ZDM
6
FM Rev. 11/10
4.0
Operating Instructions
4.1
Turning the Unit On
Supply power.
4.2
Flow Measurement
The ZDM transmits a frequency based electronic signal in response to flow
through its mechanism. This signal takes the form of a square wave, the
amplitude of which is the supply voltage (V
cc
) minus 1.0 VDC. A representation of
the waveform is given in Diagram 4.2.1, "ZDM Frequency Output Waveform", on
page 6. Each pulse in the transmitted signal represents a fixed quantity of liquid
passing through the meter. The exact amount of liquid represented by each pulse
is a function of the range of the meter. To determine the sensitivity of your meter,
consult Table 2, "Volume per Pulse for Various ZDM Ranges", on page 7.
Diagram 4.2.1:
ZDM Frequency Output Waveform
