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This paper describes a low cost electrochemical sensor module for gas concentration measurement. A module is universal and can be used for many types of electrochemical gas sensors. Device is based on AVR ATmega8 microcontroller. As signal processing circuit a specialized integrated circuit LMP91000 is used. The proposed equipment will be used as a...
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Citations
... Ten custom-designed electronic modules forming the measuring system were used for sensor response acquisition. More details of the developed systems were presented elsewhere [21,22]. The sensor response was measured by custom-written PC software once per minute and saved to a text file. ...
In recent years, smog and poor air quality have become a growing environmental problem. There is a need to continuously monitor the quality of the air. The lack of selectivity is one of the most important problems limiting the use of gas sensors for this purpose. In this study, the selectivity of six amperometric gas sensors is investigated. First, the sensors were calibrated in order to find a correlation between the concentration level and sensor output. Afterwards, the responses of each sensor to single or multicomponent gas mixtures with concentrations from 50 ppb to 1 ppm were measured. The sensors were studied under controlled conditions, a constant gas flow rate of 100 mL/min and 50 % relative humidity. Single Gas Sensor Response Interpretation, Multiple Linear Regression, and Artificial Neural Network algorithms were used to predict the concentrations of SO2 and NO2. The main goal was to study different interactions between sensors and gases in multicomponent gas mixtures and show that it is insufficient to calibrate sensors in only a single gas.
... This is not excluding the fact that reliable measurement is often difficult to obtain in harsher environment, or even in predictable environment with faster dynamic of observed variables [4]. With the need of a more reliable sensor sustainability and lower energy consumption, the trend in gas sensor has been shifting towards the electrochemical sensor-type [5]. Without the need of extra heating, the electrochemical sensor can be utilised in a long range of temperatures, spanning from -30 to 1600 ºC [6]. ...
Environmental monitoring has been one of the key to provide better safety measure in various sectors of life. The most famously featured technology in this area is the gas detecting system. It serves not only in an early-warning application, but also a continuous mean to provide background check of the atmospheric status of a specific area ranges. According to their principals, gas sensors can be separated into two categories; the conductive metal-oxides and the electrochemical-type, with the latter gaining more recognition over the last decade as the future standard component in any gas sensing apparatus. Within this article, the whole concept of an electrochemical gas sensor will be presented, including the basic science and the basic electronical engineering that runs the device. The main concern will be fallen onto a specific amperometric-type sensor as the most common electrochemical sensor in the market. Ultimately, since there are multiple parts that comprise a single electrochemical sensor, a special section will be written within this article to show the array of materials that are responsible to the sensing capabilities of the sensor, particularly in the area of sensitivity and selectivity of gases.
... A simple system for measuring concentrations of CO, NO, NO 2 , O 3 in order to determine the degree of air pollution in the urban environment is presented in [8]. In [9] a microsystem for determining gas concentrations is described, a system based on a 16-bit Atmel AVR microcontroller and an integrated Texas Instruments LMP91000 potentiostat. A particularly interesting wireless system is presented in [10]. ...
Measurement of concentrations of gas components in the air is important in various fields of human activity: environmental protection, biochemistry, medicine, agriculture, food technology, sports, etc. In this paper is presented the possibility of a radio frequency identification (RFID) type sensor capable of functioning in wireless sensor networks (WSN) and aimed for measuring the concentrations of gas components in the air. The sensor consists of an electrochemical cell for sensing an air gas component, a potentiostat type measuring circuit, a coordinating microcontroller and an RFID tag. Practical implementation was based on an O2-A2 electrochemical cell, the integrated LMP91000 potentiostat, the MSPG2233IPW20 microcontroller and the Andy100 RFID transponder. With this system, measurements have been made in order to determine the degree of oxygen in the air. By using other electrochemical cells the concentrations of other gas components in the air or fluids in general can be determined.
