AW Gear Meters EMO-3000 - Manual (Page 17)

EMO‐3000
Operation and Programming Manual
16
Ratio 1 +/‐ % = XXXXX.
Ratio 2 +/‐ % = XXXXX.
Ratio 3 +/‐ % = XXXXX.
Ratio 4 +/‐ % = XXXXX.
The Flow Margin operates as +/‐ the programmed amount before tripping the Limit. For instance, if Flow
Limit 1 is programmed to 100 cc/m and the Flow Margin 1 is programmed to 10cc/m, the Limit 1 turns
on anytime the Flow Rate goes below 90 cc/m or above 110 cc/m.
Ratio Operations
The EMO‐3000 can act as a Ratio Monitor by utilizing both the A (pin 4) and B (pin 3) frequency inputs.
This is especially useful in two‐component systems where a ratio must be maintained within a defined
margin.
The ratio calculation is based on the totalized volumes of fluid from Input A and Input B. The number of
pulses programmed in the Ratio Sample variable determines how often the calculation updates. When
the EMO‐3000 counts pulses from either flowmeter equal to the Ratio Sample, the Ratio calculation is
performed. The device uses this data to trigger Alarm and Warning limits under the Limit Rules for Ratio.
Ignore the Ratio Sample’s decimal point when programming the number of pulses (4.00 is a sample size
of 400 pulses).
ACTUAL RATIO = INPUT A TOTAL/INPUT B TOTAL
The EMO‐3000 performs this calculation when either Total A or Total B reaches the Ratio Sample
number first.
The ratio display screen shows the Flow Rates for A and B, the Ideal Ratio, and the Actual Ratio. The
Ideal Ratio is the ratio that should be maintained at the spray nozzle (paint or coating application) and
requires programming. The Ideal Ratio is under GENERAL A in the DM‐3000.
After programming, the EMO‐3000 compares the Actual Ratio to the Ideal Ratio and the Ratio Margin
Limits. If you would like warning or alarm functions for Ratio errors, program the Ratio Limits for the
allowable error. You may need to set the Input/Output pins for outputs for the Limit functions. Refer to
the Input/Output section on page 14.
Notice
Notice