Vortex
20
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
Module detector type switch setting is correct and that the detector input is 4mA or
open circuit for a fire loop.ON
6. Provided that zero adjustment was successful, reconnect the sensor (for oxygen
detectors only) or connector (for fire detectors only).
7. For an oxygen detector, expose the detector to free mobile air. Ensure that the display
is showing GL and the current gas level reading. Allow this reading to stabilise.
For other gas detectors, apply calibration gas to the detector (normally half scale, but
must be greater than 20% of full scale). Ensure that the display is showing GL and the
current gas level reading. Allow enough time for the detector to settle (typically two
minutes).
For a fire detector, connect an ammeter into the channel circuit. Ensure that the
display is showing FL and operate a manual call point. If the circuit has no manual
call point, put a detector into alarm with a smoke canister.
8. Press the CAL button on the inside of the Display Module. The display shows the
reading that Vortex believes the detector is sensing.
9. Use the – (HOLD) and + (STEP) buttons to adjust the Reading display to the correct
reading:
For an oxygen detector in free mobile air calibrate to a reading of 20.9% Vol.
For other gas detectors, this should be the level for the applied calibration gas.
For other 4-20mA devices this should be the level for the applied condition.
For a fire detector, this should be the same reading as the ammeter in the
circuit.
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