CiDRA SONARtrac PW VF-100 - Manual (Page 155)

20834-01 Rev 04 Page 8-11
Speed of Sound (SOS): Outputs a frequency corresponding to
SOS (systems with GVF).
Gas Volume Fraction (GVF): Outputs a frequency corresponding
to GVF (systems with GVF).
Quality (GVF or VF): Outputs a frequency corresponding to the
measurement system calculated quality metric.
Menu options for configuring the output include a multiplier, a pulse
width, and a low cut setting (see descriptions below).
8.3.2.1 Multiplier
The Multiplier is used to scale the pulse output where:
scaled pulse quantity = (pulse output parameter) / multiplier value
8.3.2.2 (Pulse) Width
(Pulse) Width sets the width of the Pulse output in seconds (0.5ms,
1ms, 20ms, 33ms, 50ms, and 100ms). Note: Recommended
minimum pulse width is 1 ms. At the 0.5 ms pulse width setting,
voltage swing across the solid state relay will be ~50% of power
supply voltage.
8.3.2.3 LowCut
Lowcut sets the level below which the Pulse output will turn off.
Care must be taken to configure the multiplier and pulse width to allow
the full range of the pulse output to be:
1. Measurable by the user’s equipment. There may be a limitation
on the minimum
pulse width the user’s equipment can detect.
2. Less than the maximum pulses per second allowed by the
transmitter.
The maximum number of pulses per second that can be output is
based on the selected (Pulse) Width (see table below):
Max Pulses = 500/Pulse Width
Table 1 Maximum Pulse Per Second Based On Pulse Width
Pulse Width
Pulse Per Second
Maximum
0.5 ms 1000
1.0 ms 500
20 ms 25
33 ms 15.15
50 ms 10
100 ms 5