Vortex
19
Vortex provides a number of internal and external earth terminals for safety earth and screen
terminations. See Appendix F for further information on earthing.
Vortex has been tested and found to be compliant with EMC regulations using the following
cable and gland configurations:
SWA cable and SWA glands with electrical termination of the armour to the casing
via the gland
Screened cable with the screen terminated inside the casing via a metal tag attached to
the gland, or terminated at the earth stud.
Screened cable using an EMC gland where the screen is terminated to the enclosure
via the gland The Vortex standard enclosure contains cable entries with knockout
plugs (18 at the top and 18 at the bottom). These can be fitted with a standard M20
cable gland.
3.7 Circuit Breaker
If the equipment is permanently connected to a mains supply then a circuit breaker must be
included in the installation, in order to comply with the requirements of EN 61010-1 (Low
Voltage Directive).
The circuit breaker must be close to Vortex and within easy reach of the operator. It must be
marked as the disconnecting device for the Vortex.
The circuit breaker must comply with the relevant requirements of IEC 947-1 and IEC 947-3.
The protective earth must not be disconnected even when the breaker is activated.
NSTALLATION
3.8 Zero adjustment and calibration of Vortex
3.8.1 General
Calibration must be carried out separately on the individual detectors and on associated Quad
Channel Input Modules in the Vortex system. Calibrate the detector first, for the calibration
procedure, please refer to the relevant Installation, Operating and Maintenance Instructions
provided with the detector. Ensure at all times that local legislation and codes of practice are
complied with.
Calibration gas and accessories are available from Crowcon.The instructions below use the
Display Module. Ensure that you are familiar with the Display Module functionality (section
4.6) and the Channel Test Mode (section 7.4) before commencing.
If you are using VortexPC, the software has Zero and Calibration Wizards to enable you to
carry out the calibration easily. For Vortex DIN, this is the only method. See VortexPC Help
for details.
If you are calibrating a Quad Channel Input Module and detector for the first time, Crowcon
recommends that two people are involved. One person should be at the detector and the other
at the control panel. When gas is applied to the detector in the field the person at the control
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