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FEATURES Wide detecting scope Fast response and High sensitivity Stable and long life Simple drive circuit APPLICATION They are used in gas leakage detecting equipments in family and industry, are suitable for detecting of LPG, i-butane, propane, methane ,alcohol, Hydrogen, smoke. SPECIFICATIONS A. Standard work condition Symbol Vc VH RL RH PH Parameter name Circuit voltage Heating voltage Load resistance Heater resistance Heating consumption Technical condition 5V±0.1 5V±0.1 can adjust 33Ω±5% less than 800mw Remarks AC OR DC ACOR DC Technical condition -20℃-50℃ -20℃-70℃ less than 95%Rh 21%(standard condition)Oxygen concentration can affect sensitivity Remarks Room Tem B. Environment condition Symbol Tao Tas RH O2 Parameter name Using Tem Storage Tem Related humidity Oxygen concentration minimum value is over 2% C. Sensitivity characteristic Symbol Rs Parameter name Sensing Resistance α (3000/1000) isobutane Standard Detecting Condition Preheat time Technical parameter 3KΩ-30KΩ (1000ppm iso-butane ) Concentration Slope rate ≤0.6 Temp: 20℃±2℃ Humidity: 65%±5% Vc:5V±0.1 Vh: 5V±0.1 Over 24 hour Remarks Detecting concentration scope： 200ppm-5000ppm LPG and propane 300ppm-5000ppm butane 5000ppm-20000ppm methane 300ppm-5000ppm H2 100ppm-2000ppm Alcohol D. Structure and configuration, basic measuring circuit 1 2 3 4 5 6 7 8 9 Parts Gas sensing layer Electrode Electrode line Heater coil Tubular ceramic Anti-explosion network Clamp ring Resin base Tube Pin Materials SnO2 Au Pt Ni-Cr alloy Al2O3 Stainless steel gauze (SUS316 100-mesh) Copper plating Ni Bakelite Copper plating Ni Fig.2 Fig. 1 Configuration A Configuration B A向 A向 Structure and configuration of MQ-2 gas sensor is shown as Fig. 1 (Configuration A or B), sensor composed by micro AL2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a TEL: 86-371- 67169070 67169080 FAX: 86-371-67169090 E-mail: email@example.com
MQ-2 Semiconductor Sensor for Combustible Gas Sensitive material of MQ-2 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist, The sensor’s conductivity is more higher along with the gas concentration rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration. MQ-2 gas sensor has high sensitity to LPG, Propane and Hydrogen, also could be used to Methane and other combustible steam, it is with low cost and suitable for different application. Character Configuration *Good sensitivity to Combustible gas in wide range * High sensitivity to LPG, Propane and Hydrogen * Long life and low cost * Simple drive circuit Application * Domestic gas leakage detector * Industrial Combustible gas detector * Portable gas detector Technical Data Basic test loop T Model No. MQ-2 Sensor Type Semiconductor Standard Encapsulation Bakelite (Black Bakelite) Detection Gas Combustible gas and smoke VRL 300-10000ppm Concentration Vc Heater Voltage VH 5.0V±0.2V ACorDC RL Adjustable Load Resistance Heater Resistance Heater consumption Character Sensing Resistance RH DC GND The above is basic test circuit of the sensor. 31Ω±3Ω（Room Tem.） heater voltage （VH） and test voltage （VC） . VH used to supply certified working PH ≤900mW temperature to the sensor, while VC used to detect voltage (VRL) on load resistance Rs 2KΩ-20KΩ(in 2000ppm C3H8 ) （RL）whom is in series with sensor. The sensor has light polarity, Vc need DC...
