CiDRA GVF-100 Gas Volume Fraction Monitoring System - Manual (Page 81)

Copyright © 2006 CiDRA Corporation Page 10-7
20639-01 Rev 03
The following table lists the alarm parameters with their default values.
Alarm Parameter Condition User
Entry
Warning
Default Value
Critical
Default Value
TMP> Y > 80 °C > 90 °C
Band Temperature
TMP< Y < 0 °C < 0 °C
SPL> Y > 200 dB > 200 dB RMS Sound Pressure
Level
SPL< Y < 50 dB < 80 dB
Speed Of Sound Quality SSQ< Y < 0.03 < 0.01
Event log updated LOG N
Sensor overload OVL N
GVF> Y > 100 % > 100%
Gas Volume Fraction
GVF< Y < 0% < 0%
Sensor Failure FAIL N
Table 15 Alarm Triggers
Note: The alarm trigger for Gas Volume Fraction (GVF) can be set
from the transmitter menu. All other values must be set using
SONARtrac Basic (or higher level) user program.
Up to three alarm triggers can be selected. For example, an alarm
output may be programmed like this:
Warning = TMP I LOG I GVF
(Warning = Band Temperature or Event Log Updated or GVF)
Critical = FAIL I OVL & LOG
(Critical = Sensor Fail or Sensor Overload and Event Log Updated
The menu inputs for setting ‘Alarm’ are described in the following
paragraphs.
‘Alarm Control’ menu is used to activate the ‘Warning’ and ‘Critical’
alarm functions. Once turned ‘On’ it is used to select the parameters
the alarm will activate on (refer to Table 16).
The ‘Manual Clear’ function under ‘Alarm Control’ has options of
‘Disable’ and ‘Enable’. In the ‘Disable’ mode the alarm will
automatically clear when the alarm condition no longer exists. In the
‘Enable’ mode, the alarm must be reset manually by opening the front
door of the transmitter and pressing the ‘Exit’ button. Note: For
transmitters installed in Class I Division 2 area follow established
safety procedures prior to opening transmitter door.
WARNING
For Class I, Division 2 applications, follow established safety
procedures prior to opening transmitter door.
The ‘Alarm Warn Threshold’ and ‘Alarm Crit Threshold’ menu
selections are used to set the flow rate and gas volume fraction alarm
set points. All other parameters must be set using the Configure
menu options in SONARtrac Basic Program.