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SD20 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 open collector output to energize relay or PLC
- Housing material of PC, PES, SUS304, SUS316 for applicable in water, oil, liquid solution, liquor, alcohol, organic solvent etc.
- PC, PES for acidity and alkaline
- Over-current and reverse polarity protected
- LED status indication
Specifications
Brand
Ambient Temperature Range
- -10° to 80° C (-15° to 175° F)
Approvals & Certifications
- CE
- UL (SA44153)
BSP Connection
- G 1/2” Male
Cable Length
- 6.56 feet (2 metres)
Cable Material
- PVC
Consumption
- Current Consumption: < 15 mA
Current
- Load Current: ≤ 100 mA
Electrical Connectors
- Cable, 24 AWG
- M12 x 1
Electrical Contacts
- Normally Closed or Normally Open
Electrical Protection
- Reverse Polarity
- Short Circuit Protection
Enclosure, Body Material
- 304 Stainless Steel
- 316 Stainless Steel
- Polycarbonate (PC)
- Polyethersulfone (PES)
Environmental Protection
- IP67
Indication
- Red LED
Materials of Construction
- Tip Material: Polycarbonate (PC)
- Tip Material: Polyethersulfone (PES)
Media
- Liquids
Metric Connection
- M12 x 1 Male
NPT Connection
- 3/8” NPT Male
Operating Temperature
- -10° to 125° C (14° to 257° F)
Pressure Range
- psi: 0 to 145 (kPa: 0 to 1,000, bar: 0 to 10) for PC/PES
- psi: 0 to 580 (kPa: 0 to 4,000, bar: 0 to 40) for 304/316 Stainless Steel
PT/PF/PS (JIS) Connection
- 3/8” PF Male
- 3/8” PT Male
Sensor, Probe Style
- Optic
Supply Voltage
- 10-28 Vdc
Switch Type
- Output Mode: NPN/PNP
Torque
- 43.4 In/Lbs (50 kgf-Cm) for PC/PES
- 86.8 In/Lbs (100 kgf-Cm) for 304/316 Stainless Steel
- Air Conditioning Systems
- Food & Beverage Systems
- Heavy Duty Automotive
- Industrial Compressors
- Pharmaceutical Systems
- Processing & Packaging Equipment