The intrinsically safe or general purpose level switch package provides high or low liquid level detection with one relay or reed switch output, and a compact junction box for wiring termination. 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, connected to a PLC or relay controller.


  • Rugged polypropylene or PVDF construction for use with corrosive liquids
  • Available in intrinsically safe and general purpose classifications
  • 60VA relay or 15VA dry contact switches selectable NO or NC via wiring
  • Offered in three sensing technologies for broad application coverage
  • Polypropylene enclosure rated NEMA 4X with swivel base for conduit alignment


P/N Description From
AU18-4243-A Ultrasonic, 1 relay, IS, PP, 2″ NPT $490.00
AU18-4247-A Ultrasonic, 1 relay, IS, PP, 1-1/2″ G $500.00
AU18-5243-A Ultrasonic, 1 relay, IS, PVDF, 2″ NPT $655.00
AU18-5247-A Ultrasonic, 1 relay, IS, PVDF, 1-1/2″ G $665.00
AV16-4243-A Buoyancy, 1 reed, GP, PP, 2″ NPT $325.00
AV16-4247-A Buoyancy, 1 reed, GP, PP, 1-1/2″ G $335.00
AV16-5243-A Buoyancy, 1 reed, GP, PVDF, 2″ NPT $490.00
AV16-5247-A Buoyancy, 1 reed, GP, PVDF, 1-1/2″ G $495.00
AZ18-4243-A Vibration, 1 relay, GP, PP, 2″ NPT $510.00
AZ18-4247-A Vibration, 1 relay, GP, PP, 1-1/2″ G $520.00


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: ± 20º vertical

Switch points: 1 (factory set)

Supply voltage: AV16: N/A, AU18: 12-36 VDC, AZ18: 12-30 VDC

Consumption: AV16: N/A, AU18 / AZ18: 25 mA maximum

Contact type: AV16: (1) SPDT reed, AU18 / AZ18: (1) SPST relay

Contact rating: AV16: 15 VA, 0.25A max., AU18 / AZ18: 60 VA, 1A max.

Contact output: Selectable NO / NC

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

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

Installed height: 3.6” (9.1cm) above tank process mount

Pressure: AV16: 25 psi (1.7 bar), AU18 / AZ18: 150 psi (10 bar)

Enclosure rating: NEMA 4X (IP65)

Enclosure mat.: PP, UL94VO

Terminal strip: 6-pole, socket

Conduit entrance: 1/2” NPT

Wetted material: AV16-224X: PP, AU18-224X: PP, AU18-524X: PVDF, AZ18-424X: PP-Ryton®

Process mount: -X243: 2” NPT, -X247: 1-1/2” G

Classification: AV16 / AZ18: general purpose, AU18: intrinsically safe (see LU10 data sheet for details)

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.