Hydrostatic Level Transmitter | Submersible Pressure Probe 4-20mA

This hydrostatic liquid level sensor measures fluid depth by sensing pressure at the tank or well bottom. It's a submersible sensor that gives continuous, real-time readings. It outputs 4-20mA or 0-10V for connecting to your control systems. Features and Benefits - 316L stainless steel probe - Resists corrosion. This makes it good for water, fuel, or some mild chemicals. - IP68 waterproof rating - The whole unit is fully submersible. It works reliably long-term in deep wells or reservoirs. - Multiple output options - Choose 4-20mA, 0-10V, or other signals. This matches your existing PLC or data logger. - Wide measurement ranges - It comes in ranges from 0-5m up to 0-500m. This covers shallow tanks or very deep boreholes. Applications - Monitoring water levels in deep wells and boreholes. - Gauging liquid volume in large industrial storage tanks. - Managing levels in water treatment plants and flood control systems. Safety & Preparation Before installing or testing your PT100 Sensor, ensure the power supply to the system is disconnected to prevent electrical hazards. This submersible liquid level probe is designed for water pressure systems. When handling, avoid bending or kinking the probe, especially near the sensor head, as this can affect accuracy. Always wear appropriate personal protective equipment, such as gloves, if there's a risk of contact with the liquid being monitored. Check the probe length options (0-5m, 0-10m, 0-15m, 0-50m) to ensure it is suitable for your application's measurement range (0-500m). Identify standard RTD Values An RTD (Resistance Temperature Detector) is a precision sensor that measures temperature by correlating resistance to temperature. For a PT100 sensor, "PT" indicates platinum, and "100" signifies that the sensor has a resistance of 100 ohms at 0°C. This is a fundamental characteristic for verifying its functionality. When checking an RTD sensor, you will be looking for this base resistance value and how it changes with temperature. This liquid level transmitter incorporates a hydrostatic pressure sensor, and while primarily for level, the PT100 aspect refers to its temperature sensing capability within the unit. How to Test by Wire Configuration Testing an RTD sensor, such as this PT100, involves measuring its resistance. The method varies slightly depending on the number of wires it uses. Always use a multimeter set to resistance (ohms) and ensure it has fresh batteries for accurate readings. Disconnect the sensor from any controller or power source before testing. The output signal of this product can be 4-20mA, 0-10V, or 0-3.3V, but for RTD testing, you are directly measuring resistance, not these output signals. A. 2-Wire RTD For a 2-wire RTD, simply connect the multimeter leads to the two wires of the sensor. The reading you get will include the resistance of the lead wires themselves, in addition to the sensor's resistance. While this method is straightforward, it is less accurate for long cable runs as the lead wire resistance can introduce significant errors. At 0°C, a functional PT100 should read approximately 100 ohms. Any significant deviation, such as an open circuit or a very low resistance, indicates a fault with the sensor. B. 3-Wire RTD (Most Common) A 3-wire RTD is the most common configuration and offers better accuracy by compensating for lead wire resistance. Typically, two wires are the same colour (often red) and one is different (often white). Connect the multimeter between the two identical coloured wires (e.g., the two red wires) to measure the sensor's resistance. Then, measure the resistance between one of the identical wires and the third wire (e.g., one red and the white). These two readings should be very close, with the second reading representing the lead wire resistance. Subtracting this from the first measurement gives a more accurate sensor resistance.