The Optomax is an optical liquid level sensor that detects the presence or absence of almost any liquid — oil or water based. Inside the polysulfone housing, an infrared LED and matching phototransistor work together: when dry, the IR light reflects internally back to the sensor; when the tip is immersed in liquid, the light escapes and the output switches.

The sensor provides a push-pull digital output capable of sinking or sourcing up to 100 mA, allowing it to directly drive small loads like transistors or relays. It operates on 4.5–15.4 V DC and is insensitive to ambient light, foam (when in air), and small bubbles (when in liquid).

Key Features

• Optical Sensing – No moving parts for reliable, maintenance-free operation
• Push-Pull Output – Sinks or sources up to 100 mA for direct load driving
• Wide Supply Range – 4.5–15.4 V DC with reverse polarity, ESD, and transient protection
• Chemical Resistant Housing – Polysulfone construction for use with a wide range of fluids
• Compact Form Factor – Suitable for space-constrained installations
• Leak Detection Capable – Sensitive enough to detect small amounts of liquid when positioned correctly
• Fast Response – Repeatable switching point with optional output delays for sloshing applications

Wiring

• Blue/Black Wire – Ground
• Red Wire – Supply voltage (4.5–15.4 V DC)
• Output – Supply voltage when dry, 0 V when wet

Specifications

• Output Type – Push-pull, up to 100 mA sink/source
• Supply Voltage – 4.5–15.4 V DC
• Housing Material – Polysulfone (chemically resistant)
• Operating Temperature – −25 °C to 80 °C
• Detection – Oil and water-based liquids

Package Contents

• 1× Optomax digital liquid level sensor