Este projeto de pesquisa apresenta o desenvolvimento de protótipos de transmissores industriais de pressão do tipo diferencial piezoresistivo com saída analógica a dois fios 4-20 mA. Os dispositivos usam um DSSP (processador digital de sinal do sensor) para realizar compensação térmica nas temperaturas de 0°C até 80°C e a calibração de pressão diferencial na faixa de 0-25 bard e de pressão de linha de 0-7 barg. Os transmissores permitem a leitura de diversas variáveis industriais: pressão diferencial, pressão relativa e pressão absoluta em fluidos. Os transmissores têm um TEB (total error band) menor que 0,15 de porcentagem de escala plena. A saída analógica dos transmissores diferenciais de pressão é caracterizada utilizando como base normas internacionais BS (British Standards). Os parâmetros avaliados nos transmissores de pressão são: a exatidão, o coeficiente térmico do offset, o coeficiente térmico do span, o total error band, e os desvios no tempo a curto e longo prazo. Esse trabalho é resultado da parceria dada entre o Laboratório de Sistemas Integráveis da Escola Politécnica da Universidade de São Paulo (LSI/EPUSP) e a empresa MEMS Microssistemas Integrados Híbridos de Pressão. / This research project presents the prototypes development of piezoresistive differential pressure transmitters with analog two-wire output of 4-20 mA. The devices use a DSSP (Digital Signal Processor Sensor) to achieve temperature compensation at temperatures from 0°C to 80°C and differential pressure calibration range from 0 bard to 25 bard and line pressure range from 0 barg to 7 barg. The transmitters measure several industrial variables: differential pressure, relative pressure and absolute pressure at fluids. The transmitters have a TEB (total error band) less than 0.15 percent of full scale. The analog output of the differential pressure transmitters is characterized using British Standards-BS. The parameters evaluated in the pressure transmitters are: the accuracy, the thermal coefficient of the offset, the thermal coefficient of the span, the total error band, the start-up drift and long-term drift. This work is the result of the academic and technological partnership between the Laboratory of Integrated Systems of the Polytechnic School of the University of São Paulo (LSI / EPUSP) and the MEMS company - Microssistemas Integrados Híbridos de Pressão Ltda.

Este projeto de pesquisa apresenta o desenvolvimento de protótipos de transmissores industriais de pressão do tipo diferencial piezoresistivo com saída analógica a dois fios 4-20 mA. Os dispositivos usam um DSSP (processador digital de sinal do sensor) para realizar compensação térmica nas temperaturas de 0°C até 80°C e a calibração de pressão diferencial na faixa de 0-25 bard e de pressão de linha de 0-7 barg. Os transmissores permitem a leitura de diversas variáveis industriais: pressão diferencial, pressão relativa e pressão absoluta em fluidos. Os transmissores têm um TEB (total error band) menor que 0,15 de porcentagem de escala plena. A saída analógica dos transmissores diferenciais de pressão é caracterizada utilizando como base normas internacionais BS (British Standards). Os parâmetros avaliados nos transmissores de pressão são: a exatidão, o coeficiente térmico do offset, o coeficiente térmico do span, o total error band, e os desvios no tempo a curto e longo prazo. Esse trabalho é resultado da parceria dada entre o Laboratório de Sistemas Integráveis da Escola Politécnica da Universidade de São Paulo (LSI/EPUSP) e a empresa MEMS Microssistemas Integrados Híbridos de Pressão. / This research project presents the prototypes development of piezoresistive differential pressure transmitters with analog two-wire output of 4-20 mA. The devices use a DSSP (Digital Signal Processor Sensor) to achieve temperature compensation at temperatures from 0°C to 80°C and differential pressure calibration range from 0 bard to 25 bard and line pressure range from 0 barg to 7 barg. The transmitters measure several industrial variables: differential pressure, relative pressure and absolute pressure at fluids. The transmitters have a TEB (total error band) less than 0.15 percent of full scale. The analog output of the differential pressure transmitters is characterized using British Standards-BS. The parameters evaluated in the pressure transmitters are: the accuracy, the thermal coefficient of the offset, the thermal coefficient of the span, the total error band, the start-up drift and long-term drift. This work is the result of the academic and technological partnership between the Laboratory of Integrated Systems of the Polytechnic School of the University of São Paulo (LSI / EPUSP) and the MEMS company - Microssistemas Integrados Híbridos de Pressão Ltda.

AstraZeneca är ett medicinskt företag lokaliserat i Södertälje som har cirka 900 luftfilterboxar hos sin anläggning i Gärtuna. Dessa filterboxar kan vara opraktiska att hålla koll på eftersom de är utspridda uppe på vindarna, samt att det behövs bra framförhållning vid filterbyten eftersom vissa filter innehåller farliga ämnen. Filterboxar är utrustade med analoga tryckmätare vilket innebär att det kan bli omständigt för personalen att övervaka filtrets tryckfall. Målet med det här examensarbetet är att hitta en digital lösning som underlättar övervakningen av tryckfall över filter i realtid, samt informerar via sms eller mejl när det är dags att planera in filterbyte. Visionen är att det ska bli enklare att få en bild över luftfiltrets underhållsmässiga skick. Genom att jämföra olika produkter och delta i regelbundna möten med IT kunnig personal valdes en lämplig produkt. Projektet har arbetat metodiskt och strukturerat genom att följa projektmodellen projekt case där verktygen GANTT-schema, SWOT-analys, FMEA och maxiriskmetoden har använts. Projektet resulterade i användningen av digitala differentialtryckgivare som mäter tryckfallet över filter. Differentialtryckgivaren samlar data som sedan skickas via radiofrekvens till en Ethernet gateway som är trådad in till AstraZenecas segregerade nätverk så kallat FAB-net. Därefter förs datan från ethernet gatewayen till mjukvara. I mjukvaran kommer AstraZenecas filtergrupp kunna se över tryckfall hos de olika filtrena i filterboxarna. Detta kommer underlätta personalens arbete och eventuellt spara AstraZeneca tid och pengar. / AstraZeneca is a medical company located in Södertälje that has around 900 air filter boxes at its facility in Gärtuna. These filter boxes can be impractical to keep track of as they are scattered up in the attics and good foresight is needed for multiple filter changes as some filters contain harmful substances. Filter boxes are equipped with analog pressure gauges, which means that there is a lot of walking for the staff in order to monitor the filter's pressure drop. The goal of this thesis is to find a digital solution that can facilitate the monitoring of pressure drops across filters in real time and that also informs by text message or email when it is time to schedule a filter change. The vision is that it will be easier to get a digital image of the maintenance condition of the air filter. By comparing different products and participating in regular meetings with AstraZeneca's IT personnel, a suitable product was chosen. The project has worked methodically and structured by following the project model project case where tools such as GANTT chart, SWOT analysis, FMEA and maxirisk method have been used. The project resulted in the use of digital differential pressure sensors that measure the pressure drop across filters. The differential pressure sensor collects data which is then sent by radio frequency to an ethernet gateway which is wired into AstraZeneca's segregated network called FAB-net. The data is then transferred from the ethernet gateway to the software. AstraZeneca's filter group will be able to review the pressure drop of the various filters within the software, which will facilitate their way of working and potentially save AstraZeneca time and money.