AW Gear Meters EMO-500 - Manual (Page 17)

EMO-500
Operation and Programming Manual
16
Keys and Values
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 EMO-500 calculates the flow rate. 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 set as a percent deviation from the Ideal Ratio. The first meter to deliver the
number of pulses programmed as the SAMPLE AMOUNT triggers the ratio calculation. The calculation
compares the measured ratio to the Ideal Ratio; if the difference in percent exceeds the programmed
value, the warning activates.
F4 Alarm (Default Value = 10%)
Similar to the above Warning variable.
F5 DP (Decimal Point)
Use this key to locate the decimal point when programming the EMO-500.
F6 Enter
Use this key to lock in programmed values.
#0 Sample Size (Default = 200)
To determine the ratio, the EMO-500 separately counts the total number of pulses from both
flowmeters until the fastest one reaches the SAMPLE SIZE. The EMO-500 divides the number of pulses
flowmeter A produces by flowmeter B’s pulses, and the result is the ratio. The accuracy and response
time of the ratio calculation is therefore dependent upon the SAMPLE SIZE. The flowmeter with the
lowest pulse rate should produce 100 pulses before the ratio calculation updates to achieve a 1%
accuracy. The display screen #7 is an useful guide for this purpose.
#1 SG (Specific Gravity [Default = 1.0])
If needed, enter specific gravity values for each metered flow.