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OLS-C51 Optoelectronic Level Switch

Level switch is designed for medium temperatures up to +135 °C in zone 0 and 1

Have questions? We're here to help!
Have questions? We're here to help!

The model OLS-C51 optoelectronic level switch is used for monitoring the level of liquids. The optoelectronic sensor consists of an infrared LED and a light receptor.

The light from the LED is directed at a prism which forms the tip of the sensor. So long as the tip is not immersed in liquid, the light is reflected within the prism to the receiver.

When the liquid rises within the vessel and surrounds the tip, the light beam is refracted by the liquid, so that the receiver is no longer or only weakly reached by the light and reacts to this change by triggering a switching operation.

As an explosion-protected version, the model OLS-C51 level switch is designed for medium temperatures up to +135 °C in zone 0 and 1.

   
 

• Application at medium temperatures up to +135 °C
• Mounting position as required
• Accuracy ±2 mm
• Explosion-protected version Ex i

Measurement Accuracy±2 mm
Minimum distance from the glass tip to an opposite surface≥ 10 mm
(≥ 20 mm with polished surfaces)
Mounting PositionAs required
Process ConnectionG 1/2" male
ResponsivenessPreset for the detection of aqueous media and oils
Medium Temperature-30 … +135 °C
Ambient Temperature-30 … +80 °C
Operating Pressure40 bar (4.0 MPa)
MaterialsLight guide - Borosilicate glass, fixed with epoxy resin
Case - Stainless steel 1.4305 (non-wetted parts)
Process Connection - Stainless steel 1.4571
Power SupplyDC 7.5 ... 30 V
Safety-Related Maximum ValuesIo = 100 mA
Uo = 30 V
P = 1 W
Output4-20 mA, protected against reverse polarity
“Closed”: ≥ 4 mA to < 10 mA
“Open”: ≥ 12 mA to 18 mA
Fault: < 4 mA, > 20 mA
Electrical Connection- PUR cable halogen-free
- Cable length freely definable
- Diameter: 2 x 0.5 mm2
Output Function“Normally open” (closed in medium) or “normally closed” (open in medium)
Ingress ProtectionIP65
Number of Switch Points1

• Machine tools
• Hydraulics
• Plant construction and machine building
• Water technology
• For liquids such as oils, water, distilled water, aqueous media

  • Thumbnail of document DS LM3104 en co 59866 15442
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    DS LM3104 en co 59866 15442

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