AW Gear Meters EMO-500 - Manual (Page 11)

EMO-500
Operation and Programming Manual
10

Environmental: storage = -40°C to 85°C; operating = 0°C to 50°C; humidity = 10 to 90%, non-
condensing

Limits: 10 amp, 110 V dry contact relays
Display Information

Ratio (ideal): Flow Rate A, Job Total A, Grand total A

Ratio (actual): Flow Rate B, Job Total B, Grand Total B

Limit Settings: Flow Rate A+B, Job Total A+B, Grand Total A+B

Limit Status: Flow Rate A-B, Job Total A-B
Special Features
The EMO-500 is geared toward applications where the main interest is the ratio of components
dispensed over a period of time, for example in a batch, rather than monitoring on an instantaneous
basis. The unit is especially suited for use in dispensing systems with irregular flow patterns. The EMO-
500 features a programmable sampling size, which governs how often the ratio display updates and
provides maximum control over the sampling period. The EMO-500 is easy to adjust to suit system
parameters.
Helpful Information For Using the EMO-500
Sample Size
This is the number of impulses collected for the ratio calculation. 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. Default value is 200. The display screen
#7 is a useful guide for this purpose.
Gate Time
This is the time period over which the EMO-500 makes Rate Calculations. The gate time (in seconds) is
the time period during which the microprocessor collects pulses to perform rate calculations. Default
value is 1.85.
Serial Port Programming
You can program the EMO-500 through the serial port using RS-232- or RS-485-type communication.
Refer to the Serial Port Operations on page 31 for complete information.