TAKEX FL-7161 φ4 PFA Liquid Level Fiber Optic Sensor

• Slim φ4 sensing tip: The cylindrical φ4 sensing tip provides a compact liquid-level sensing head for installations requiring a smaller tip diameter.
• PFA chemical-resistant construction: The fiber covering uses PFA fluoropolymer for liquid level detection in water, oil, and a wide range of chemical liquids.
• Refractive liquid level sensing: The unit detects liquid contact through the optical change created by the difference in refractive index between air and liquid.
• 1 mm or less repeatability: Repeatability is 1 mm or less when detecting water, supporting stable liquid-level position detection.
• Pressure and temperature capability: The FL type supports −0.1 to +0.5 MPa pressure resistance and an ambient temperature range of −40 to +70°C.

Q1: What is the TAKEX FL-7161 Series?
A: FL-7161 Series consists of slim φ4 PFA-covered fiber optic units that use refractive sensing to detect liquid level by liquid contact.

Q2: Which models are included in the FL-7161 Series?
A: The lineup includes FL-7161, FL-7161-05, FL-7161-1, and FL-7161-2. All use a φ4 tip, 2.5 m fiber, and chemical-resistant PFA construction.

Q3: What liquids can FL-7161 detect?
A: It can detect water, oil, and a wide range of chemical liquids, including colored and colorless transparent liquids. Sample testing is recommended for highly viscous or turbid liquids.

Q4: How does FL-7161 detect liquid level?
A: It uses a refractive method that detects the optical change caused by the difference in refractive index between air and liquid.

Q5: What is the sensing tip size of FL-7161?
A: The series uses a φ4 cylindrical sensing tip for liquid-level detection.

Q6: What is the repeatability of FL-7161?
A: Repeatability is 1 mm or less when detecting water.

Q7: What are the pressure and temperature ratings of FL-7161?
A: Pressure resistance is −0.1 to +0.5 MPa, and the FL type operates from −40 to +70°C.

Q8: What are the fiber length and bending requirements?
A: All four current models use a 2.5 m fiber. The allowable bending radius is R40 mm, and the first 50 mm from the sensing tip must not be bent.

Q9: Does FL-7161 provide NPN or PNP output?
A: No. FL-7161 is a fiber optic sensing unit. Electrical output, including NPN or PNP, depends on the compatible TAKEX fiber amplifier used with it.

Q10: What applications are suitable for the FL-7161 Series?
A: It is suited to liquid-level and liquid-presence detection in tanks, analyzers, liquid supply systems, and process equipment requiring a slim φ4 tip and chemical-resistant PFA construction.