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Pressure is a very important parameter in most industrialapplications such as air conditioning, liquid level sensing andflow control.In most cases, the sensor is located close to the measuredsource in a very noisy environment, far away from the receiver(recorder, computer, automatic controller, etc.)The transmission line can be as long as a few hundredmeters and is subject to electromagnetic noise when thesignal is transmitted as voltage. If the signal is transmitted asa current it is easier to recover at the receiving end and is lessaffected by the length of the transmission line.The purpose of this note is to describe a simple circuit whichcan achieve high performance, using standard Motorolapressure sensors, operational amplifiers and discretedevices.
