Instruction Manual
Tek-LCD 7801C
www.tek-trol.com
Technology Solutions
48
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After creating the On-Of Control with Randomizer channel, assign this channel as the input
for the relay controlling the pump.
6.19
Open Channel Flow
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The built-in math formulas in the Tek-LCD 7801C makes the setup of open channel flow
applications an easy task.
•
All you need to know is type of device being used and the formula for calculating the flow
rate using the head height.
•
The first thing to do is to create a channel for measuring the head height of the weir or
flume.
•
This example shows the setup for a 3" Parshall Flume with a maximum head height of 3ft.
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Scale the 4-20mA input.
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Select the type of weir or flume installed.
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Enter the constant K, the channel used for measuring the head height and the specified
exponent.
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Select the flow rate units.
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The Controller calculates the flow rate in the specified engineering units.
•
The units can be changed at any time without making any other changes.
