The salinity sensor in the fish tank system, which we used during the Week 11 ex
ID: 969870 • Letter: T
Question
The salinity sensor in the fish tank system, which we used during the Week 11 experiment, reads 0.109 % saline, but the fish tank salinity should not exceed 0.07% saline. Assuming the fish tank system holds 256 mL water and that the DI solenoid valve has a flow rate of 5.8 mL/s, how long should the DI solenoid value be powered open (digitalWrite(diPin, HIGH);) to bring the fish tank salinity to the 0.07% salinity limit? Units are in milliseconds to match the delay function used in the MPIDE program; do not include units in your answer. Give your answer to zero decimal places.
Explanation / Answer
amount of Salinity in the fist tank system = 256*0.109/100=0.279 ( assuming water density =1 g/cc)
let t= time required
Volume added = 5.8mL/s* t= 5.8*t
Total volume= 256+5.8t
concentration = 0.07%
(256+5.8t)*0.07/100 = 0.279
256+5.8t= 0.279*100/0.07=398.57
5.8t= 398.57-256
5.8t=142.57
t= 142.57/5.8 =24 sec= 24*1000 milli seconds
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