AW Gear Meters EMO-1005 - Manual (Page 28)

AW-Lake Company 8809 Industrial Drive, Franksville, WI 53126  web: www.awgearmeters.com
 Tel: 262-884-9800  Fax: 262-884-9810  Email: [email protected]
REV. 1a 05/98 EMO-1005 Manual.DOC
27
THE EMO-1005 LINEARIZER
Some systems have un-linear transducers for the rate or frequency. To solve this problem the
EMO-1005 was developed with a ten point Linearizer that can be programmed with an error of +/-
12.7%.
USING THE LINEARIZER
The Emo-1005 Linearizer can be used with any of the channel mode selections listed. This means that
the unit can linearize the feedback frequency of a PID controlled system or correct for error of one
component in a two component ratio system. When the unit is turned on, the initialization process
designates whether the Linearizer is ON or OFF. If the Linearizer was previously being used then it
will be functional when the unit is again turned on. The un-linearized frequency input can be viewed in
the Status Display Mode. The Linearizer feature is used mainly in connection with "un-linear"
transmitters. There are plenty of transmitters around that show a variation in the K-factor with varying
rates. In order to use the Linearizer effectively the transmitter manufacture or supplier should supply a
calibration sheet that would look as follows (this is just an example):
FREQUENCY RATE K-factor ERROR
Hz GPM Imp/Gal %
10
.26 2037.7 -5.2
100 2.60 2157.7 +0.5
500 13.00 2100.0 -2.5
If the percentage of error is not shown it can be calculated using the average K-factor.