1. In an automatic mixing operation the sequence of operation is as follows: When the start button is pressed fill the tank with Liquid B till it reaches X1 and then fill the tank with Liquid A till it reaches X2. Once the level of Liquid reaches X2, turn on the motor for another 20 seconds for mixing process. After the timer stops timing, empty the tank by opening the mixture outlet. X1 and X2 are capacitive proximity sensors and there are start, stop and emergency stop push buttons. XO START X1 STOP YO (Liquid A Inlet ) EMERGENCY STOP YI(Liquid B Inlet) Y2(Mixture Outlet) For the system explained above answer the following: a) Provide the Allocation List b) Draw the Grace and extract the grafcet equation c) Draw the Ladder Diagram

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.