Max Machinery 289 Series Flow Meter Transmitters - Manual (Page 8)

( 7 ) 289-760-350 © 1987 (Rev 5/06) Max Machinery, Inc.
Maximum Transmission Distance
MAXIMUM TRANSMISSION DISTANCE (continued)
The graph below provides the relationship between output capacitance loading and rise and
fall time for the Model 289-763/773 output signal. For instance, with 0.4 µF the rise time of
the Model 289 is about 89 µS, and the fall time about 45 µS. Consequently, the absolute
maximum frequency the 289 could put out would be 1/(80 + 45) µS = 8000 Hz (frequency =
1/time). The signal would be a saw tooth pattern. Generally, the transmitter will drive 5000
feet or more of cable with no problem.