Rate Pulse Scaling
The rate pulse has a maximum frequency of 1000 Hz that is proportional to the minimum and maximum user flow rates
entered . Setting the minimum and maximum flow rates is accomplished using the
Meter > Limit
software controls .
For example, if the minimum flow rate were set to –100 gpm and the maximum flow rate was +100 gpm the 1000 Hz output
would span the distance from –100…100 gpm .
In this example the output frequency would then be interpreted as follows:
0 Hz = –100 gpm
250 Hz = –50 gpm
500 Hz = 0 gpm
750 Hz = +50 gpm
1000 Hz = +100 gpm
The maximum current capacity for the transistor is 100 mA with a maximum supply voltage of 10V DC . These parameters
require the pull-up resistor rated for a minimum of 1000 ohms .
In rate pulse output mode, the transistor has a duty cycle of 50% .
Totalizing Pulse
When used to transmit a totalizing pulse, the digital output sends a fixed width (33 mS) pulse that follows the display totalizer .
For each increment of the totalizer, the digital output sends 1 pulse . The duration of the pulse is 33 mS with an amplitude
approximately equal to the level of +V . See
to set totalizer parameters .
OTEE:
N
The totalizing pulse output can be set for total net, total positive, total negative, total Doppler, energy net, energy
positive and energy negative .
Inputs/Outputs
Page 86
November 2016
HYB-UM-00090-EN-04
