Re-Calibration Of Vortex - Crowcon Vortex Installation, Operation And Maintenance Manual

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
recalibration, 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.
MAINTENANCE
1. For a new detector, calibrate the detector first. For the calibration procedure, please
refer to the relevant Installation, Operating and Maintenance Instructions provided
with the detector.
2. Inhibit the channel by pressing the appropriate ZONE INHIBIT button on the back of
the Display Module. The calibration can be carried out without inhibiting the channel,
but associated relays and audible and visual alarms may be triggered.
3. Ensure that the associated detector is reading zero level (4mA for a gas detector):
 For an oxygen detector, the sensor must be disconnected from the current
amplifier at the detector head.
 For other gas detectors, the detector should be in free mobile air.
 For a fire detector, the fire loop current connector must be disconnected at the
Quad Channel Input Module.
4. Using the HOLD and STEP buttons, select the channel to adjust.
5. Once the display is held on the appropriate channel press the CHANNEL TEST
button on the inside of the Display Module. The display should show GL for a gas
detector or FL for a fire detector, and the detector level reading (this should be
approximately zero).
6. Press the ZERO button. The display should read 0. If there is an E008 fault, it
indicates that the incoming signal is too far from the nominal zero level to allow
compensation. Check that the detector is wired correctly and the Quad Channel Input
Module switch setting is correct.
7. Provided that zero adjustment was successful, reconnect the sensor (for oxygen
detectors only) or connector (for fire detectors only).
8. With Vortex not in Channel Test, press PEAK HOLD CAL to clear the memory.
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