Справочник Пользователя для Advanced Wireless Solutions EMO-500

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

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.