Pressure Sensor | 4-20mA & RS485 Output | Water Gas Oil Transducer

This pressure sensor combines a sensor and a clear LCD screen. You get direct readings right where you need them. It's an LCD display pressure transmitter. It's made to watch liquids and gases. You see real-time data and get a steady signal for your control system. It's all in one device. Features and Benefits - Backlit LCD screen - You can check pressure readings right at the spot. This works even in dim light, without needing other gear. - Many signal outputs - Pick from 4-20mA, 0-5V, or RS485. This matches what your PLC, data logger, or control panel needs. - Stainless steel body and diaphragm - It resists rust when used with water, oil, and different gases. This helps it last a long time. - Wide measurement range - It works for both positive pressure and as a vacuum sensor. This covers many different uses. Applications - Checking water or air pressure in factory pipes and HVAC systems. - Looking at hydraulic fluid pressure in machines and equipment. - Using it in lab setups for vacuum chambers or gas pressure tests. Safety & Preparation Before installing or testing any pressure transducer, always ensure the power supply is disconnected. Pressure transducers, like this one with 4-20mA and RS485 output, convert physical pressure into an electrical signal. Understanding how pressure transducers work involves providing an excitation voltage and then measuring the resulting output. Take care when handling the unit to avoid damage. This pressure sensor is designed for measurement in water, gas, and oil. Check Excitation Voltage The correct excitation voltage is crucial for accurate operation of your pressure transducer. Refer to the transducer's documentation for the specified voltage range. Applying an incorrect voltage could damage the unit or lead to inaccurate readings. While the specific voltage for this pressure sensor is not listed, many transducers operate on common industrial voltages like 5V or 24V. Verify your power supply matches the transducer's requirements before connecting. Test Output Signal (Zero Pressure / No Load) To test a pressure transducer, first connect it to the appropriate power supply, ensuring no pressure is applied to the sensor. This "zero pressure" or "no load" condition allows you to check the baseline output signal. For a pressure sensor designed for negative or vacuum pressure, a no-load test helps confirm its basic functionality before installation in a system involving water, gas, or oil. This initial check helps confirm the transducer is working correctly. For Current Output Transducers (4–20 mA): For current output transducers, like the 4-20mA option on this pressure sensor, connect a multimeter in series with the power supply and the transducer. With no pressure applied, the multimeter should read approximately 4mA. As pressure increases (within the transducer's specified range), the current output should proportionally increase up to 20mA. This method verifies the transducer's ability to convert pressure into a measurable current signal for systems such as a logic controller. For Voltage Output Transducers (0–5V, 0–10V, or mV): If using the 0-5V or 0-10V output options, connect a multimeter in parallel across the output terminals of the pressure transducer. With no pressure applied, the multimeter should read close to 0V. As pressure is introduced to the measurement medium (water, gas, or oil), the voltage output should increase proportionally up to 5V or 10V, depending on the specific output configuration. This allows you to confirm the transducer's electrical response to applied pressure.