Aleph Flow Sensors

Aleph Flow Sensors

  • By use of a resin case and a reed switch detection element, we have produced a flow sensor which is extremely simple, compact, lightweight and economical.
  • Due to the use of a reed switch, the flow sensor offers a long life and excellent environmental characteristics. There is virtually no damage caused by frequent and excessive switching and secular change. It is possible to detect accurately the amount of flowing liquid over a long period.
  • Due to utilizing a built-in thermistor, it is possible to detect temperature and liquid flow at the same time (optional). Since it complies with food and hygiene regulations, it is suitable for a wide range of applications.


  • Control of circulating chilled water in machine.
  • Control of various amounts of flowing liquid in a small-scale process.
  • Detection of amount of flowing liquid in a pump, hot water and warm water supplies.


Type RPS-111011-101 RPS-112011-101 RPS-113511-101 RPS-115011-101
Operating Characteristics (In water) ON Point 1.0 ±0.3 l/min. 2.0 ±0.4 l/min. 3.5 ±0.5 l/min. 5.0 ±0.5 l/min.
OFF Point 0.7 ±0.3 l/min. 1.5 ±0.4 l/min. 2.7 ±0.5 l/min. 4.2 ±0.5 l/min.
Withstanding Pressure 8 kgf/cm2
Pressure Loss 0.2 kgf/cm2 or less (in 10 l/min.
Electrical Characteristics Maximum Contact Rating 5 W
Maximum Switching Voltage 100 V
Maximum Switching Current 0.25 A
Contact Withstand Voltage 250 V
Contact Resistance 0.2W max.
Temperature Range -10 to +80°C
Applicable Liquid Water, propylene glycol, ethylene glycol and oils*
Materials Case: PP, 6 Nylon; Spring: SUS; Float: PP, 6 Nylon
Quantity of flowing liquid detected Can be set within the range of 1 to 7 l/min.
  * Note: When using oil, the material sometimes needs to be changed depending upon the kind of oil. Therefore, please contact us.