Crowcon T4 - Calibration

37
2.8.6 Calibration
i
T4 calibration via the menu must be performed utilizing Crowcon quad gas of the
following values H
2
S = 15ppm, CO = 100ppm, O
2
= 18%VOL and CH
4
= 50%LEL (2.2% VOL)
i
‘Allow calibration’ must be enabled for the calibration to operate via the menu function,
this can be congured utilizing Portables Pro 2.0.
i
A calibration can also be performed via Portables Pro 2.0 or via I-Test.
i
If utilizing gas extraction do not place the extraction outlet closer than 20cm to the
calibration/bump plate as this may result in an incorrectly calibrated T4.
The calibration function allows T4 to be calibrated at anytime.
X Before starting, ensure the calibration/bump test plate is not connected and that the instrument is
in clean air.
X With the home screen displayed, double click the operator button to access the menu functions screen.
X Single click the operator button repeatedly to scroll right until
the
menu icon is displayed and then double click the
operator button to select.
X The calibration countdown screen will then be displayed.
X To initiate a calibration press the operator button before the
countdown is complete.
X The zero countdown screen will then be displayed and a zero will
be performed when the countdown is complete.
X A successful zero of a channel will display a tick on the screen.
X If the zero is unsuccessful a cross will be displayed for each gas
that fails, the calibration will fail and, if congured, the +ve safety™
LED will be illuminated red.
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