Premium Flow/Level/Temperature Switch

  • Simple field adjustable thermal differential switch for mass flow, level, and/or temperature of liquids or gasses with time delay adjustable from 0 to 300 sec.
  • Wide operating temperature range -100°F to +850°F (-70°C to +458°C).
  • User configurable operating power 110VAC, 220VAC, or 24VDC.
  • Removable, plug in electronics.
  • Can be configured with 2 independent outputs, such as level or mass flow with temperature or two mass flow rates.
  • Level response time of .1 to 1 second on wetting, media dependent
  • Flow response time of .5 to 10 seconds, media dependent
  • Can be used for either gas or liquid applications including interface detection.
  • Self heating sensor design improves repeatability. No separate heater to fail or slow response time.
  • Two Year Workmanship Warranty



Thermal Differential, dual RTD sensors with no separate heater

Process Connection:
Standard 0.75 inch MNPT
Optionally 0.5 inch and larger MNPT and various other process connections such as sanitary and flanges

Insertion Length:
Standard 2.0 inch
Optionally 0.5 inch or greater

Operating Temperature Range:
Standard -100°F to 390°F (-70°C to +200°C)
Medium Temperature to +572°F (+300°C)
High Temperature to +850°F (+458°C)

Materials of Construction:
Standard 316L Series Stainless Steel
Optionally Hastelloy, Monel, Inconel and other exotic materials

Operating Pressure Range:
Standard to 3000 psia (207 bar)


Standard Field selectable 110VAC, 220VAC, or 24VDC at 3 watts (No heater power required) Optionally 24VAC

Operating Temperature Range:
Standard -40°F to +140°F (-40°C to +60°C)
Optionally Remote electronics for use in medium and high temperature environments

Independent primary relay DPDT and secondary relay SPDT, contacts rated at 5 amp, 250 VAC with fail safe capability; built in time delay 0 to 300 seconds for each channel.

Integral and automatic during power up.

Failure Alarm Option:
Continuous monitoring circuit to alarm should a failure condition of any sensor, component, wiring, or power occur. (Uses second channel of the VS5100)

Explosion proof; NEMA 3, 4, 4x,7, and 9; CSA, FM, UL


Operating Range:
Flow 0.01 to 5.0 fps in oil,2.5 fps in water and 0.1 to 500 fps in gases. Level change as small as .03 inch.
Temperature -70° C to +458° C +/- 1° C.

Response Time:
Media dependent 0.5 to 10 seconds.

Available Approvals:
CSA Class 1 Div. 1 Groups B,C,&D Class 2
Div. 1 E,F,&G with T4A Temp rating.