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AW Company 8809 Industrial Drive, Franksville, WI 53126 à web: www.awcompany.com
Tel: 262-884-9800 Fax: 262-884-9810 | Email: aw@awcompany.com
REV. 4 10/05 EMO-500 Manual.DOC
18
EXPLANATIONS OF THE GLOBAL VARIABLES
1. KFR for A.....Default 100.0
In order to make the EMO 500 display the correct rate in an engineering unit such as
GPM, a scaling factor must be calculated. This Rate Scaling Factor is called the KFR.
The KFR is calculated using the K-factor of the flow transmitter being monitored. The
K-factor is the number of impulses per engineering unit established by a calibration
test.
For example: A flow meter could have a K-factor of 6304 imp/Gal
. In order to calculate
the KFR multiplier for the EMO 500 apply the following formula:
6000 100 is the constant for seconds
KFR= 6000 is the constant for minutes
K-factor 360000 is the constant for hours
This KFR is the number that should be entered in the Globals Programming section. The
K-factor is the number published by the manufacturer as the average K-factor for the
transmitter.
For Example: A flow meter has the K-factor 2053.7 imp/GAL and the display should
show Gallons/minute
.
6000
KFR= = 2.921 GPM
2053.7
The number 2921 would be entered as the respective KFR and the DP (decimal point)
key would move the DP to the number 2.921.
NOTE: We recommend removing the insignificant decimal numbers often produced
by calculator mathematics. These present a misleading level of precision in the display.
We recommend using a maximum of 4 digits regardless of the decimal point
position.
Example: for 60.675 enter 60.67
for 2.3456 enter 2.346
NOTE: The largest number that can be entered as a KFR is 65000 ignoring the
decimal point position. Therefore 7.3456 will fail to be accepted as too large. A
message will alert the user if this should occur.