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  • HEM ELECTRONIQUES,C-46, M.I.D.C, MIRAJ 416410

    INSTRUMENTATION TUTORS :IT With expanding technology, role of electronic Instrumentation and control engineering has become very prominent. Instrumentation is now becoming an interdisciplinary subject, which is very important for all branches of engg. The modules designed as Instrumentation tutors, are simple to use, elegantly designed and try to develop complete insight into the subject. Digital Instrumentation Tutor part I, II & III is available in three parts. All the transducers provided with the set up are suitably mounted. The set up includes necessary accessories, cables and connectors. Digital Instrumentation Tutor is self-contained with one DPM (to be shared) and power supplies. Other technical specifications are as per individual modules. DIGITAL INSTRUMENTATION TUTOR PART-I Covers speed with (Photo electric pickup & magnetic Pick-up), Thermocouples, RTD, & Thermistor with accessories, HP. motor with speed controller, heater, cables water bath etc. D.P.M.199.9mv. Panel size: 590*290*300mm. DIGITAL INSTRUMENTATION TUTOR PART-II This covers LVDT and Strain gage. LVDT range is +/- 20mm and strain gage set up comes with 4kg weights and cantilever beam mounted with 4 strain gages. D.P.M.1999mv. Box Size: 570*290*260mm. DIGITAL INSTRUMENTATION TUTOR PART-III This includes inductive pick-up, capacitive pick-up (for angular displacement measurement), piezo electric pick-up and LDR. All transducers with cables are supplied. D.P.M.1999mv.Size: 590*290*300mm OR DIGITAL INSTRUMENTATION TUTOR IN SEPRATE MODULES. The following units are housed in individual MS power coated elegant boxes with anodized front plates marking all the controls. Every unit has its own power supply along with signal conditioning circuitry and digital display. The relevant sensor and detailed instruction manual with be supplied along the set up. Following are the general specifications of the transducer trainers. 1.SPEED MEASUREMENT MODULE. (IT-1) Panel: BOX TYPE PANEL DIMENSIONS:192*96*300MM. DPM 1 NO, 200MV, + OR 1999 COUNTS Test points for observing various waveforms on the CRO. Selector switch for selection of the transducer is provided & the speed of d.c. motor can be measured with the help of photo electric and magnetic pick up. This sensor is mounted on a rigid base supporting HP variable speed D.C. Motor for the measurement of speed. The variable reluctance pick up and the

  • HEM ELECTRONIQUES,C-46, M.I.D.C, MIRAJ 416410

    photo electric pick up will be mounted on either side of the motor and the indicated speed can be checked with the help hand held tachometer generally available in the laboratory. The range of speed variation will be 150 to 1500 RPM and a speed controller for the d.c. motor is also provided. Necessary cable connections are also supplied. Photoelectric pick up consists of a transistor alongwith light source.Range: 150 RPM to 1500 RPM. Built in calibration source of 500 Hz provided.Accuracy +/- 1% of full scale. IT-1(P)Speed measurement with proximity switch with 12V motor and rpm indicator With digital indicator and maximum speed 2000 RPM.With cables and variable power supply suitable for 12 volt motor for speed variation. 2.THERMOCOUPLE MODULE. (IT-2) Panel provisions: DPM 200mv.Box size: 192*96*160mm. Thermocouple (Chromel-Alumel) suitable for the range 0 to 100 degree centigrade will be supplied along with the set up.In order to perform the temperature measurement (ie thermocouple, RTD and thermistor) a water container along with 1 kW heater, cable will be supplied as a common accessory for all these experiments. A standard laboratory thermometer will also be supplied. Accuracy: +/- 1.5%

    3.THERMISTOR MODULE. (IT-3) Panel provision: DPM 2 volts, Box size: 192*196*160 mm. An NTC thermistor with a nominal value of resistance, at 25 degree centigrade, of 1 kohm will be supplied. The resistance Vs Temp. characteristics in the range 0 to 100 degree centigrade can be plotted. To protect the thermistor from water, this bead type element will be enclosed properly. This is a non-linear element with maximum allowable temperature of 150 degrees centigrade. Accuracy: non-linear response.

