Sensitivity For Nominal Measuring Range Is 270 MV/V (Bridge Output Per 1 V Supply Voltage) Essays Examples
Supply voltage =5 Vrms
Linearity error- 2% of the total range (related to the ± range limits of the transducer)
Carrier frequency-3 to 5 kHz
Permissible Environmental: -20 to +120˚ C (-4 to 248˚ F)
Temperature: Sensitivity 0.1% / K
Nominal inductance: solenoid plunger in middle position: 20 + 20 mH. Maximum displacement: 7 + 26 mH 50%. Displacement: 13 + 26 mH. Driven out: 5 + 5mHCapacitance: 250 pF (each winding)
Standard accessories: connector: Cannon MS 3106E10SL-3S. Solenoid plunger with M3 threaded rod
Applications of LVDTBottle inspection machine LVDTs present an excellent opportunity to upgrade nearly any system already equipped with a finite position feedback device. A bottle inspection machine uses an LVDT to enhance the overall performance when replacing an existing sensor such as the proximity switch. The LVDT provides a continuous measurement feedback with infinite resolution. An entire series of proximity switches can be a substituted with one LVDT to minimize on the equipment cost (Nyce, 55). LVDT can be retrofitted as a replacement sensor using a simple re-fixing and installation. The type of replacement determines the electronic compatibility. Series 240 DC-DC LVDT or an AC-AC LVDT with a separate oscillator/demodulator can be used to replace DC sensors or switches. Lucky replacements of the LVDT makes some degree of compatibility between output signals essential while avoiding the development of a new control circuit. A group of non-contact proximity switches can be replaced with a single LVDT in the main product line of bottle inspection machines. A system specifically designed to perform deep penetration gagging required by tall neck, large diameter bottles such as one gallon and 2-litre wines has this application (Herceg 87). A computer is used to control all the inspection functions through propriety inspection procedures. The bottle height is sensed by measuring the position of a vertical rod coming in contact with the mouth of the bottle. The rod’s motion is monitored by the non-contact proximity switches. Located in the vicinity of the rod, only the points where switches are placed will position be recorded. The feedback is continuous when an LVDT is connected in series with the rod. An infinite amount of detectable points is provided in the process. The LVDT usually has a higher accuracy and much longer displacement ranges. Other functions such as finish and body geometry are conducted simultaneously (Nyce 61).Brain surgery machine A sophisticated modular probe drive has been developed to support streamlined implantation of deep brain stimulating electrodes. Model 0237-0003 AC-AC LVDT is placed at the heart of this system. The transducer is modified to withstand steam autoclaving (the sterilization process often required for surgical tools). Its added features include sealing to resist moisture and increased temperature ratings. The carrier is moved by the instrument through a unique push/pull cable drive mechanism. The carrier guides the probe to the problem area of the brain. A dial micrometer is used by a surgeon to manipulate the up and down motion. The LVDT is mounted at the top of the structure while pointed in the same direction as the probe. The LVDT core and extension rod are attached to the carrier and follow its movement while the body is held stationary. The position of the probe is accurately monitored by the LVDT as it is used to place electrodes carefully in the targeted area. The same situation is calibrated manually as a secondary check. The feedback signal from the transducer is displayed on the meter while data is also collected to “map” surface features of the brain (Herceg 96).Potentiometers Potentiometers (Pots) are electronic components used to measure position changes in a circuit using electrical resistance. The device measures the flow of electricity through a circuit and uses that information to indicate absolute displacement. Potentiometer vendors include companies like ETI Systems, Spectra symbol, and esources.Specifications
Type: surface mount chip
Tolerance +- 25%
Operating voltage: 20VDC or AC RMS, max.
Power rating: 1W @ 70oC max
Temperature range: -20oC`+85oC
Applications of PotentiometersIn Comparison of EMF's of two cells. Consider the circuit given below.Fig. 1 Potentiometer arrangements for the comparison of EMFs of two cells.Two cells of EMFs E1 and E2 are to be compared in the experiment. The positive terminals of the two cells are connected to the terminals A. The remaining negative terminals are connected to jockey through the two-way key K2 and a galvanometer. K1 is first closed to establish a potential difference between the terminals A and B. Closing key K2 introduces cell of EMF E1 in the circuit, and null point junction J1 is determined with the help of jockey. If the null point on a wire is at length I1 from A thenE1=KI1, where K is the potential gradient along the length of wire.Similarly, cell having emf E2 is introduced into the circuit and again null point J2 is determined. If the length of this null point from A is l2 then E2=Kl2. Therefore E1/E2=I1/I2. The relation allows us to find the ratio of E1/E2. If the EMF of one cell is known, then the EMF of another cell can be known easily (Todd 54).In determining the internal resistance of a cellPotentiometer can also be used to determine the internal resistance of a cellFig. 2 Potentiometer arrangements for determining internal resistance of a cell. A cell is connected to terminal A of the potentiometer through key K2. The cell whose internal resistance is to be determined should be connected across a resistance box. Key 1 is first closed to obtain the null point. Then, let I1 be the length of this null point from terminal A then E=KI1When key K2 is closed, the cell sends current through resistance Box (R). If E2 is the terminal potential difference and a null point is obtained at length I2(AJ2) then V=KI2. Thus E/V=I1/I2.However, E=I(R+ r) and V=IR. To give E/V=(r+R)/R.So (r+R)/R=l1/l2, giving r=R(I1/I2-1). The internal resistance of any given cell can thus be easily determined (Herceg 112).
Herceg, Edward E. Handbook Of Measurement And Control. [Pennsauken, N.J.]: Schaevitz Engineering, 1972. Print.
Nyce, David S. Linear Position Sensors. Hoboken, NJ: Wiley-Interscience, 2004. Print.
Todd, Carl David. The Potentiometer Handbook. New York: McGraw-Hill, 1975. Print.
Transtekinc.com,. 'LVDT Applications | Transducers, Velocity & Position Sensors LVDT Sensors By Trans-Tek'. N.p., 2015. Web. 23 Feb. 2015.
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