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SD21 Series Optical Level Switch
Brand: FineTek
The optical liquid level switch uses the principle of total reflection in a prism.
Reflection or penetration, is the basis of the level alarm output.
When the sensor is surrounded by air, the angle of incidence is greater than the critical angle and thus total reflection occurs.
Totally reflected light will be transmitted to the receiver.
Conversely, when the sensor is surrounded by liquid, due to the refractive index of the liquid and the sensor tip material, almost all light will penetrate the front of the sensor.
Using this principle, the optical liquid level switch design is based on light.
The receiver can detect and determine a light reflected or penetrated state, and determines the circuit output.
Features- Simple, compact, and robust
- No moving parts
- Built-in, solid-state electronics
- Easily removed, cleaned, and reinstalled
- NPN / PNP output selection can be connected to the relay or PLC
- This product provides both NO and NC output for selection
- Products made of glass and SUS 304/316, diesel fuel, waste water, aqueous solution, alcoholic solution
- Includes power polarity and over current protection
- LED indicates contact status
- There are general cloudy and turbidity for option
- You can measure turbid solutions
- Also output a delayed-type output can be selected
Specifications
Brand
Ambient Temperature Range
- -20° to 80° C (-4° to 176° F)
Approvals & Certifications
- CE
- UL (SA44153)
Cable Length
- 6.56 feet (2 metres)
Cable Material
- Silicone Rubber Jacket
Consumption
- Current Consumption: < 25 mA
Current
- Load Current: ≤ 200 mA
Delay Time
- 5 seconds (± 1 second)
Electrical Connectors
- Cable, 24 AWG
- M12 x 1
Electrical Contacts
- Normally Closed & Normally Open
Electrical Protection
- Reverse Polarity
- Short Circuit Protection
Enclosure, Body Material
- 304 Stainless Steel
- 316 Stainless Steel
Environmental Protection
- IP67
Indication
- Red LED
Materials of Construction
- Tip Material: Glass
Media
- Liquids
NPT Connection
- 1/2” NPT Male
- 3/8” NPT Male
Operating Pressure
- psi: 0 to 870.2 (kPa: 0 to 6,000, bar: 0 to 60)
Operating Temperature
- -20° to 100° C (-4° to 212° F)
PT/PF/PS (JIS) Connection
- 1/2” PF Male
- 1/2” PT Male
- 3/8” PF Male
- 3/8” PT Male
Sensor, Probe Style
- Optic
Supply Voltage
- 10-28 Vdc
Switch Type
- Output Mode: NPN/PNP
Torque
- 65.1 In/Lbs (75 kgf-Cm)
- Food & Beverage Systems
- Air Conditioning Systems
- Heavy Duty Automotive
- Hydraulic Reservoirs
- Industrial Compressors
- Pharmaceutical Systems
- Processing & Packaging Equipment