AW Gear Meters EMO-1005 - Manual (Page 54)

AW-Lake Company 8809 Industrial Drive, Franksville, WI 53126  web: www.awgearmeters.com
 Tel: 262-884-9800  Fax: 262-884-9810  Email: [email protected]
REV. 1a 05/98 EMO-1005 Manual.DOC
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APPENDIX L: EMO-1005 WITH BUILT-IN PNAO
When the EMO-1005 is modified to have a built-in PNAO module, the following items need to be taken into consideration.
The PNAO modification allows the EMO-1005 to receive quadrature input flow-meter signals and provide a ± 5 volt output depending on flow
direction. The voltage output is scaled using the KFA. When calculating the KFA, assume +5 volts for maximum forward flow over a flow
range of 0-5 volts. When flow is reversed, the same KFA value is used to determine the zero to negative 5 volt scaling.
Pins 3 and 4 of the EMO-1005 receive the two frequency inputs, with pin 4 referred to as frequency A and pin 3 referred to as frequency B. If
the PNAO output is opposite of what is desired, simply switch the connections to pins 3 and 4 on the EMO-1005.
The PNAO modifications do not affect the flow rate or totalization calculations of the EMO-1005. The flow rate displayed has no direction
associated with it. For example, if the system is running 5 gpm in the reverse direction, the EMO-1005 will display 5 gpm, not -5 gpm.
Furthermore, totals counted from flow in the reverse direction are added, not subtracted, to the various totalizers such as the current total and
grand total.
It is recommended that the milli-amp output not be used on an EMO-1005 that has a built-in PNAO. This is because the modifications made
for the PNAO alter the milli-amp circuitry somewhat.