Instruction Manual
Tek-LCD 7801C
www.tek-trol.com
Technology Solutions
44
6.15
Round Horizontal Tank
•
The Round Horizontal Tank (RHT) function calculates the volume of round tank with flat ends,
based on the diameter and length dimensions of the tank.
•
The input source for the channel calculating the volume must be a level channel with units of
distance (height). The RHT function linearizes the signal from a level transmitter and displays
the volume in engineering units. The graph in figure 28 shows the display response based on
tank example:
•
Diameter = 48”; Length = 120”
•
For this mode select [Round Horz Tank] from Function options.
Fig 28: Round Horizontal Tank Volume Graph
6.16
Open Channel Flow Application
The Tek-LCD 7801C, in combination with a level transmitter, makes for a practical way to measure
and display open channel flow rate and total in most weirs and flumes and take periodic samples.
There are two ways the user can program the Tek-LCD 7801C for open channel flow applications:
6.16.1
Programmable Exponent
•
In this method, all the user needs to do is enter the exponent for the weir or flume into the
Tek-LCD 7801C and the controller automatically raises the input signal to that power.
•
For instance, to display open channel flow rate and total from a 3
” Parshall flume and take a
one pint sample every 100,000 gallons, the user would program the Tek-LCD 7801C as shown
in the table 2.
