AW Gear Meters EMO-500 - Manual (Page 29)

EMO-500
Operation and Programming Manual
28
Another method is to change the default Gate Time value by trial and error until achieving the best
results.
9. Analog Offset (Default 0000 )
The Analog Output Offset is a number from 0000-4095 that becomes the bottom end of the 0 - 5 volt
and 4 - 20 mAmp analog outputs.
For example:
0000 for 0 to 20mAmps and 0 to 5v.
819 for 4 to 20mAmps and 1 to 5v.
1638 for 8 to 20mAmps and 2 to 5v.
2457 for 12 to 20mAmps and 3 to 5v.
10. Analog Gain (Default 10200)
The analog gain factor integrates the controller output range and speed with the rest of the system
capabilities. If the gain factor is correct, the full range of the analog output signal can be used to cover
the operating range of the equipment in which it is installed.
Use this formula to determine the analog output:
(Variable Value) X Gain
512
The Analog Output arrived at above should be a number from 0000-4095, which drives a D/A converter
for a 4 - 20 mAmp and a 0 - 5 volt output on Pins 7 and 8 of the 9 Pin connector. Therefore the gain
factor can be estimated by re-arranging the analog output equation as follows:
(512) (Analog Out)
Variable Value
If the desired maximum output of the system is achieved at 5V or 20 mAmp, this is equivalent to an
Analog Out value of 4095 and the above equation would read:
(512) (4095)
Variable Value
The “Variable Value” is the true flow rate or volume capability of the system measured at the analog
value discussed above and therefore depends upon the ANALOG RULE selected. The Analog Rule is
discussed further below.
Analog Ouput =
GAIN =
GAIN =