Vertical Float Switch
Stainless Steel Vertical Float Switch FS-400
Stainless Steel Vertical Float Switch FS-400
Stainless Steel Vertical Float Switch FS-400
Stainless Steel Vertical Float Switch FS-400
Stainless Steel Vertical Float Switch
Stainless Steel Vertical Float Switch GIF
Vertical Float Switch
Stainless Steel Vertical Float Switch FS-400
Stainless Steel Vertical Float Switch FS-400
Stainless Steel Vertical Float Switch FS-400
Stainless Steel Vertical Float Switch FS-400
Stainless Steel Vertical Float Switch
Stainless Steel Vertical Float Switch GIF

Stainless Steel Vertical Float Switch

FS-400

Vertical Stainless Steel Float Switch

The FS-400 Stainless Steel Vertical Float Switch is compact, durable, and built for high-performance liquid level sensing. Designed with 316L stainless steel wetted materials, it operates in extreme temperatures up to 500°F and withstands pressures up to 500 psi. With a 100W switch rating, it is ideal for industrial applications, including hazardous locations, food and beverage, chemical processing, and wastewater treatment. The user-reversible operation allows for Normally Open (NO) or Normally Closed (NC) configurations. The FS-400-S model is CSA explosion-proof certified, while the FS-400-HT model is certified for general use. All FS-400 switches carry NSF 169 certification for food and beverage applications.

  • Compact Design: Less than 3.5” long with a 2” wide float
  • Wide Temperature Range: Standard (-40° to 368°F), High Temp (-40° to 500°F)
  • High Pressure Tolerance: Rated up to 500 psi (HT model)
  • User-Reversible Operation: Easily switch between NO and NC modes
  • Durable 316L Stainless Steel: Corrosion-resistant for harsh environments
  • Certified for Safety: CSA explosion-proof (FS-400-S), NSF 169 (all models)

ⓘ
  • Pressure Rating:
    • FS-400-S: 200 psi (13.8 bar)
    • FS-400-HT: 500 psi (34.5 bar)
  • Maximum S.G.: 0.6
  • N.O. Actuation: 0.220” ± 0.05” (5.59 mm ± 1.27 mm)
  • N.C. Actuation: 0.160” ± 0.05” (4.06 mm ± 1.27mm)
  • Hysteresis: 0.070” ± 0.02” (1.78 mm ± .51 mm)
  • Operating Temp.:
    • FS-400-S: -40º to 368ºF (-40º to 187ºC)
    • FS-400-HT: -40º to 500ºF (-40º to 260ºC)
  • Liquids: Chemicals, Food, Potable Water
  • Switch Rating:
    • Max Capacity: 100 W (resistive load only)
    • Max Current (AC, 50/60 Hz): 240 VAC: 0.416 A; 120 VAC: 0.833 A; ≤ 100 VAC: 1 A
    • Max Current (DC): 120 VDC: 0.833 A; ≤ 100 VDC: 1 A
    • Life Expectancy: 10^6 – 10^8 (# of actuations; dependent on electrical load)
  • Lead Wires: #22 AWG, PTFE 24 – 99 in. (610 – 2515 mm)
  • Material:
    • Stem: 316L SS
    • Float: 316L SS
    • Retainer: 316L SS
  • Mounting: Vertical
  • CSA/cCSAus Contract #237484:
    • FS-400-S:
      • Explosion Proof
      • Class I, Div 1 & 2, Groups A, B,C, & D, T3
      • Class II, Div. 1, Groups E, F, T200°C
      • Class II, Div. 2, Groups F, G, T200°C
      • Class III
      • Ta -40° C to 187° C
    • FS-400-HT: General Use
    • Single Seal
  • NSF 169: Yes
  • Enclosure Rating: NEMA 4X
What is the FS-400 Stainless Steel Vertical Float Switch used for?

The FS-400 is designed for liquid level sensing in industrial applications, including hazardous locations, food and beverage processing, chemical processing, and wastewater treatment.

It is constructed with 316L stainless steel, providing excellent corrosion resistance and durability in extreme temperatures and high-pressure environments.

  • The FS-400-S model is CSA explosion-proof certified, making it suitable for hazardous locations.
  • The FS-400-HT model is built for high-temperature applications (up to 500°F) and is certified for general use.

Yes, all FS-400 models carry NSF 169 certification, ensuring compliance with food and beverage industry standards.

No, the FS-400 is a mechanical float switch and does not require calibration. However, proper installation and configuration are necessary for optimal performance.

CERTIFICATION

CSA – General, Explosion Proof, NSF 169
SWITCH POINTS

NO/NC Switch
SWITCH TYPE

Stem Mounted
ENCLOSURE PROTECTION

NEMA 4X
INDUSTRY

Chemical, Food & Beverage, Industrial Automation, Oil & Gas, Water & Wastewater

WARRANTY

APG warrants its products to be free from defects in material and workmanship under normal use and service of the product for 24 months from the date of shipment from APG, unless otherwise specified by APG in writing. Read our full warranty policy HERE.

RETURNS

Returns and allowances must be authorized by APG in advance, which authorization may be granted or withheld by APG in APG’s sole and absolute discretion. Read our full return policy HERE.

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