CiDRA GVF-100 Gas Volume Fraction Monitoring System - Manual (Page 79)

Copyright © 2006 CiDRA Corporation Page 10-5
20639-01 Rev 03
output a pulse frequency or a number of pulses for one of the
following measurements:
- Speed of Sound (SOS): Outputs a frequency corresponding to
SOS.
- Gas Volume Fraction (GVF): Outputs a frequency corresponding to
GVF.
Menu options for configuring the output include a multiplier, a pulse
width, and a low cut setting (see descriptions below).
‘ ‘Multiplier’: A factor used to scale the pulse output where:
scaled pulse quantity = (pulse output parameter) / multiplier value
‘ ‘Pulse Width’: Sets the width of the Pulse output in seconds (0.5ms,
1ms, 20ms, 33ms, 50ms, 100ms).
‘ ‘Low Cutoff': Setting at 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 14 Maximum Pulse Per Second Based On Pulse Width
‘Output Sel’ - Used to select the measurement to be output.
The Info>Configuration>Pulse Output selection on the transmitter
menu displays the currently configured max/min pulse range, and will
indicate an over range condition if one exists. (i.e. settings exceed
maximum pulses per second capability).
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
Warning: Settings Produce > Max PPS!