In chemical processng, the level of liquid in a tank is often indicated by "load cells" that support the tank. These load cells read out the total weight of the fluid that is in the tank. Assume that the weight of the fluid in a small tank is indicated by the load cell readout shown below. You can assume that the rounding is done correctly (for example an actual weight of 0.049 kg is rounded down and displayed as 000.0 kg on the display below while 0.051 kg is rounded up and displayed as 000.1 kg) kg a) In the space below, write the least count, and the Instrument Limit of Error. (include units) for the load cell/readout shown above Least Count: Instrument Limit of Error: b) An engineer observes that after adding 0.8 kg of fluid (as measured with a recently calibrated and certified balance) to the tank, the above display that read 100.0 kg before the fluid addition does not change. However, when another 0.4 kg is added, the display shows 101.0 kg. What would you recommend as the absolute error assigned to the measurement of the fluid weight using the above load cell/readout, based on this observation? Write the value that you would recommend as the absolute error in the space below (include units) c) A mass flow rate for the feed pump to the above tank is determined using the above load cell/readout and a digital stopwatch that shows only whole seconds. In ten seconds (as determined by the stopwatch) you found that the display changes from 500.0 kg to 550.1 kg. Using a "worst case" approach to error propagation, show the mass flow rate including the absolute error and units in the space below. Base your calculations on the absolute error that you recommended in b) In chemical processng, the level of liquid in a tank is often indicated by "load cells" that support the tank. These load cells read out the total weight of the fluid that is in the tank. Assume that the weight of the fluid in a small tank is indicated by the load cell readout shown below. You can assume that the rounding is done correctly (for example an actual weight of 0.049 kg is rounded down and displayed as 000.0 kg on the display below while 0.051 kg is rounded up and displayed as 000.1 kg) kg a) In the space below, write the least count, and the Instrument Limit of Error. (include units) for the load cell/readout shown above Least Count: Instrument Limit of Error: b) An engineer observes that after adding 0.8 kg of fluid (as measured with a recently calibrated and certified balance) to the tank, the above display that read 100.0 kg before the fluid addition does not change. However, when another 0.4 kg is added, the display shows 101.0 kg. What would you recommend as the absolute error assigned to the measurement of the fluid weight using the above load cell/readout, based on this observation? Write the value that you would recommend as the absolute error in the space below (include units) c) A mass flow rate for the feed pump to the above tank is determined using the above load cell/readout and a digital stopwatch that shows only whole seconds. In ten seconds (as determined by the stopwatch) you found that the display changes from 500.0 kg to 550.1 kg. Using a "worst case" approach to error propagation, show the mass flow rate including the absolute error and units in the space below. Base your calculations on the absolute error that you recommended in b)
