air is pumped out through air outlet located at the center of scroll.
These, suction, compression & discharging, process is repeated continuously.

Low Noise, Low Vibration

Noise level is only 45dB that is like in the library (1.5 kW)

For Example: Pencil on the top roof keeps standing during operation.

Easy to Use

Few daily check items and easy to check, total cost saving.

No need to change oil and separate the oil from drain. No need to install oil mist filter as well.*
Well-designed structure utilized easy maintenance of draining and cleaning of suction filters.

* In case that the suction air is thought to contain oil, it is necessary to install oil mist filer.

Energy-Saving with Multi-Drive Control

Multi-Drive control method is added to the conventional pressure switch control method. It is also possible to easily change between Multi-Drive control and pressure switch control by operation of switch button.

Under Multi-Drive control mode, the operation of SRL heads is modified automatically responding to the need of air.

Optimized operation which can keep the necessary pressure is possible.

P-Mode: Same as conventional pressure switch control method, if the pressure reaches max pressures, the operation of compressor will stop. When the pressure deceases to the cut-in pressure, the operation of compressor will restart.

Multi-Drive Mode: The operation of compressor is automatically controlled to keep the pressure around necessary pressure (control pressure). Unnecessary power consumption is prevented by avoiding the pressure to reach max pressure. So, energy-saving is possible.