Panasonic Flow sensor BE-A401P BE-A401P Operating voltage (range): 5 - 24 V DC 1 pc(s)
Optical sensor detecting fuid level and air bubbles. Detects 0.8 mm air bubbles and air gaps reliably. Suitable for clear tubes and pipes. Clip-fits on tubes Can be fitted in any orientation. Notch marks measuring point. Compact design: 20 x 15.5 x 16.5 mm. Output status indicator (Orange LEDs) Two mounting holes (ΓΈ3.5mm). Use: fluid level detection, air bubble detection, fluid level monitoring, fluid level indicators
Price: 134.99 from Conrad Electronic