Christopher Marquart, PE

Thorsten, 

Your improvement worked! Thank you VERY much!!! Truly appreciate the assistance!!!!!!!

Best Regards,

Chris

Using formulas with trended data (temperature) I created a signal representing the density of a fluid in a vessel. I have reason to believe ambient conditions are impacting the temperature of the liquid inside of a level bridle thus changing the liquid properties. Using level measurements in the vessel and level bridle and the density/ specific gravity calculated for the liquid in the vessel (based on actual vessel temperature) I was able to calculate the density/ SG of the of the liquid in the level bridles based on the variation in level measurement.

The equation for density is fairly complicated so manipulating the equation solving for temperature isn't a realistic option for me. Is there a way to have Seeq calculate/ trend a signal representing the temperature when I have a signal representing the solution (density) with temperature being the only variable?

The equation I'm working with is shown below. I have the values for all of the constants and I'm wanting Seeq to calculate the value of T.

New to Seeq... trying different things to see what works and reached the point where I need to ask for help!

I have a temperature signal representing the temperature inside of a vessel. I'm wanting to modify this signal for a user determined time frame each day representing a potential temperature delta between a vessel and a level bridle. I was hoping to get help on the following items:

1) Is there a more efficient method of doing this? Wanting to have a code that can be easily updated for time frames & rate of increase.

2) I had to use .move(5h) to shift the signal to start at midnight. How do I get it to start at the beginning of each day every day?

3) For some reason during the 11pm hour (hour 23) there is a short blip with a magnitude equaling the total temperature increase over the user specified time and I can't figure out why. For Example, starting at 10am the new temperature will be 1.25F greater than the trended signal ($t). The temperature continues to increase 1.25F per hour until 6pm for a total increase of 10F over the 8-hour duration. The blip starting at 11pm represents a 10F increase over roughly 15 minutes and then a 10F decrease in roughly the same time period. 

Thanks in advance! 

Code is as follows:

$TimeToIncrease = 10 //hour of day temperature starts increasing
$TimeToStopIncrease = 18 //hour of day temperatu re stops increasing
$TimeToStopDecrease = 21 //hour of day temperature stops decreasing

$IncreaseMultiplier = 1.25°F //Rate of increase per hour
$DecreaseMultiplier = (($TimeToStopIncrease-$TimeToIncrease)*$IncreaseMultiplier/($TimeToStopDecrease-$TimeToStopIncrease)).SetUnits('F') //Calcualted rate of decrease per hour

$DayHours = (hours().toSignal('Hour',startkey()).within(days()).move(5h)) //Had to move 5 hours to start at midnight. Hours()=0 was 7pm without this. 

$Condition1 = ($DayHours >= $TimeToIncrease) And ($DayHours <=$TimeToStopIncrease)
$Condition2 = ($DayHours > $TimeToStopIncrease) And ($DayHours <=$TimeToStopDecrease)

$IncreaseTempSignal = $t+(($DayHours-$TimeToIncrease)*$IncreaseMultiplier).SetUnits('F')
$DecreaseTempSignal = $t+(($TimeToStopDecrease-$DayHours)*$DecreaseMultiplier).SetUnits('F')

$t
.splice($IncreaseTempSignal,$Condition1)
.splice($DecreaseTempSignal,$Condition2)