AW Gear Meters RT-15 - Manual (Page 23)

RT‐15 Flow Monitor
Operation and Programming Manual
22
TOTAL A Rollover
RT‐15 JOB totals rollover to zero when the total reaches a value of 999999 regardless of the decimal
location. When a JOB total rolls over or is reset, the device adds the contents of the JOB total in memory
to the GRAND total.
GR TOTAL A Rollover
To allow retention of the largest possible GRAND total before data loss, after reaching a value of 999999
regardless of decimal location, a floating decimal feature automatically reduces decimal resolution by a
maximum of two decimal places before rolling over to zero and losing the total. For example, for a KFT
with four decimal places, the GRAND total reaches 9999.99 instead of 99.9999 before resetting to zero.
Total Mode Programming
Program the Total parameters from the TOTAL A display screen.
1. With the cover open, use the MODE/DN button (or magnetic switch) to select the TOTAL A
display.
2. Press and hold the ENT button (or maintain the ENT magnetic switch).
3. The display first shows a P in the lower left‐hand corner and then displays the first program
variable for the TOTAL display mode.
You can access two parameters from the TOTAL screen:
 KFT A VALUE
 ENG UNITS A
KFT A VALUE
This is a scaling factor to display totals in a desired engineering unit such as gallons. The KFT value you
enter from the TOTAL A screen also determines the decimal resolution of the total display. The RT‐15
calculates the KFT using the K‐factor of the transducer being monitored. The K‐factor is the number of
impulses per engineering unit established by the transducer manufacturer or by a calibration test. The
AW Gear Meters Calibration sheet stipulates the K‐factor and recommended KFT.
Initial default is: 10000. (displays total pulses with no decimals)
The KFT factor is calculated using the following formula:
KFT= 10000/K‐FACTOR
where:
 10000 is a constant
 K‐FACTOR is the average number of pulses per desired engineering unit that the transducer
produces.