IMS use its high performance optical sensor ASIC to make compact and low cost optical liquid level sensor. 

Performance:

• High performance ASIC based compact sensor
• Build in 100ms power on delay eliminate false trigger when power up
• Self-recover short circuit protection on NPN/PNP output, reverse polarity and over voltage protection on sensor power supply
• Self-recover short circuit, reverse polarity, over voltage protection
• 1mm liquid level detecting precision 
• Temperature range: -20~55? or - 40°C~100°C
• Highly chemical resistance material: Polysulfone or Trogamid 
• Water Proof IP67
• Light on or dark on switchable