12
CALCULATING SCALE FACTORS
COUNT SCALING
The count scaler is a user programmable number which
determines the count value of each input pulse. It is used to
correct for a known amount of error (wheel wear, viscosity,
etc.) or to convert the incoming count signal into the desired
units of measure on the display (feet, gallons, yards, etc.).
The main counter and totalizer show whole (integer) counts;
the scaler retains fractional counts.
Count Scaler Range: 0.00001 to 9.99999
Default Count Scaler: 1.00000
Count Scaler (CS) Formula:
DPF
CS =
PPI
where:
DPF is the decimal point factor determined by the desired
decimal point position on the main counter and totalizer
display:
DISPLAY DPF
DISPLAY DPF
XXXXXX = 1
XXX.XXX = 1,000
XXXXX.X = 10
XX.XXXX = 10,000
XXXX.XX = 100
X.XXXXX = 100,000
(Use the counter decimal point menu to select the desired
decimal point position for the main counter and totalizer.)
PPI is the number of pulses per item from the sensor (times
2 if doubled count mode).
Example 1: A sensor produces 20 pulses per inch of material
travel. Calculate the count scaler required to indicate mate-
rial used in whole inches (XXXXXX).
1
CS = = 0.05000
20
Example 2: An encoder produces 120 pulses per foot.
Calculate the count scaler required to indicate material
usage in 1/100’s of feet (XXXX.XX).
100
CS = = 0.83333
120
(Select the XXXX.XX position on the counter decimal point
menu).
RATE SCALING
The 1/Tau rate meter calculates rate by measuring the time
interval between input pulses, converting to frequency, and
multiplying by the rate scaler. The rate scaler is user pro-
grammed to convert the count input pulse frequency into the
desired units for display (feet/minute, inches/second, boxes/
hour, etc.).
Rate Scaler Range: 0.00001 to 99999
Default Rate Scaler: 1.0000
Rate Scaler (RS) formula:
SEC x DPF
RS =
PPI
where:
SEC is the number of seconds in the rate time unit (items/
minute = 60, items/hour = 3600, etc.).
DPF is the decimal point factor determined by the desired
decimal point position on the rate meter display:
DISPLAY DPF
DISPLAY DPF
XXXXXX = 1
XXX.XXX = 1,000
XXXXX.X = 10
XX.XXXX = 10,000
XXXX.XX = 100
X.XXXXX = 100,000
(Use the rate decimal point menu to select the desired
decimal point position for the rate meter.)
PPI is the number of pulses per item from the sensor (times
2 if doubled count mode).
Example 1: A sensor produces 1 pulse per foot of material
travel. Display rate in whole feet per minute (XXXXX).
60 x 1
RS = = 60.000
1
Example 2: A flow sensor produces 400 pulses per gallon.
Display flow rate in tenths of a gallon per minute (XXXX.X).
60 x 10
RS = = 1.5000
400
(Select the XXXXX.X position on the rate decimal point
menu.)
