Compact, Durable, Easy to Use
With all stainless steel wetted materials, operating temperatures up to 500° F, and a switch rated for VDC and VAC operation, the series FS-400 float switch fits a wide range of applications in two standard configurations.
Compact Size From the top of the mounting threads, to the bottom of the stem, the FS-400 is less than 3.5" long, and the float is just over 2" wide.
Temperature Ranges The FS-400-S has an operating temperature range of -40° to 383° F (-40° to 195° C), and the FS-400-HT extends that range to -40° to 500° F (-40° to 260° C)!
User Reversible Operation FS-400 float switches come standard with Normally Open operation. The e-clip at the bottom of the stem is easily removed to change to orientation of the float, changing the switch operation to Normally Closed.
Common Model Configurations
All common model configurations can be purchased online, click the model number link below. Refer to Model Number Configurator on the datasheet for a full list of configuration options.
|Model Number||Model Description|
|FS-400-S-M1-M1-0.6-P0-24||Stainless Steel Stem and Float, Standard Temperature, 0.6 SG, 1/4" NPTM, 24" Wires|
|FS-400-HT-M1-M1-0.6-P0-24||Stainless Steel Stem and Float, High Temperature, 0.6 SG, 1/4" NPTM, 24" Wires|
|FS-400-S-M1-M1-0.6-P0-36||Stainless Still Stem and Float, Standard Temperature, 0.6 SG, 1/4" NPTM, 36" Wires|
|FS-400-HT-M1-M1-0.6-P0-36||Stainless Steel Stem and Float, High Temperature, 0.6 SG, 1/4" NPTM, 36" Wires|
|FS-400-S-M1-M1-0.6-P0-48||Stainless Steel Stem and Float, Standard Temperature, 0.6 SG, 1/4" NPTM, 48" Wires|
|FS-400-HT-M1-M1-0.6-P0-48||Stainless Steel Stem and Float, High Temperature, 0.6 SG, 1/4" NPTM, 48" Wires|
Customer Reversible Specific Gravity
200 psi (13.8 bar) - Standard
500 psi (34.5 bar) - High Temperature
Max Current (AC)
0.14 A @ 240 VAC
0.5 A @ 120 VAC
Max Current (DC)
0.2 A @ 120 VDC
0.5 A @ 24 VDC
Mount & Stem Materials
316L SS, 15-7 SS
3.44 in. - top of threads to bottom of stem
2.06 in. - float diameter
-40 to 383° F (-40 to 195° C) - Standard
-40 to 500° F (-40 to 260° C) - High Temp
New Vertical Float Switches from APG | FS-400 & FS-410