Introducing the AchieVe LPPT Series: AutomationDirect’s New Pressure Sensors

The AchieVe LPPT pressure sensors function by converting pressure into an electrical signal. Inside the transmitter is a pressure-sensing element, typically a diaphragm, that deforms when pressure is applied. The deformation of the diaphragm is detected by strain gauges attached to it.

An image of the AchieVe LPPT pressure sensor series. Image courtesy of AutomationDirect

These strain gauges vary their electrical resistance in response to the deformation. They are usually arranged in a Wheatstone bridge configuration, which converts the resistance changes into a small electrical signal. An internal amplifier then amplifies this small electrical signal to strengthen it for further processing. The amplified signal is converted into a standardized 4-20 mA current signal.

Key Features of the AchieVe LPPT Series

The LPPT sensors adhere to the industry standard for measuring pressure, utilizing a 4-20 mA analog output. If you need to become more familiar with how this output measures pressure, it's pretty simple. The relationship between the output in milliamperes is directly proportional to the supplied pressure. For instance, assuming pressure can be measured from 0-100 psi when the output amperage is at four mA, the pressure sensor reads zero pressure. Similarly, when the output amperage reaches 20 mA, the pressure sensor would indicate a pressure of 100 psi. If the amperage drops below four mA, it may indicate a fault, such as a sensor failure or a damaged wire.

This output standard makes programming within the PLC for the application extremely simple. It also offers a more reliable solution for electrical noise and interference, making the sensors consistent over long distances.

AutomationDirect has made the AchieVe LPPT pressure sensors adaptable to most industrial applications. The LPPT sensors can accurately measure pressures from 15 to 5000 PSIG (pounds per square inch gauge), which means they measure pressure relative to the surrounding atmospheric pressure. For instance, if a tire gauge reads 32 PSIG, the pressure inside of the tire is 32 pounds per square inch above the atmospheric pressure.

Image showing the dimensions of the pressure sensor. Image courtesy of Automation Direct

Application Uses and Durability

The LPPT sensor series is constructed with durable stainless steel, ensuring compatibility with various liquid and gas pressure sensing applications. The LPPT series sensors are also rated for 50 million cycles and feature an IP67 protection rating.

In the HVAC industry, pressure sensors monitor and control pressure. Utilizing pressure sensors within HVAC systems offers several benefits, including energy efficiency by accurately monitoring the pressure to optimize the operation of compressors and fans, leading to energy savings. Moreover, it protects the system by preventing overpressure conditions that could damage components, ensuring its longevity. Additionally, it contributes to comfort by maintaining consistent air pressure, thus creating a comfortable indoor environment.