Integrators Guide - Light 93
© 2018 Nortek AS
The velocity is given by:
(vel_range/V_range)*V_out - vel_min = velocity
Where vel_range = full range of velocity, V_range = usually 0V to 5V, V_out = voltage outputted,
vel_min = minimum velocity.
Alternatively set up two equations (2 unknowns, slope and intercept) using mx + b = y, where x is
voltage and y is velocity. Knowing voltage and velocity in two scenarios will give m and b (use max
and min velocity and voltage). This gives you the full linear fit.
At zero flow the outputted voltage should display 2.5V. If not, there may be issues with grounding.
Example: The range is specified to +/- 1m/s. Voltage outputted is 1V, V_range is 5V. The velocity
would be: (2/5V)*1V-1m/s= -0.6m/s
4.2.1 Vector
Vectors can send out velocity signals as 0-5 VDC analog voltages. Here is what is required to enable
analog outputs:
A special wiring harness passes the analog voltages out to the external connector. The output
wires include three signal wires and one ground wire (which is shared with the RS232 ground). The
remaining wires are allocated to RS232 and power.
A special head configuration file where analog outputs is enabled is needed.
Enable analog outputs in the Vector software's planning menu (Advanced Tab). The planning
module controls data collection in the Vector the same, whether or not the analog outputs are
enabled.
Once in analog output mode, you can remove and reapply power as desired. When you reapply
power, the analog outputs resume. Allow a few seconds for the instrument to start up after you
apply power.
4.2.2 Vectrino
Vectrino can send out only velocity signals as 0-5 VDC analog voltages, 3 channels standard, one
for each velocity component. Here is what is required to enable analog outputs:
Enable analog outputs in the Vectrino software's planning menu. The planning module controls
data collection in the Vectrino the same, whether or not the analog outputs are enabled.
Once in analog output mode, you can remove and reapply power as desired. When you reapply
power, the analog outputs resume. Allow a few seconds for the instrument to start up after you
apply power.
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