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WHITE PAPER PAGE 4 TE PRESSURE SENSORS /// WHITE PAPER The Importance of Pressure Sensors in HVACR Systems SENSING TECHNOLOGY — SIMPLE AND RELIABLE At the heart of every pressure transmitter is a pressure sensing element. The M3200 uses our Microfused TM technology to provide a simple and reliable robust pressure sensor. Manufactured from a solid piece of stainless steel, the part does not require any welds or O-rings that could come in contact with the pressure media. This makes it compatible with a wide range of fluids including most refrigerants in use today as well as those being proposed for future use. With no moving parts, the cycle life is essentially infinite. The element is robust and offers high over-pressure and burst resistant capability. These technology features result in a simple, elegant design that is suited for harsh industrial applications used in HVACR systems. OUTPUT OPTIONS INCLUDE DIGITAL Most industrial pressure sensors use analog output signals, which are easy for customers to implement and are commonly used in the industry. The M3200 is available with a variety of common analog outputs including mV, 0-5V, 0-10V and 4-20mA. With an eye to the future, we also offer the M3200 with an I2C digital output. Digital sensors are becoming more pervasive in the industry. With benefits including easier integration into systems and very low power operation, they are suited for wireless and IoT designs as well as many of the new development systems being used today. TE is one of only a handful of manufacturers which offers a digital output in a fully ruggedized industrial pressure sensor. The main advantage of a digital output is that it can be read directly by a microprocessor without the additional cost and complexity of an A-to-D converter. Additionally, a digital output has the full resolution and accuracy with no signal degradation or loss of accuracy with the additional conversion circuitry. For more information, see our product data sheet. ASIC COMPENSATION — ACCURATE AND FLEXIBLE Pressure sensing elements require correction, or compensation, so that they can provide an accurate reading over a wide range of pressures and temperatures. For the M3200, we employ an ASIC-based solution. This uses a digital circuit to correct the raw pressure signal at multiple points in the operating range. Correction coefficients are stored in onboard memory, simplifying manufacturing and producing a very accurate product.

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