pH Probe Datasheet A pH electrode is a passive device that detects a current generated from hydrogen ion activity. This current (which can be positive or negative) is very weak and cannot be detected with a multimeter, or an analog to digital converter. This weak electrical signal can easily be disrupted and care should be taken to only use proper connectors and cables. ADC Result will always read zero. 00000000 Result will always read zero. The current that is generated from the hydrogen ion activity is the reciprocal of that activity and can be predicted using this simple equation: Where R is the ideal gas constant. T is the temperature in Kelvin. F is the Faraday constant. Because a pH probe is a passive device it can pick up voltages that are transmitted through the solution being measured. This will result in incorrect readings and will slowly damage the pH probe over time. Atlas-Scientific.com Copyright © Atlas Scientific LLC All Rights Reserved pH Probe This pH Probe can be fully submerged up to the BNC connector indefinitely. • pH range: 0-14 (Na+ error at >12.3 pH) • Temperature range: 1˚C to 99˚C • Max pressure: 690 kPa (100PSI) • Dimensions: 12mm X 150mm (1/2" X 6") • Resolution: This is an analog device so, its resolution is limited only by the device reading it. Helpful Operating Tips FIG. 1 FIG. 2 1. The pH Probe is shipped in a plastic bottle containing pH Probe Storage Solution. The probe should remain in the bottle until it is used. If the probe is used infrequently, the bottle and its solution should be saved and the probe stored in it (See Sensor Storage Section). Take out the probe by loosening the plastic top of the bottle counter clockwise and pulling the probe out. Slide the cap and O-ring off the probe. (SEE FIGS 1 & 2).
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TEA5711; TEA5711T AM/FM stereo radio circuit Product speciﬁcation Supersedes data of October 1992 File under Integrated Circuits, IC01 Philips Semiconductors September 1994 Philips Semiconductors Product speciﬁcation AM/FM stereo radio circuit TEA5711; TEA5711T • Designed for simple and reliable printed-circuit board layout FEATURES • Wide supply voltage range: 1.8 or 2.1 to 12 V • High impedance MOSFET input on AM. • Low current consumption: 15 mA at AM, 16 mA at FM • High selectivity with distributed IF gain APPLICATIONS • LED driver for stereo indication • High input sensitivity: 1.6 mV/m (AM), 2.0 µV (FM) for 26 dB S/N • Portable AM/FM stereo radio • Good strong signal behaviour: 10 V/m at AM, 500 mV at FM • Personal headphone radio. • Low output distortion: 0.8% at AM, 0.3% at FM DESCRIPTION • Mini/midi receiver sets • Signal level output The TEA5711 is a high performance Bimos IC for use in AM/FM stereo radios. All necessary functions are integrated: from AM and FM front-end to AM detector and FM stereo output stages. • Soft mute • Signal dependent stereo QUICK REFERENCE DATA SYMBOL
The purpose of these diagrams is to graphically explain the overall operation of AM, PM, and FM communications systems using very little mathematics. This explanation is accomplished by tracing a simple sinusoidal signal through all stages of each system. Although students who are "mathematically challenged" will find these diagrams very helpful, most students who are beginning the study of electrical communications systems can benefit from these same diagrams. More advanced courses can also use these diagrams as a basis on which to organize and present abstract mathematics. ● S tudents: M. B. Suranga Perera, Nikolay Ostrovskiy and Johnny Lam. They produced the professional graphics in these vector art diagrams and created the pages. To pay these students, the following persons or organizations at NYCCT generously offered financial advice or funds: The unique features of these diagrams are the following: presenting the signal in both the time domain and frequency domain together at each stage of the communication process ● using a color code to show the distribution of information in the signals in both the time domain and frequency domain simultaneously. ● Former Dean Phyllis Sperling of the School of Technology & Design ● ● Former Dean Annette Schaefer of the School of Arts and Sciences ● Professor Joseph Rosen, head of the Freshman Year Program at NYCCT and current acting Dean of the School of Liberal Arts and Sciences The history of preparing this booklet is a long one. Before beginning the arduous work of producing these diagrams, we inspected about 70 standard textbooks on electrical communications to determine whether we could save ourselves a lot of effort by simply using their diagrams; but none of those books contained the above simultaneous diagrams. Some of the basic ideas underlying these diagrams were presented by us in 2001 at a conference of FIE (Frontiers In Education) in Reno, Nevada. Completion of this booklet took about three more years of devoted labor, research, and collaboration. Ms. Jewel Escobar, Executive Director of NYCCT Foundation