The general purpose level switch package provides high or low liquid level detection with one 16A compact relay controller for pump or valve shut off. The optional flash alarm brings attention to alarm conditions. Available in three level sensor technologies, choose the sensor type based upon your application media. This PP or PVDF level switch package is selected for bulk storage, IBC or drum, and neutralization tank applications, requiring detection and control.


  • Fail-safe relay shut off of pumps or valves with adjustable time delay
  • Offered in three sensor technologies for broad application coverage
  • Rugged polypropylene or PVDF construction for use with corrosive liquids
  • Easy setup with LED indicators for sensor, power and relay status
  • Optional strobe brings immediate attention to level alarm conditions
  • Polypropylene enclosure rated NEMA 4X with swivel base for conduit alignment
  • Invert switch changes relay state from NO to NC without rewiring


P/N Description From
AU13-4213-A Ultrasonic, PP, w/strobe, 2″ NPT $690.00
AU13-4217-A Ultrasonic, PP, w/strobe, 1-1/2″ G $700.00
AU13-4223-A Ultrasonic, PP, 2″ NPT $640.00
AU13-4227-A Ultrasonic, PP, 1-1/2″ G $650.00
AU13-5213-A Ultrasonic, PVDF, w/strobe, 2″ NPT $855.00
AU13-5217-A Ultrasonic, PVDF, w/strobe, 1-1/2″ G $865.00
AU13-5223-A Ultrasonic, PVDF, 2″ NPT $805.00
AU13-5227-A Ultrasonic, PVDF, 1-1/2″ G $815.00
AV13-4213-A Buoyancy, PP, w/strobe, 2″ NPT $525.00
AV13-4217-A Buoyancy, PP, w/strobe, 1-1/2″ G $535.00
AV13-4223-A Buoyancy, PP, 2″ NPT $475.00
AV13-4227-A Buoyancy, PP, 1-1/2″ G $485.00
AV13-5213-A Buoyancy, PVDF, w/strobe, 2″ NPT $690.00
AV13-5217-A Buoyancy, PVDF, w/strobe, 1-1/2″ G $695.00
AV13-5223-A Buoyancy, PVDF, 2″ NPT $640.00
AV13-5227-A Buoyancy, PVDF, 1-1/2″ G $645.00


Select ultrasonic for chemicals and light weight oils; vibration for wastewater with light coating or scaling; buoyancy for clean water and non-coating chemicals.



Length: 6” to 10’ (15cm to 3m)

Accuracy: ± 1mm in water

Repeatability: ± 0.5mm in water

Orientation: ± 20° vertical

Switch points: 1 (factory set)

Supply voltage: 120 / 240 VAC @ 50-60 Hz.

LED indication: Sensor, power & relay

Consumption: 0.25A maximum

Strobe type: -X22X: N/A, -X21X: xenon tube

Strobe flash: -X22X: N/A, -X21X: 1 per second

Contact type: (1) SPDT relay

Contact rating: 250 VAC @ 10A

Contact output: Selectable NO / NC

Contact delay: 0.15 – 60 seconds

Process temp.: F: -40° to 176°, C: -40° to 80°

Ambient temp.: F: -40° to 140°, C: -40° to 60°

Installed height: _21_: 6.5” (16.5cm), _22_: 4.9” (12.4cm)

Pressure: AV13: 25 psi (1.7 bar), AU13 / AZ13: 150 psi (10 bar)

Enclosure rating: NEMA 4X (IP65)

Encl. material: -X21X: PP, UL94VO & PC, -X22X: PP, UL94VO

Conduit entrance: 1/2” NPT

Wetted material: AV13-42XX: PP, AV13-52XX: PVDF, AU13-42XX: PP, AU13-52XX: PVDF & PFA, AZ13-42XX: PP & Ryton®

Process mount: -X2X3: 2” NPT, -X2X7: 1-1/2” G

Classification: General purpose

Compliance: CE


If you want help in selecting a sensor for your application, please submit a Level Questionnaire. An engineer will review your requirements and suggest a product solution via email.