The general purpose level switch package provides automatic tank filling or emptying up to 10’ (3m) between two adjustable level switch points. The compact relay controller with optional strobe provides one latching 16A relay for pump or valve control. Offered in three sensor technologies, choose the type based upon your application media. This PP level switch package is selected for day tank, skid or machine, cooling tower, waste sump and process tank applications, requiring detection and control.


  • Fail-safe relay control of pumps or valves with adjustable time delay
  • Offered in three sensor technologies for broad application coverage
  • Easy setup with LED indicators for sensor, power and relay status
  • Rugged polypropylene construction for use with corrosive liquids
  • Adjustable switch cars enable sensor position adjustments in the field
  • Invert switch changes relay state from NO to NC without rewiring


P/N Description From
AU23-4313-A-B-C Ultrasonic, PP, 2″ NPT $1,015.00
AU23-4317-A-B-C Ultrasonic, PP, 2″ G $1,015.00
AU23-4323-A-B-C Ultrasonic, w/strobe, PP, 2″ NPT $1,065.00
AU23-4327-A-B-C Ultrasonic, w/strobe, PP, 2″ G $1,075.00
AV23-4313-A-B-C Buoyancy, PP, 2″ NPT $685.00
AV23-4317-A-B-C Buoyancy, PP, 2″ G $685.00
AV23-4323-A-B-C Buoyancy, w/strobe, PP, 2″ NPT $735.00
AV23-4327-A-B-C Buoyancy, w/strobe, PP, 2″ G $735.00
AZ23-4313-A-B-C Vibration, PP, 2″ NPT $1,055.00
AZ23-4317-A-B-C Vibration, PP, 2″ G $1,055.00
AZ23-4323-A-B-C Vibration, w/strobe, PP, 2″ NPT $1,105.00
AZ23-4327-A-B-C Vibration, w/strobe, PP, 2″ G $1,105.00


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: 8” to 10’ (20cm to 3m)

Accuracy: ± 1mm in water

Repeatability: ± 0.5mm in water

Orientation: ± 20° vertical

Switch points: 2 (field adjustable)

LED indication: Power, relay & sensor

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

Consumption: 0.25A maximum

Strobe type: -431X: N/A, -432X: Xenon tube

Strobe flash: -431X: N/A, -432X: 1 per second

Contact type: (1) SPDT relay, latching

Contact rating: 250 VAC @ 10A

Contact output: Selectable NO / NC

Contact delay: 0.15 – 60 seconds

Contact latch: Selectable ON / OFF

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

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

Installed height: -431_: 5.7” (14.4 cm), -432_: 7.4” (18.8 cm)

Pressure: Atmospheric

Enclosure rating: NEMA 4X (IP65)

Enclosure mat.: -432X: PP, UL94VO & PC, -431X: PP, UL94VO

Conduit entrance: 1/2” NPT

Wetted material: PP (20% glass fill)

Process mount: 2” NPT (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.