... One particular method for measuring gas levels is that based on the use of electrochemical cells and circuits of potentiostat type [1][2][3]. The method considers the control of potential of electrodes in the gas cell by providing an accurate feedback to compensate changes in cell impedance during the measurement [4][5][6]. Methods relaying on electrochemical cells and potentiostat circuits are extensively used for creating electrochemical biosensors for detection and measurement of biomarkers associated with different diseases [7,8]. Development of patient self assessment, ambient assisted living and electronic healthcare applications has increased the demand for wearable chemosensors [7,9,10] for which different architectures have been proposed [7,9,11], including those for gas sensing [6,12]. ...
... Methods relaying on electrochemical cells and potentiostat circuits are extensively used for creating electrochemical biosensors for detection and measurement of biomarkers associated with different diseases [7,8]. Development of patient self assessment, ambient assisted living and electronic healthcare applications has increased the demand for wearable chemosensors [7,9,10] for which different architectures have been proposed [7,9,11], including those for gas sensing [6,12]. ...
... The value of the new parameter is entered in the text field under the button. 6. Save data to disk -in addition to displaying measured data, the application offers the possibility to save them in a Comma Separated Values (csv) file for later processing or display. ...
The paper presents a multiple gas sensing platform using different gas sensors built on RFID technology. The RFID sensor consists of an electrochemical cell for sensing a gas component, an integrated potentiostat circuit, an energy harvesting and communication circuit, a voltage monitor and a coordinating microcontroller. The paper presents a single cell type and a multiple cell type RFID sensors that can be used with the sensing platform. The sensors were implemented using the integrated LMP91000 potentiostat and the Medusa-M2233 RFID tag which includes the low power MSPG2233IPW20 microcontroller. An application to control the sensing platform consisting of RFID sensors, RFID reader and a PC was developed and tested using the gas cells O2-A2 and CO-CF for sensing oxygen and carbon monoxide respectively.
... This allows for a wide range of analyte detection including ethanol, gas and heavy metal detection, as well as biosensing. For these reasons, studies focusing on potentiostats for point-of-need applications have increased rapidly in the past few years [2,3,[19][20][21][22][23][24]. ...
The work presented details the manufacturing of a low-cost hybrid inkjet-printed paper-based potentiostat, with the aim of creating a low-cost sensing system for rapid water quality monitoring. Potentiostats exhibit high sensitivities and can be used for a variety of applications. The results highlight the functionality of a paper-based potentiostat compared to a potentiostat manufactured on a printed circuit board (PCB), an LMP91000EVM development board and a laboratory-based Metrohm Autolab potentiostat. Cyclic voltammetry was performed using an 80 μL sample of 5 mM ferri-ferrocyanide dropped onto a commercial screen-printed electrode from DropSens. The miniaturized paper-based potentiostat is small enough to be stored in a wallet and therefore easy to transport. Furthermore, a cost analysis shows that the potentiostat is 10 times lower in cost than the commercially available handheld potentiostat, taking the costs of man hours into account. This technology enables electrochemistry experiments to be performed on-site using the portable, disposable and low-cost solution and can be applied to a variety of fields including healthcare, wearables and environmental monitoring.
... Measuring system consisting of ten our own design electronic modules have been used for sensor response acquisition. More detailed description of the developed measuring systems is presented elsewhere [8,9]. ...
... Therefore, interest in the use of potentiostats for environmental point-of-need applications has grown rapidly over the past few years. Potentiostats have a high sensitivity and can be used for a variety of applications such as gas detection, biosensing, ethanol detection and heavy metal detection [2,3,[14][15][16][17][18][19]. ...
... A newly-developed material can be used as a gas sensor if it possesses an efficient sensing performance (high sensitivity, selectivity and response rate) and reliability (drift, stability and interfering gases). 1 In this regard, polymeric composite materials containing conducting or semiconducting fillers have attracted special attention, particularly due to their flexibility and tailorable properties. 2 These materials possess superior thermal, mechanical, electrical and sensing properties compared to their pristine counterparts. 2 Recent years have witnessed the development of numerous gas sensing materials, viz., metal-oxide semiconductors, intrinsically conducting polymers, conducting polymer composites, metal-oxide polymer composites, etc. [3][4][5][6][7][8][9][10][11] Particularly, semiconducting polymeric composites are highly desirable as sensors owing to their multifunctional nature, which allows them to serve simultaneously as a filtering device as well as a means to quantitatively determine the amount of volatile organic compounds (VOCs). ...
