RPM Series Liquid Level Sensors

The RPM series custom continuous level sensors are designed to meet demanding customer requirements for reliable operation. Models are available in lengths up to 6 m (20 ft.) with a variety of mounting configurations. Output options include resistive chain or loop powered 4-20 mA.

Only one moving part, a float, travels up and down a vertical stem. A permanent magnet inside the float acts on a series of closely spaced reed switches and resistors inside the stem. The total resistance value is converted into a voltage or current signal that is proportional to the level of the liquid.

Applications

The RPM level sensors have numerous applications in the chemical, oil, shipping, food processing, waste treatment, and many other industries. Because they are manufactured to user specifications, the RPM units fit and work precisely to the application requirements.

APG, RPM, Series, Liquid, Level, SensorsResistive Chain Level Sensor

  • Continuous level indication

  • Resistive chain or loop powered 4-20 mA output

  • Lengths up to 20 ft.

  • Highly rugged and reliable

  • 0.5 in. or 0.25 in. resolution

  • Available with hazardous ratings (see datasheet for details)

  • Anti-stick float design

  • Proven reliability in operation

Specifications

Supply Voltage:
   Resistive Chain Output: 0-5, 0-10, 0-15 VDC
   4-20 mA Output: 12-24 VDC
Resolution:
   Standard: 13 mm (0.5 in.)
   High: 7 mm (0.25 in.)
Hysteresis:
   Standard: ±7 mm (0.5 in.)
   High: ±3 mm (0.12 in.)
Stem Length: 122 to 610 cm (48 to 240 in.)
Measurement Length: Stem length – (S1 + S2)
Top Deadband S1: See ordering information
Bottom Deadband S2: See ordering information
Cable Entry: 3/4 in. NPT
Housing Material: Cast aluminum
Stem Material: 316L SS
Float Material: Polyurethane, 8 in. OD (0.44 SG) or 316L SS, 5 in. OD (0.5 SG)
Operating Temperature: -40 to 85°C (-40 to 185°F)
Maximum Pressure: 72.5 psi (5 bar)
Hazardous Location Approvals (Contract # 237484):
    CSA Explosion Proof: Class I, Div. 1, Groups C & D
    CSA Intrinisically Safe: Exia Class I, Div. 1, Groups C & D (4-20 mA only)
    ATEX Intriniscally Safe: EX II 1 G EEx ia IIB T3 Ambient: -40 to 85°C


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