Vortex Manual Maintenance
Issue 7 December 2009 49
MAINTENANCE
7 MAINTENANCE
7.1 Detector Functional Testing
Crowcon recommends that you check detectors routinely to ensure correct calibration and operation.
For gas detectors, heads require recalibration at least every 6 months. Fire detectors should be tested
every 3 to 6 months. Site procedures may require more frequent testing.
For detailed instructions on the routine functional testing of detectors, please refer to the relevant
Installation, Operating and Maintenance Instructions provided with each detector.
7.2 Inhibiting input
During calibration (sections 3.8 and 7.3) or Channel Test (section 7.4), it is often necessary to inhibit
the inputs so that relays are not tripped.
Using the Display Module, a zone (a group of four channels on a Quad Channel Input Module) can be
inhibited by pressing the appropriate ZONE INHIBIT button on the back of the Display Module. To
return the zone to normal operation, press the ZONE INHIBIT button again
Using VortexPC, you can inhibit individual channels. See VortexPC Help.
When a zone or channel is inhibited, any alarm or fault condition detected on that channel is not
transmitted to the relays. The Zone Inhibit LED is lit if the zone or any channel within the zone is
inhibited.
7.3 Re-calibration of Vortex
Vortex does not normally require re-calibration. Calibration should be done whenever the following
occurs:-
• a detector is changed
• a new detector is added
• replacement of certain modules see section 7.7.
In other cases, you may wish to carry out re-calibration as a confidence check.
The instructions below are for the Display Module. If you are using VortexPC, the software has Zero
and Calibration Wizards to enable you to carry out the calibration easily.
To calibrate Vortex with a new detector, see section 3.8. A simpler procedure can be used for re-
calibration, or when a detector has been replaced. The PEAK HOLD CAL function provides a one-
person CAL facility. Vortex has a memory location for each of its twelve input channels. These
memories store the highest value seen on each channel.
The Zero Adjustment should always be done before calibration.
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