... A newly-developed material can be used as a gas sensor if it possesses an efficient sensing performance (high sensitivity, selectivity and response rate) and reliability (drift, stability and interfering gases). 1 In this regard, polymeric composite materials containing conducting or semiconducting fillers have attracted special attention, particularly due to their flexibility and tailorable properties. 2 These materials possess superior thermal, mechanical, electrical and sensing properties compared to their pristine counterparts. 2 Recent years have witnessed the development of numerous gas sensing materials, viz., metal-oxide semiconductors, intrinsically conducting polymers, conducting polymer composites, metal-oxide polymer composites, etc. [3][4][5][6][7][8][9][10][11] Particularly, semiconducting polymeric composites are highly desirable as sensors owing to their multifunctional nature, which allows them to serve simultaneously as a filtering device as well as a means to quantitatively determine the amount of volatile organic compounds (VOCs). 12 Thus, the design of novel polymeric composites can be considered as an emerging area of material development for effective gas sensing applications. ...
... In order to perform sensing studies, a simple experimental set-up equipped with vapour generation at a flow rate of 20 ml min À1 was constructed. The chemical reaction involved in the generation of SO 2 vapours is shown below in eqn (1): 53 Na 2 SO 3 (s) + 2H 2 SO 4 (aq) = 2NaHSO 4 (s) + H 2 O(aq) + SO 2 (1) ...
Polyvinyl alcohol formaldehyde (PVF)-based composites are synthesized and applied for rapid detection and quantification of sulphur dioxide (SO2) vapours by electrical impedance measurements. A series of polymeric composites, namely PVF/single-walled carbon nanotubes (PVFCNTs), PVF/carbon nanoparticles (PVFCNPs), PVF-coumarin-6 (PVFCOU), PVF/thiophene (PVFTH) and PVF/cytochrome-6-oxidase (PVFCY), are synthesized in high yields by a simple one-pot approach. These were characterized by FT-IR, AC conductivity and FESEM. The composites were then used for the impedimetric detection of SO2 vapours, and the sensitivity was found to follow the order: PVFCOU > PVFTH > PVF. The current vs. voltage (I-V) curves further demonstrated a second-order decrease in conduction for PVFCOU upon exposure to SO2 vapours. Amongst the synthesized composites, PVFCOU exhibited an excellent response time of 3 s for 400 ppt SO2, with a limit of detection of 1.15 ppb. Our findings demonstrate, for the first time, an AC electrical impedance-based SO2 detection, using the PVFCOU polymeric composite. In addition, this polymeric composite fulfills the dual function of highly efficient sensing and analyte sequestration. Thus, PVFCOU may be an ideal cost-effective solid-state sensor material for onsite vapour sensing applications.
... They generally employ software or data management tools that are not user-friendly. Hence, there is a strong need to develop mobile and costeffective (Jasinski et al., 2015), and user-friendly systems that is integrated with software written in native language, in our case Turkish. ...
... These sensors generate a current response signal that is proportional to ambient gas concentration. The relationship between sensor response and gas concentration is linear (Kızıl et al., 2000;Jasinski et al., 2015). In this study it was aimed to develop a mobile device and method that is applicable to on-site air quality monitoring based on the principle of this linear relationship. ...
A gas sensor based electronic nose system is developed for monitoring air quality dispersion in and around livestock barns. The mobile system can be used in various applications under laboratory and field conditions. The system consists of 10 metal oxide Figaro gas sensors and a temperature/humidity sensor integrated with custom made circuits and data acquisition software. The sensors are sensitive to major odorous compounds. The e-nose system provides an easy, cost effective and user friendly tool for air quality monitoring. There is a relationship with sensor responses and gas concentrations are linear. Therefore, instead of calculating concentrations using statistical methods such as PCA and ANNs raw sensor data is used to monitor air quality. In order to monitor spatial distributions of sensor responses Kriging method is applied. Interpolation maps for each sensor response are developed. In order to visualize the areas where air quality problems occur, response of an air quality module is used as reference. Results showed the effectiveness of the developed system and method.
