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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
10
F1 Ratio Default Value = 1.00
This function is the address of the IDEAL RATIO which represents the desired ratio
of FLOW A/FLOW B. The default is 1.00 which represents a 1 to 1 ratio.
F2 Gate Time Default Value = 1.85
The GATE TIME is the period of time, in seconds, during which the flow rate
calculation is made. The accuracy and response time of the flow rate display is therefore
dependent upon this value. To achieve a 1% accuracy, the slowest pulse rate should
deliver at least 100 pulses.
F3 Warning Default Value = 5%
The WARNING variable is available to set as a % deviation from the Ideal Ratio. The
ratio calculation is triggered by the first meter to deliver the number of pulses
programmed under the SAMPLE AMOUNT variable. The calculation compares the
measured ratio to the Ideal Ratio and if the difference in % terms exceeds the
programmed value, the warning is activated.
F4 Alarm Default Value = 10%
The ALARM variable is similar to the warning function.
F5 DP Decimal Point
This key is used to locate the decimal point when
programming.
F6 Enter
Locks in programmed values.
#0 Sample Size Default = 200
To determine the ratio the total number of pulses from both flowmeters are separately
counted until the fastest one reaches the programmed SAMPLE SIZE. The number of
pulses produced by flowmeter A is then divided by flowmeter B, and the result
determines the ratio calculation. The accuracy and response time of the ratio calculation
are therefore dependent upon the SAMPLE SIZE. The flowmeter with the lowest pulse
rate should produce 100 pulses before the ratio calculation is updated to achieve a "1%
accuracy. The display screen #7 is an useful guide for this purpose.
#1 SG Default = 1.0
Specific gravity values may be entered for each metered flow should quick corrections
be required in this value.