Crowcon T4 - Alarm and status icons

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The TWA Resume function can be activated during the start up sequence.
Upon start up, following the test screen, if T4 is switched on within 8
hours of being switched off, the screen shown right will be displayed
for 10 seconds allowing the user to ‘resume’ if required.
Simply click the operator button.
If T4 is now being used by a new operator and the TWA Resume function is not required do not click
the operator button and allow countdown to expire. This will reset the STEL, TWA and peak values
back to zero.
* Patent pending - UK Patent Application Number 1501699.1
2.4 Alarm and status icons
The alarm status is represented by the icons shown in the table below:
Icon Description Action
Status OK No action required
Fault status Refer to Section 6 for troubleshooting
Long term exposure alarm
(TWA)
Follow site procedure
Short term exposure alarm
(STEL)
Follow site procedure
Alarm 1 Follow site procedure
Alarm 2 Follow site procedure
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