AW Gear Meters RT-30EX - Manual (Page 28)

RT-30EX Flow Transmitter
Operation and Programming Manual
28
RT-30EX User Manual, Rev. 1.7 02/07/2012
Linearizer programming
The RT-30EX has a 30-point linearizer which can be used to increase the linearity of the flow rate
reading. When entering the Linearizer programming mode, the first question asked is if the Linearizer
should be activated. If the linearizer has already been programmed, de-activating the linearizer does
not erase any previously programmed table values. It only turns off the use of the linearizer and causes
the RT-30EX to use the single programmed K-Factor value under the Rate/Total programming menu for
its calculations. If the Linearizer is used, the minimum number of points required for programming is 2.
When programming the linearizer, each table point requires a frequency value and K-Factor to be
entered. To obtain these values it may be necessary to have a separate calibration done on the flow
meter ahead of time. Often this information can be found on the original calibration sheet from the
manufacturer.
Freq. variable
When populating the linearizer table, it is required that Point 1 has the lowest frequency and each
subsequent table point frequency must be in continuously increasing frequency value. The frequency
value represents the signal from the flow meter at each flow rate to be programmed into the linearizer
table.
K-F variable
The K-Factor is the scaling factor in Pulses per Gallon for each frequency programmed.
When the desired number of linearizer table points have been programmed on the next table point
leave the frequency value as zero and press
ENT . This is understood by the RT-30EX as meaning end of
table programming and saves the table values and exits the linearizer programming menu.
Clearing the linearizer table
To clear a previously programmed linearizer table, enter the linearizer table and change Point 1 Freq. to
zero (0). After pressing the
ENT button, the RT-30EX will display a warning that all table values will be
Activate Linearizer?
NO YES
Linearizer
Programming?
NO YES
EXIT
YES YES
Point 1
Freq. = 0000.000 Hz
> K-F = 00000.00 PPG
Point 1
> Freq. = 0000.000 Hz
K-F = 00000.00 PPG
ENT ENT
Figure 37: Linearizer activation screens
Figure 38: Linearizer variables