Zero Adjustment And Calibration Of Vortex; General; Zero Adjustment And Calibration Procedure - Crowcon Vortex Manual

Installation
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 panel can check
that the detector is connected to the correct Quad Channel Input Module by observing the gas reading
on the Display Module or on the connected PC.

3.8.2 Zero Adjustment and Calibration procedure

To adjust the zero and calibrate the Quad Channel Input Module for a channel using the Display
Module buttons:
1. Inhibit the Quad Channel Input Module of the channel to be calibrated 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.
2. 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 intelligent oxygen detectors refer to the Installation, Operating and
Maintenance Instructions supplied with the detector.
• For other gas detectors, the detector should be in free mobile air.
• For other 4-20mA devices ensure that the input is 4mA.
• For a fire detector loop, disconnect the fire loop current connector at the Quad Channel Input
Module.
3. Using the HOLD and STEP buttons, select the channel to adjust.
4. 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).
5. 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, the Quad Channel Input
14
Issue 7 December 2009
Vortex Manual