Offered in liquid and gas sensor types, the general purpose flow switch package provides reliable no or low-flow detection of relatively clean non-coating media with a 1A relay output and compact junction box for wiring termination. Liquid examples includes water and acetic acid. Available in PP-Ryton® and PVDF, the short flow sensor is used in pipe or ducting from 1/2” to 1 1/2”, and the long flow sensor is used in 2” and up. The flow switch set point may be adjusted from 0.04 to 3 fps in liquids, or 1 to 90 fps in gases as a low-flow alarm. The flow sensor is best applied in applications with relatively constant temperature.


  • Rugged PP-Ryton® or PVDF sensor for corrosive liquids and gases
  • Adjustable set point with LED for flow or no-flow status indication
  • PP enclosure rated NEMA 4X with swivel base and terminal strip
  • 60VA relay selectable NO or NC via power supply wiring polarity
  • Solid state sensor is not damaged by over-ranging flow velocities


P/N Description From
AT17-1630 Liquid, short, PP, 3/4″ NPT $365.00
AT17-1634 Liquid, short, PP, 3/4″ G $370.00
AT17-3630 Liquid, short, PVDF, 3/4″ NPT $490.00
AT17-3634 Liquid, short, PVDF, 3/4″ G $495.00
AT18-1630 Liquid, long, PP, 3/4″ NPT $375.00
AT18-1634 Liquid, long, PP, 3/4″ G $380.00
AT18-3630 Liquid, long, PVDF, 3/4″ NPT $500.00
AT18-3634 Liquid, long, PVDF, 3/4″ G $505.00
AG17-1630 Gas, short, PP, 3/4″ NPT $375.00
AG17-1634 Gas, short, PP, 3/4″ G $380.00
AG17-3630 Gas, short, PVDF, 3/4″ NPT $500.00
AG17-3634 Gas, short, PVDF, 3/4″ G $505.00
AG18-1630 Gas, long, PP, 3/4″ NPT $385.00
AG18-1634 Gas, long, PP, 3/4″ G $390.00
AG18-3630 Gas, long, PVDF, 3/4″ NPT $510.00
AG18-3634 Gas, long, PVDF, 3/4″ G $515.00



Set point range: AT1X: 0.04 to 3 fps (0.012 to 0.91 mps), AG1X: 1 to 90 fps (0.3 to 27 mps)

Factory set point: AT1_: .2 fps (.06 mps), AG1_: 10 fps (3mps)

Repeatability: ±0.5% of set point @ fixed temperature

Response time: 1-10 seconds

Set point adjust.: Potentiometer

Viscosity range: AT1_: 1-200 centipoise, AG1_: N/A

LED indication: Flow status

Supply voltage: 14-36 VDC

Consumption: 70 mA maximum

Contact type: (1) SPST relay

Contact rating: 60 VA, 1A maximum

Contact output: Selectable NO / NC

Process temp.: F: 32° to 140°, C: 0° to 60°

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

Pressure: 150 psi (10 bar) @ 25º C, derated @ 1.667 psi (0.113 bar) per ºC above 25º C

Enclosure rating: NEMA 4X (IP65)

Enclosure mat.: PP, UL94VO

Terminal strip: 6-pole, socket

Conduit entrance: 1/2” NPT

Wetted material: -163X: PP-Ryton®, -363X: PVDF

Process mount: 3/4” NPT (3/4” G)

Mount gasket: Viton® (G version only)

Classification: General purpose

Compliance: CE