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__________________________ MODEL 2234 DIGITAL FLOW COMPUTER
3.9
FREQUENCY DENSITOMETER OPTION
The frequency densitometer option enables the computer to determine line density
from a frequency output type of densitometer.
The densitometer signal frequency is determined by the computer periodically
reading the densitometer input counter and storing the total of accumulated pulses.
The pulses are accumulated for 18 seconds to attain satisfactory resolution. A
running average technique in the computer registers allows the calculated density
to be updated at three second intervals.
The computer calculates the corrected density in LBF3. The corrected density is
displayed using Read 0. Entering a FXD (operator entered) value provides an over-
ride of the calculated value.
3.9.1 CALCULATIONS
The computer calculates the corrected density in accordance with the following
equations. The Read Codes for entering the required terms (constants) to complete
the equation are shown at the end of the term definition. Set the "enable/disable"
switch to the "enable" position.
All constants are defined as fixed-only system constants and will default to zero
upon computer cold start unless otherwise noted.
SECTION 3
112
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