High accuracy. Strong anti-interference capability. Excellent long-term stability. No user calibration required. Lifespan 5 years. Passed EMC testing. Precautions for use: that the gas being tested is free of water, oil, and dust. Installation Location: Gas Tank - Pressure Regulator - Float Flowmeter/Electronic Flowmeter/Control Knob - Sensor - Check Valve - Humidifier. Gas Concentration Detection Range: 21%-95.6% (Other concentrations available on request). Concentration Resolution: 0.001 Concentration Detection Accuracy: 1.5% @ (5-55)C. Gas Flow Detection Range: 0-10 L/min (0-20 L/min). Flow Resolution: 0.1 L/min. Flow Detection Accuracy: 0.2 L/min or 5% of reading (whichever is greater) @ (5-55)C. Sample Gas Requirements: Water-free (non-condensing); Dust-free (Less than 1 m) Detection Cycle: 1 second. Warm-up Time: Ready to measure upon power-up, reaches basic accuracy in 10 seconds. Digital Output: 9600 bps UART: 5V TTL / 3.3V CMOS Analog Output: 0-2.5V (Optio Green: Oxygen concentration 82% LED Output: Yellow: 82% Oxygen concentration 50%, Red: 50% Oxygen concentration (Can be set separately) Air Inlet and Outlet Direction: Follow the arrows Operating Temperature: 5C to 55C Storage Temperature: -5C to 65C Relative Humidity: 5% to 85% RH Maximum Pressure: 150 kPa Power Supply: DC 6.5-12V, 50mA Dimensions: 120.5mm x 22mm x 22mm (L x W x H) Center screw length can be customized Sensor Weight: 25g Communication Protocol Baud Rate: 9600bps Character Length: 1 bit, 8 data bits, 1 stop bit, no parity Communication Instructions 1. All data in this protocol is in hexadecimal. For example, "46" is decimal [70] 2. The protocol check must include 0x16 0x09 0x01 and the bit. Only after the check is passed can the data be correct and used normally. 3. The sensor reports data twice per second by default. When the mainboard queries, the sensor automatically switches to the response mode and reports data according to the mainboard query, and no longer reports data twice per second. Color: Blue & Black Material: PCB Package Contents: 1 * Ultrasonic Oxygen Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.