Intended for side wall installation, the general purpose level switch package provides reliable liquid level detection with one 1A relay and a compact junction box for integral wiring termination. Available in two level sensor technologies, select the type and material based upon your application media. This liquid level switch package is widely applied in bulk storage and process tank level applications as a high level alarm or low level alarm.


  • Rugged PP-Ryton® or PFA sensor for corrosive liquid applications
  • 60VA relay selectable NO or NC via power supply wiring polarity
  • PP enclosure rated NEMA 4X with swivel base and terminal strip
  • Offered in two sensing technologies for broad application coverage


P/N Description From
AU18-1130 Ultrasonic, SPST relay, PP, 3/4″ NPT $635.00
AU18-1134 Ultrasonic, SPST relay, PP, 3/4″ G $665.00
AU18-2130 Ultrasonic, SPST relay, PFA, 3/4″ NPT $815.00
AU18-2134 Ultrasonic, SPST relay, PFA, 3/4″ G $865.00
AZ18-1130 Vibration, SPST relay, PP, 3/4″ NPT $655.00
AZ18-1134 Vibration, SPST relay, PP, 3/4″ G $685.00


Select ultrasonic for chemicals and light weight oils or vibration for wastewater with light coating or scaling.



Accuracy: ± 1mm in water

Repeatability: ± 0.5mm in water

Supply voltage: AZ18: 12-30 VDC, AU18: 12-36 VDC

Consumption: 25 mA maximum

Contact type: (1) SPST relay

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

Contact output: Selectable NO / NC

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

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

Pressure: 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: AZ18-113X: PP-Ryton®, AU18-113X: PP, AU18-213X: PFA

Process mount: 3/4” NPT (3/4” G)

Mount. gasket: Viton®

Classification: General purpose

Compliance: CE