PROGRAMMING CALCULATIONS
Totalizer Programming
Totalizer values can be expressed in any engineering unit of measure such as gallons, quarts, or liters . For each unit, a unique
scale factor must be programmed .
Totalizer scale factor
To determine the
Totalizer Scale Factor
(
Program Mode
1
), use the following formula:
Totalizer Scale Factor = 1/(Transmitter pulses per unit × Decimal Factor)
where:
Transmitter Pulses per Unit is the number from
“Table 3: Transmitter pulses per unit” on page 11
or the literature for your
particular transmitter/meter combination . The chart is expressed in gallons and liters . If you wish to read in other units, use
the appropriate conversion factor .
Decimal Factor (from 1.0 to .001) determines the resolution of the reading . If you wish to read to the nearest 1/10 unit, the
Decimal Factor would be 0 .1 .
Example: You have a model 35 RCDL meter with a PFT-2 transmitter that has a pulse output of 126 .7 pulses per gallon . You
wish to read the totalizer to the nearest tenth gallon .
1/(126.7 × 0.1) = 0.0789 (scale factor)
1 . Set the
Totalizer Scale Factor
(
Program Mode
1
) to 0.0789 .
2 . Set the
Totalizer Decimal Point Factor
(
Program Mode
2
) to 0.0 (one decimal place) .
Rate of Flow Programming
Rate of flow can be expressed in any engineering unit of measure for any time base such as gallons/minute, liters/second,
barrels/hour .
Rate scale factor
To determine the
Rate Scale Factor
(
Program Mode
4
), use the following formula:
Rate Scale Factor = (Seconds / Transmitter Pulses per Unit × Decimal Factor)
where:
Seconds is the number of seconds in the rate time unit . If you wish to read flow in units per minute, seconds would equal 60 .
If you wish to read flow in units per hour, seconds would equal 3600 .
Transmitter Pulses per Unit is the number from
“Table 3: Transmitter pulses per unit” on page 11
or the literature for your
particular transmitter/meter combination . The chart is expressed in gallons and liters . If you wish to read in other units, use
the appropriate conversion factor .
Decimal Factor (from 1 .0 to 0 .001) determines the resolution of the reading . If you wish to read the rate to the nearest 1/10
unit, set the
Decimal Factor
to 0.1 .
Before you program the
Rate Scale Factor
, you must set the
Rate Decimal Point
position (
Program Mode 4
) . This decimal point
corresponds to the decimal in the
Rate Scale Factor
number .
Example: You have a model 35 RCDL meter with a PFT-2 transmitter that has a pulse output of 126 .7 pulses per gallon . You
wish to read rate of flow in gallons per minute .
60 seconds /126.7 pulses per gallon × 1.0 = 60/126.7 = 0.473(rate scale factor)
1 . Set the
Rate Scale Factor
(
Program Mode 3
) to 0.473 .
2 . Since we are reading in whole gallons, set
Rate Decimal Point
(
Program Mode 4
) to 0000 .
3 . Since we are reading in whole gallons (no multiplier), set
Program Mode 5
to 1 .
Programming Calculations
Page 10
September 2017
REG-UM-00471-EN-07
