SOR Single-Point RF Level Switch with Self Test, 681
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681 Single-Point RF Level Switch with Self Test

Brand: SOR Inc
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Available as an integral or remote-mounted unit, the 681 provides single-point switching, and with its many safe and operation features, is well suited for demanding industrial applications. 

Its “Self-Check” function constantly monitors circuit and probe integrity. A dedicated relay (line powered) or current shift (loop-powered) indicates if the unit is not functioning properly. 

An optional, adjustable differential provides control of two set points with one relay, which gives the 681 pump and valve control for maintaining correct process levels.
Features
  • Continuous self testing (self-check) verifies operation of the unit
  • Optional adjustable differential for pump/valve control
  • Available as integral or remote-mounted
  • Field-selectable failsafe
  • Optional on/off time delay eliminates effects of turbulence
  • Resists process media coating

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Specifications

Brand

Adjustment Type

  • Field Adjustable Fail-safe

Approvals & Certifications

  • Certificate of Calibration
  • Compliance/Conformance
  • Inspection Certificate
  • Insulation Resistance

Conduit Connection

  • 3/4” NPT

Distance

  • Maximum

Electrical Protection

  • Electrostatic Discharge Protection 4,000 V (Loop), 8,000 V (Line)
  • Line Surge Suppression 1,000 V, Line Voltage EMC

Enclosure Finish

  • Housing Exterior: Fungicidal Varnish
  • Powder Epoxy Coated

Environmental Protection

  • IP65
  • IP66
  • NEMA 4X

Input Power

  • Input Power (Line): 12 Vdc
  • Input Power (Line): 120 Vac, 50/60 Hz
  • Input Power (Line): 24 Vdc
  • Input Power (Line): 240 Vac, 50/60 Hz
  • Input Power (Loop): 10-30 Vdc

Loop Resistance

  • 456 ohms, Max.

Maximum Current

  • Draw (Line Power): 100 mA at 12 Vdc, 24 Vdc
  • Draw (Line Power): 13 mA, 240 Vac
  • Draw (Line Power): 25 mA, 120 Vac

Measuring Range

  • 0 to 1,000 PF

Mounting

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

Name Plate, Tag Material

  • Stainless Steel
  • Fiber

NPT Connection

  • 1” NPT Male
  • 1-1/2” NPT Male
  • 2” NPT Male
  • 3/4” NPT Male

Output

  • Output Typical (Line) for Alarm, Sensor Monitor: 10 A DPDT at 250 Vac
  • Output Typical (Line) for Alarm, Sensor Monitor: 10 A DPDT at 30 Vdc
  • Output Typical (Loop) for Alarm: 16 mA (Normal)
  • Output Typical (Loop) for Alarm: 8 mA (Alarm)
  • Output Typical (Loop) for Sensor Monitor: 24-27 mA

Repeatability

  • 0.5%

Response Time

  • 0.1 second

Sensitivity

  • Range I - 0 to 300 PF: 0.5 PF
  • Range II - 300 to 1,000 PF: 1 PF

Switch Type

  • DPDT

  • Industrial Applications

Documentation

Catalogs

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