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1/4" Optical Liquid Sensor

Optical Liquid Level Sensor


Item# LV171

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 $136.87
10-24 $130.03
25-49 $127.29
50-99 $121.81
100-199 $119.08
200+ $116.34

In stock

Lead Time ( If not in Stock): 2 weeks

Optical Liquid Level Sensor LV171 LV171
  • Compact—Fits Interstitial Spaces
  • Unaffected by Vapors Even at High Concentrations
  • Easily Removed, Cleaned and Reinstalled
  • No Moving Parts

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Media Type
Max Operating Pressure
Max Process Temperature
Wetted Materials
Process Connection Type
Process Connection Size

Product Specs

  • Cable Material 3-conductor PVC jacketed
  • Maximum Ambient Temperature 80 {C} (176 {F})
  • Maximum Power Consumption Approximately 18 mA
  • Minimum Ambient Temperature -17.8 {C} (0 {F})

The LV170 optical liquid sensor accurately detects the presence of liquid in fiberglass double-wall tanks, containment sumps and double-wall pipes. Built-in electronic switching ensures dependability throughout its long service life. This reusable sensor easily fits small, interstitial spaces and senses liquid hydrocarbons or water. The unit is unaffected by hydrocarbon vapors, thereby greatly reducing the risk of false alarms. The LV170 sensor for level measurement is easy to remove, clean and reinstall after an alarm condition is triggered, or for maintenance. The LV170 electro-optical sensor contains an infrared LED and a light receiver. Continuous light from the LED is directed into a prism which forms the tip of the sensor. With no liquid present, light from the LED is reflected within the prism to the receiver. When rising liquid immerses the prism, the light is refracted out into the liquid, leaving little or no light to reach the receiver. Sensing this change, the receiver actuates electronic switching within the unit to operate an external alarm or control circuit.

Rated 5 out of 5 by from Small, light, simple, Div 2 and economical. I deal with Div 2 locations and most electronics start at $300 and up. Of coarse if you add the Zenier diodes it adds to cost. I used this unit in an unclassified area and was impressed with its size and function. I purchsed one for liquid. I could not activate by sheliding by hand I had to dip it in water for the signal to bounce back. Worked as described.
Date published: 2017-07-21
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