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Liquid Level Sensor

Level and Temperature 4000 series


Uniquely monitors fluid level and temperature in a single control assembly.



Field adjustable level switch


Rugged solid cellular or stainless float


Some models fit through 1" npt 


Temperature switch 1°C repeatability, 5°C accuracy


Up to 15 ampere heavy duty switch


bullet Connectors
bullet Custom lead wires
bullet Custom molding
bullet Female threads
bullet Jacketed cable
bullet Metric-British threads
bullet NBR floats
bullet Stilling well
bullet Thermistors, RTD’s, Thermocouples

A.C.T. will modify switches to provide the
best solution for your application.

Ordering Information:

Select a "Base switch Part Number", then specify a temperature switch set point (5°C - 140°C) and operation (open = "C" or close = "CR" on rising temperature) finally select the float switch operation (N.O. or N.C. with the float resting against the retaining ring).

A common hydraulic reservoir switch is "B 4030 N - 60 - CR - N.C." The temperature switch is open and will close (CR) on rising temperature at 60°C (140°F), and the liquid level switch is closed with the float against the retaining ring. If this float switch was mounted from the top of the tank the liquid level switch would be closed with an empty tank.

Float Switch Qty. in
Stem Float Diameter Specific Gravity in water Rating
in. (mm)
Select a part number, and enter the quantity
  B 4030 N Brass Nylon 1-3/16" 30.2 .68 100 N.O. & N.C. 116
B 4032 N Brass Nylon 1-1/8" 28.6 .73 100 N.O. & N.C. 19
B 4060 N Brass Nylon 1-3/16" 30.2 .68 5 amp N.O. & N.C. 38
B 4030 N Brass Nylon 1-3/16" 30.2 .68 100 N.O. & N.C. 116
S 4030 S SS SS 1-5/8" 41.3 .60 100 N.O. & N.C. 12

SS = Stainless Steel

Quantities greater than 10 qualify for quantity discounts.

Select additional options below.  
Options will change the price of each unit and some options are not carried in stock.  If you add options, we will call to confirm the price and availability with you. 

Please Select Any Additional Options:

Stem Material

Switch Type

Liquid Level Switch

Float Size

Float Material
Temperature Switch Set Point
Temperature Switch Operation
Liquid Level Switch Operation 
Elevated operating temperature
Extra wire length, 24"standard (Total length, example 36")
Female threads
Jacketed cable
Special Threads (by description)
Stilling well
Thermistor, by description
U.L. recognized
Wiring size, 22 gauge (18 gauge standard)
Wiring, 2 wire switches wired in series 
Wiring, 4 wire, individually wired switches