DFRobot Gravity GL-136 Industrial Stainless Steel Submersible Pressure Level Sensor (0-5m) - 4-20mA Output, 5m Cable, IP68

The GL-136 operates on a wide 12 to 36 Volts DC supply, which is standard for industrial 4-20mA two-wire loop-powered transmitters. This range ensures compatibility with common PLC power supplies and industrial DC sources without requiring an external signal conditioner for power.

To connect the 4-20mA output to a microcontroller's analog input, you must use a current-to-voltage converter, such as the module included in the package. This converter places a precision resistor in the loop, translating the 4-20mA signal into a proportional 0-3.3V or 5V analog voltage that can be read directly by the ADC pin of an Arduino, Raspberry Pi, or other logic device.

The sensor is constructed with 304 stainless steel housing and a 316L stainless steel diaphragm, offering excellent corrosion resistance. It is suitable for continuous submersion in water, oils, non-aggressive sewage, and many other industrial liquids. It is not recommended for use with highly concentrated acids, strong alkalis, or solvents that aggressively attack stainless steel.

The sensor provides a typical accuracy of ±0.5% of its full-scale range (5m). This high precision is maintained across its operating temperature range of -20°C to +70°C due to the integrated temperature compensation circuit built into the MEMS sensing chip, which minimizes thermal drift and ensures stable output.

Yes, the attached 5-meter cable can be spliced and extended using waterproof junction boxes and appropriate cabling. For optimal signal integrity, especially when extending over very long distances, use shielded cable and ensure all connections are sealed to maintain the IP68 rating. The 4-20mA current loop signal is inherently resistant to noise and voltage drop over long runs.