Describe the resistive method for liquid level measurement. Write its advantages and disadvantages.
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This method uses mercury as a conductor. A number of conduct rods are placed at various liquid levels. As head h increases, the rising level of mercury above the datum, shorts successive resistors R and increases the value of h directly.

Advantages 1. Direct reading is possible 2. Simple 3. cost-effective measuring principle 4. Multi-point detection with one process connection 

Disadvantages. 1. The liquid being measured must be conductive in nature. 2. The sensor tips deteriorate over time and can need periodic cleaning to keep them from fouling 3. Deposition of contaminate will give error in reading 

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Working: This method uses mercury as a conductor as shown in the figure. A number of contact rods are placed at various liquid levels. As the level of liquid rises in the tank, head h increases. The level of mercury rises above the datum and shorts successive resistors R and increases the value of h directly. The ammeter connected in series is calibrated in terms of the liquid level and indicates the liquid level directly. 

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