UNS-VA 1/4 NPT-K1-VA52 (Formerly BLS 1950 Series)

Barksdale_Level Switch_UNSVA Description
Barksdale's single-point float-type level switch provides a variety of solutions for your specific level control problems. UNS-VA 1/4 NPT-VA52 Level Switches are ideal for general level measurement in tanks or containers, and have a 2-1/16" diameter stainless steel float with 100 VA reed switch for high-current switching. These IP54-rated switches feature a large float displacement and are suitable for rugged service and use in high viscosity liquids. Switch polarity on all models can be changed from normally-open to normally-closed by simply rotating the float 180 degrees. For your level switching and control needs requiring only a single float, Barksdale's UNS Series Level Switches are the ideal solution.



  • Compact size for easy installation
  • Ideal for small tanks & vessels
  • Reversible switch logic
  • Broad media compatibility
  • All models incorporate hermetically sealed                       magnetically actuated reed switches


  • Sump tanks
  • Hydraulic power units
  • Storage tanks
  • Solvent recovery systems
  • Lube oil console systems


Switch Rating:
250 V AC/DC; 3.0 A / 100 VA/W
140 V AC/DC / 1.0 A / 60 VA/W
Switch Configuration: Shipped as normally open as standard. Can be changed to normally closed by rotating float 180°
Contact Mode*:
1 - SPST-switch (NO)
2 - SPST-switch (NC)
3 - SPDT-switch
Wetted Parts:
316 stainless steel (VA)
316 stainless steel (VA)
1/4" NPT male
Electrical Connection:
PVC-cable - max 3 x 0.34mm²
1m/3m/5m length
Minimum Specific Gravity:
Stainless Steel Float:
Protection Class: IP54
Operating Temperature:
Option/ High Temp:
14° to +220°F (-10° to +105°C), PVC-cable
40° to +302°F (-40° to +150°C), silicone cable (-HT), cable consult factory
Operating Pressure:
Stainless Steel Float:
580 psig (40 bar)
Weight: Approx. 150 grams (5.3 oz.)

*The contact modes (NO or NC) are defined on the basis of an empty tank and for a level switch mounted through the top.