Dynasonics D300_301 Series Doppler Ultrasonic Flow Meter - Manual (Page 26)

Rev. 2/00 -4.7- 300/301
the new count rate is 1.2 seconds per count at 10
gallons per count.
A digital counter is placed on the output of the circuit
card to measure the period between pulses so that at
a full scale of 500 GPM the CTR adjustment is set to
correspond to a 1.2 second period interval. The SW1
switch is only used if the customer wishes to set the
gallons per count rate higher (i.e. x 10, x 100, x
1000).
PART 4 - CONFIGURATION AND OPERATION