Vortex Manual Operation
Issue 7 December 2009 43
OPERATION
6 OPERATION
6.1 General
This section describes the use of the Vortex system for monitoring, and the display of faults and
alarms.
The system status can be monitored through the Display Module or through an external system using
the digital communications ports, for example, a Distributed Control System (DCS). The information
here is mostly concerned with the Vortex Display Module.
The operation of the sounder and relays depends on the configuration of the relay logic (section 4.5.3).
The details of systems configured by Crowcon are given in the Specification Sheet. For full details of
the displays and controls on the Display Module, see section 4.6.
6.2 Monitoring with the Display Module
In normal operation all the LEDs in the channel status display are OFF. The system cycles through the
channels, displaying each channel reading in turn for three seconds. The channel number is displayed
in green, and the reading for the channel is displayed in red. The units of concentration are displayed
by the illuminated green LED on the right of the Reading display.
For a gas detector, the concentration is displayed as %LEL (percentage of Lower Explosive Limit),
%VOL (percentage by volume) or PPM (parts per million). These units can be configured in
VortexPC.
NOTE: Detection occurs on all channels at all times. The display provides a view of the reading on
a particular channel. The channel is not affected by this operation.
For a fire detector, a row of dashes appears on the Reading display when that channel is displayed and
there is no alert condition. The word FIRE is illuminated on the green LED at the right of the Reading
display.
To stop the cycling through the channels, and hold the reading of a particular channel, press the HOLD
button when the channel is displayed. While the channel is held, the green LED next to the HOLD
button is lit.
While the Display Reading is held, you can step to another channel by pressing the STEP button until
the desired channel is displayed.
To return to the cycling display, press the RUN button. The Hold LED goes out.
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