Temperature Measurement & Control of Biomedical Analyzers

International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue V, May 2018 | ISSN 2321–2705

Temperature Measurement & Control of Biomedical Analyzers

Anju Varghese P, Divya Unni

Department of Electronics, Vidya Academy of Science and Technology, Thrissur, Kerala, India

Abstract—Temperature measurement describes the process of measuring a current local temperature for immediate or later evaluation. The clinical laboratory environment uses temperature to maintain stability of testing samples. So the laboratory environment, analytical reactions, instrumentation and materials must be monitored and controlled to required temperatures. Clinical laboratories need to measure a range of physical parameters, among them humidity, pressure, and air flow. But paramount is temperature. It is the basic building block of most analytical measurements. Most test systems used for in vitro tests are of biological origin. In vitro tests are performed with microorganisms, cells, or biological molecules outside their normal biological context. They are usually highly sensitive, so their control conditions (such as incubator temperatures) are very important. Physical properties can also change as temperatures vary. The stability of reagents kept at room temperature decreases if the temperature exceeds about 350°C. Under atmospheric pressure, aqueous liquid viscosity decreases with increasing temperature, generally by about 2% per 0°C. This module is used for maintaining specific temperatures for different biomedical tests.Temperature is measured using thermistor and it is controlled by applying PID Algorithm. They are usually employed in instrumentation and measurements below about 2000°C because of their smaller size, smaller thermal mass, and reasonable response time.

Index Terms—PID Algorithm, Thermistor, Incubator Temperature

I. INTRODUCTION

Temperature control is a process of changing the temperature of a sample, and the heat energy is passed into or out of the space to achieve a desired temperature. A temperature sensor constantly checks the room temperature and controls the current temperature using a heater or air conditioner to increase or decrease the temperature according to the settings. A thermostat makes the heater or air conditioner on or off. It varies the amount of heating or cooling given by the heater or cooler, depending on the difference between the desired temperature and the original temperature. This is Proportional control.

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