SOR Ultrasonic Switch, 721
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721 Ultrasonic Switch

Brand: SOR Inc
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The 721 ultrasonic switch is an advanced single-point device designed to meet your needs for overfill protection. 

The 721 includes a “Sensor Monitor.”  This circuit continuously tests the functionality of the electronics and sensor. The “Sensor Monitor Relay” de-energizes if a fault is detected. 

The 721 is available with a variety of sensor types to meet most process conditions. 

It is available integral or remote mounted and comes standard with field-selectable failsafe.
Features
  • No calibration required
  • Continuous self-test (sensor monitor) verifies operation
  • FM Approved or CSA Certified for hazardous locations
  • Field-selectable failsafe
  • On/Off time delay is standard
  • Rostechnadzor (RTN) standard certificate

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Specifications

Brand

Adjustment Type

  • Fail-safe: Field Adjustable

Ambient Temperature Range

  • -40° to 71° C (-40° to 160° F)

Approvals & Certifications

  • CRN
  • CSA: Class I, Groups C, D, Class II, Groups E, F, G, Class III, Div. 1
  • FM: Class I, Groups C, D, Class II, Groups E, F, G, Class III, Div. 1
  • RTN

Cable Length

  • Remote Cable: 50 feet (15.2 metres)

Conduit Connection

  • 3/4” NPT

Delay Time

  • 0 to 30 seconds

Electrical Contacts

  • Gold-Contact Relay

Enclosure Finish

  • Housing Exterior: Fungicidal Varnish
  • Powder Epoxy Coated
  • Powder-Coated Epoxy

Environmental Protection

  • Explosion-proof
  • Intrinsically Safe
  • IP65
  • IP66
  • NEMA 4X

Input Power

  • Input Power (Line): 120 Vac, 50/60 Hz
  • Input Power (Line): 24 Vdc
  • Input Power (Line): 240 Vac, 50/60 Hz
  • Input Power (Loop): 11-36 Vdc Intrinsically Safe

Loop Resistance

  • 650 ohms, Max.

Maximum Current

  • Draw (Line Power): 220 mA, 24 Vdc
  • Draw (Line Power): 30 mA, 240 Vac
  • Draw (Line Power): 60 mA, 120 Vac

Mounting

  • Pipe Mounting Kit
  • Remote Electronics Flat-Surface Mounting Bracket

Name Plate, Tag Material

  • Stainless Steel
  • Fiber

Output

  • Output Typical (Line): 10 A DPDT at 250 Vac
  • Output Typical (Line): 10 A DPDT at 30 Vdc
  • Output Typical (Loop): 16 mA (Wet) for Alarm
  • Output Typical (Loop): 19 mA Sensor Monitor
  • Output Typical (Loop): 5 mA Sensor Monitor
  • Output Typical (Loop): 8 mA (Dry) Alarm

Pressure Range

  • psi: 2,000 (kPa: 13,800, bar: 138) - Max.

Process Temperature

  • -40° to 121° C (-40° to 250° F)

Repeatability

  • 0.078” (2 mm)

Response Time

  • Response Time (Line Power): 250 milliseconds (ON/OFF)
  • Response Time (Loop Power): 0.5 second (ON)
  • Response Time (Loop Power): 5 seconds (OFF)

Sensor, Probe Material

  • Metal
  • Teflon

Sensor, Probe Style

  • Ultrasonic

Sensor, Probe Type

  • Notch
  • Viscous

Switch Type

  • DPDT Relay

Documentation

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