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Farm Buildings

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Submitted By lorimatthews
Words 1995
Pages 8
Farm Buildings and Controlled Environments Lori Matthews S20000832
Assessment 1

1. (i) One method of measuring temperature is a thermistor sensor. This instrument contains a mixture of sulphides or oxides, or metals (iron, cobalt or copper) which have a high resistance at low temperatures but the resistance decreases quickly when warm. Therefore when the temperature changes, the resistance of the thermistor changes in a predictable way. This method of measuring temperature is easy to use and is inexpensive. They are not used for high temperatures, but in temperature ranges where they work they are widely used.

ii) Humidity in farm buildings can be measured using a capacitive film sensor. This is a capacitive thin film polymer sensor consisting of a substrate which has a thin film of polymer placed between two conductive electrodes. An absorptive metal electrode coats the sensing surface to protect it from contamination and exposure to condensation. The substrate used is usually glass or ceramic. The thin film polymer either absorbs or releases water vapour as the relative humidity of the air increases or decreases. These sensors provide high accurancy, excellent long-term stability negligible hysteresis. They are resistant to most chemicals and are not permanently damaged by liquids.

iii) One instrument that is used to record air velocity is a thermal anemometer; also referred to as a ‘hot-wire’. This tool is based on the fact that the resistance of wire changes with temperature, therefore the technique depends on the convective heat loss to the surrounding fluid from an electrically heated sensing element or probe. If only the fluid velocity varies, then the heat loss can be interpreted as a measure of that variable.

2. (i) An appropriate tool to control the temperature in a box potato store containing seed potatoes

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