Development of a semi-adiabatic isoperibol solution calorimeter

A semi-adiabatic isoperibol solution calorimeter has been indigenously developed. The measurement system comprises modules for sensitive temperature measurement probe, signal processing, data collection, and joule calibration. The sensitivity of the temperature measurement module was enhanced by usi...

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Bibliographic Details
Published in:Review of scientific instruments 2014-12, Vol.85 (12), p.124904-124904
Main Authors: Venkata Krishnan, R, Jogeswararao, G, Parthasarathy, R, Premalatha, S, Prabhakar Rao, J, Gunasekaran, G, Ananthasivan, K
Format: Article
Language:English
Subjects:
Adiabatic flow
CALIBRATION
CALORIMETERS
CONTROL
Data acquisition
HEAT
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
LOCK-IN AMPLIFIERS
Microcontrollers
Microprocessors
Modules
PERSONAL COMPUTERS
Platinum
Scientific apparatus & instruments
SENSITIVITY
SENSORS
Signal processing
SOLUTIONS
TEMPERATURE MEASUREMENT
THERMISTORS
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Summary:A semi-adiabatic isoperibol solution calorimeter has been indigenously developed. The measurement system comprises modules for sensitive temperature measurement probe, signal processing, data collection, and joule calibration. The sensitivity of the temperature measurement module was enhanced by using a sensitive thermistor coupled with a lock-in amplifier based signal processor. A microcontroller coordinates the operation and control of these modules. The latter in turn is controlled through personal computer (PC) based custom made software developed with LabView. An innovative summing amplifier concept was used to cancel out the base resistance of the thermistor. The latter was placed in the dewar. The temperature calibration was carried out with a standard platinum resistance (PT100) sensor coupled with an 8½ digit multimeter. The water equivalent of this calorimeter was determined by using electrical calibration with the joule calibrator. The experimentally measured values of the quantum of heat were validated by measuring heats of dissolution of pure KCl (for endotherm) and tris (hydroxyl methyl) amino-methane (for exotherm). The uncertainity in the measurements was found to be within ±3%.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4903908