Series OLS Optitrol® Optical Level Switch

Low Cost, Compact, LED Indication, No Moving Parts

The Series OLS Optical Level Switches are a low cost, rugged optical level switch that indicates the presence or absence of liquid via infrared light that is reflected back through the prism lens. It also provides rapid response while employing no moving parts for stable process control. The bright red and green LED’s indicate the presence or absence of liquid for true, local indication. Three optional materials, 316 SS, polysulfone and PFA provide application flexibility. Compact switch can be quickly mounted horizontally or vertically for each installation.

PRINCIPLES OF OPERATION
The optical level switch employs an LED, which transmits infrared light. This light is sent through a prism and reflected back to a photo-transistor utilizing two 90° light reflections. With the prism surrounded by a gas, the light source is cast back to the photo-transistor. When a translucent liquid is introduced to the prism at or above the point where the light source makes contact with the prism, the light is reflected into the liquid, not allowing the photo-transistor to energize.

Product Applications

Food and beverage systems
Liquid holding tanks
Hydraulic reservoirs
Sumps
Pharmaceutical systems
Air conditioning systems

Starting at $104.25

Ordering

Grouped product items
Model	Description	Availability*	Price
OLS-10	Optical level switch, 316 SS/Polysulfone wetted materials.	1-3 days*	$189.90
OLS-11	Optical level switch, Polysulfone wetted materials.	1-3 days*	$104.25
OLS-12	Optical level switch, PFA wetted materials.	1-2 Weeks*	$230.15

Specifications

Service:: Noncoating compatible liquids.
Wetted Materials:: See chart on Catalog page.
Temperature Limits:: Process: OLS-10, 11: 200°F (93.3°C), OLS-12: 120°F (48.9°C); Ambient: OLS-10, 11: 175°F (79.4°C), OLS-12: 120°F (48.9°C).
Pressure Limit:: OLS-11, 12: 200 psig (13.8 bar); OLS-10: 1000 psig (69 bar).
Repeatability:: ±0.02"; (0.5 mm)
Switch Type:: NPN open collector.
Power Requirements:: 10 to 28 VDC.
Output Signal:: Vout (max.) = 28 VDC, Isink (max.) = 100 mA.
Current Consumption:: 35 mA max.
Electrical Connections:: 38" (965.2 mm) 3 conductor cable, 22 AWG wire.
Process Connection:: 1/2" male NPT.
Mounting Orientation:: Horizontal or up to 45° from horizontal.
Specific Gravity:: No minimum.
Weight:: 3 oz (0.085 kg).

Features

Compact switch can be quickly mounted horizontally or vertically for each installation
Bright red and green LED’s indicate the presence or absence of liquid for true, local indication
Provides rapid response while employing no moving parts for stable process control
Three optional materials, 316 SS, polysulfone and PFA provide application flexibility

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