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Mechanical Measurement and Control

by Manoj Kumar RoutManoj Kumar Rout
Type: PracticalInstitute: Biju Patnaik University of Technology BPUT Course: B.Tech Specialization: Mechanical EngineeringOffline Downloads: 16Views: 941Uploaded: 1 year ago

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Manoj Kumar Rout
Manoj Kumar Rout
CONTENTS Sl Experiment No 1 Calibration of LVDT using Indicator / CRO product 2 Calibration of Thermocouple 3 Strain Measurement using Resistance Strain Gauge 4 Calibration of a Rota meter for Fluid Flow Measurement Calibration of Bourdon Tube Pressure Gauge and Measurement of Pressure using Manometer 5 PREPARED BY ER. MANOJ KUMAR ROUT Date of Date of Page Expt. submission No. Remarks Page 2
Experiment No: THERMOCOUPLE AIM OF EXPERIMENT: To determine the temperature traducers thermocouple, thermister and Bimetallic by using digital temperature indicator. APPARATUS REQUIRED: Temperature transducers, digital Temperature indicator, Thermometer, Electric Sterilizer, Bimetallic temperature indicator. Type of sensor: “J” type, “K” type and “T” type Material Used: J – Chromium Alumel K – Tungsten steel T – Manganes, Nickel, Copper, Iron and Uranium THEORY: The Thermocouple is one of the simplest and most commonly used methods of measuring process temperature. The operation of thermocouple is based upon see back effect. See back discovered that when is applied to junction (hot junction) of two dissimilar metals, an emf is generated which can be measured at the other junction (cold junction). The two dissimilar metals from an electric circuit and a current flows as a result of the generated emf. A pair of two dissimilar metals that are in physical contact with each other from a thermocouple. These metals welded together. Thermocouples do not use bare conductors except in applications where atmospheric condition permit their use. These condition obtained when temp. to be measured are low and the atmosphere is non-corrosive. Industrial thermocouples employ protective sheathing surrounding the junction and a portion of the extension leads The leads and the junction are internally insulated from the sheath, using various potting compounds, ceramic beads or orides. The type of insulation used depends upon the process being monitored. OPERATION:1. Select the thermocouple by selector switch. 2. Connect the thermocouple, Thermister and Bimetallic to the sensor socket provided at the front panel. 3. Set the min pot to read the ambient temp. in display. 4. Insert the thermocouple, Thermister and Bimetallic in the HOT bath. PREPARED BY ER. MANOJ KUMAR ROUT Page 3
5. 3 ½ Digit led display shows the temperature obtaining at the HOT bath directly in 0 C 6. If necessary adjust the MAX pot for maximum level of temperature calibration. 7. Recorder Red & Green terminals for the analog output. 8. Fuse holder provided to protect the circuit from the over load. CONTROLS: MIN: 10k single turn potentiometer to set the MINIMUM. level of temperature. MAX: 10k single turn potentiometer to adjust the maximum level of the temperature. TABULATION: SL No Thermometer Reading In 0 C Thermocouple Reading In 0 C (J) Bimetallic Reading (K) Thermister Reading In 0 C (T) GRAPH: 1. 2. 3. Thermometer Reading vs Thermocouple reading …….J Thermometer Reading vs Thermocouple reading …….T Thermometer Reading vs Thermocouple reading ……..K Thermocouple reading Thermometer Reading CONCLUSION: PREPARED BY ER. MANOJ KUMAR ROUT Page 4

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