Ultrasonic Liquid Level Switches

The LVU-230 and LVU-260 liquid level switches are the ideal solution to a host of liquid-level sensing and control applications. Their small size and standard ¾NPT fittings make them suitable for new or existing applications. The LVU-230 models have a relay output along with a 316 SS or PVDF^® sensor and an integral miniaturized, encapsulated electronic control unit mounted in a cast aluminum, explosion-proof, watertight enclosure. The LVU-260 is a 2-wire, 4 or 20 mA output system.

Both use an ultrasonic wave propagation sensor mounted in the liquid medium. The electronics generates a continuous wave ultrasonic signal that completely illuminates the liquid-sensing area. The absence of liquid in the sensing area causes the ultrasonic signal to dissipate, which the electronics senses as a "dry" condition (and provides a 4 mA output signal in the LVU-260). When liquid is present, the amplitude of the ultrasonic signal increases, indicating a "wet" condition. This signal is converted by the electronics and energizes the 10 A relay (LVU-230) or a 20 mA output signal (LVU-260). The LVU-230 electronics may be set to provide the control output to an alarm, pump, or other device on either a dry or wet condition. 

SPECIFICATIONS
Repeatability: 2 mm (0.08") typical
Delay (On): 0.5 s
Input Power:
    LVU-230: 115 Vac 50/60 Hz standard; 230 Vac 12 Vdc, or 24 Vdc (optional)
    LVU-260: 9 to 30 Vdc
Outputs:
    LVU-230: 10 A DPDT
    LVU-260: Low-level fail-safe: 4 ±1 mA dry; 20 ±1 mA wet; high level: 20 ±1 dry, 4 ±1 wet
Housing: NEMA 4/NEMA 7 watertight, explosion-proof enclosure, cast aluminum Class I, Group C and D, Class II, Groups E, F and G; and Class III, Division I and 2
Sensor Material:
    LVU-230S, LVU-260S: 316 LSS
    LVU-230K, LVU-260K: PVDF
Temperature:
    Sensor: -40 to 148°C (-40 to 300°F)
    Electronics: -29 to 77°C (-20 to 170°F)
Operating Pressure: Up to 1000 psig
Mounting: ¾ NPT standard
Weight: 453g (1lb)