  • HEM ELECTRONIQUES,C-46, M.I.D.C, MIRAJ 416410

    4.RESISTANCE TEMPERATURE DETECTOR (RTD) MODULE. (IT-4) Panel provisions: 200mv DPM, Box size: 192*96*300 mm. A standard PT-100 element enclosed in a stainless steel cover along with teflon wire will be supplied. This is a very good linear transducer giving a reliable performance over a wide range of temperature. The transducer exhibits a resistance of 100 ohms at 0 degree centigrade and 139 ohms at 100 degree centigrade. We can study and plot the characteristics of transducers in terms of temperature versus indicated temperature and also temp. versus resistance characteristics .Maximum temp. is 200 degree centigrade and accuracy +/- 1%. 5.LINEAR VARIABLE DIFFERENTIAL TRANSFORMER (LVDT) MODULE. (IT-5a & IT- 5b) Panel provision: DPM 2 volts Box size: 192*96*300mm. a) This transducer enables measurement of mechanical displacement in the range of +/- 20 mm using an ordinary scale. Provision is made for 30-cm long fibreglass housing and magnetic core alongwith primary and secondary windings. An over all accuracy of +/- 2% of full scales is possible. Appropriate test points are also provided for observation of waveforms. Primary excitation at around 4 kilohertz and 1 volt RMS is used. b) LVDT using Dial Gage: in this module input displacement can be measured very accurately by using a dial gage in the range 0 to 10 mm. Over all accuracy of +/- 1% can be expected from this module. Other specifications remains as in part (a) above. 6.STRAIN GAUGE MODULE. (IT-6a & IT-6b) Panel provisions: DPM 2volts, Box size: 192*96*300 mm. a) Four no. of strain gages with nominal value of 350 ohms are mounted on a

    cantilever beam which can be loaded with the help of weights in a pan. The system is designed for a maximum of 5-kg load and can be used as a load cell also. Detailed calculations regarding stress and strain in the beam can be performed. Provision is made for two- arm and four-arm operation. Bridge balance controls in terms of coarse control and fine control are provided. An

  • HEM ELECTRONIQUES,C-46, M.I.D.C, MIRAJ 416410

    amplifier with variable gain in the range of 0 to 1000 is used for signal processing.

    Accuracy: +/- 1% b) An industrial type of load cell with 10-kg capacity will be providing at an extra

    cost.

    7.STUDY OF INDUCTIVE PICK UP. (IT-7) Panel provisions: DPM 2 volts. Box size: 192*96*300mm. Inductive pick up is mounted on a rigid base holding 25 to 50 mm-precision micrometer with least count of 10 microns. The displacement of the magnetic core in the micrometer can be measured with an accuracy, which is better than +/- 2% in the range 0 to 5.0 mm. Appropriate test points are provided on the rear of the panel.

    8.STUDY OF CAPACITIVE PICK UP. (IT-8) Panel provisions: DPM 2 volts. Box size: 192*96*300mm Variable gang condenser on a suitable base forms part of a Wein bridge oscillator and the system can be used to demonstrate measurement of angular displacement in the range of 0 to 170 degrees. However the response of the transducer is non-linear. Appropriate test points are provided.

  • HEM ELECTRONIQUES,C-46, M.I.D.C, MIRAJ 416410

    9.STUDY OF PIEZO ELECTRIC TRANSDUCER (PIEZO ELECTRIC MODULE). (IT-9) Panel provisions: 2 volt DPM Box size: 192*92*160 mm. Mounted on rigid base provided with UHF cable connection & high input impedance signal conditioning circuit provided for transducer isolation from measurement device. This system demonstrates how dynamic force can be converted into a voltage. No quantitative measurement can be carried out on the set up.This is only a demo. Set up.

    10.Study of LDR (Study of Light Dependant resistance or study of photo conductive cell) (IT-10) Panel provisions:BOX SIZE:192*96*160MM.2 volt DPM Even though the response is linear over a limited range, measurement of displacement over range of 15 cm with LDR and light source is possible in this set up. This system also facilitates characteristics of LDR (Photoconductive cell) in terms of resistance versus distance when calibration pot is fully clockwise. The input /output response is non-linear for this transducer. 11.STUDY OF HALL EFFECT SENSOR. (IT-11) Panel provisions:BOX size: 192*96*300MM. Two digital panel meters, one for flux density measurement and other for current measurement. A linear Hall effect sensor IC is used as a sensing element in this set up, which facilitates measurement of flux density B in millitesla(up to 40-m tesla). Calibration is done with a suitable solenoid excited by a known controllable current source. A digital panel meter is provided for current measurement.

  • HEM ELECTRONIQUES,C-46, M.I.D.C, MIRAJ 416410

    Accuracy of the order of +/- 2% can be expected. Magnetic field of permanent magnet also can be investigated. 12 . WATER LEVEL MEASUREMENT USING STATIC PRESSURE SENSOR. (Model IT-12 (a)) Panel provisions:DPM 1No (0 to 2V). BOX size: 192*96*160MM. Water level measurement and indication is done with the help of static pressure sensor, which is a two wire transmitter operating in the range 4ma to 20 ma (for 0 to 1 bar pressure range.). The static pressure, experienced by sensor because of water height changes, is linearly related with water height. The current changes for the sensor are converted into voltage changes by appropriate I to V convertor,zero balance and calibration (Max.) controls. The current output may be measured by an external DMM (not covered in scope of supply).A small tank with 1 Meter height and mechanical gauge indicator is provided. Range: 5cm