Set Menu Passcode; Detector Messages And Warning States; Running Information And Fault Messages; Hart Communications Active - GasTech D-Guard2 Operator's Manual

13.4.7

Set Menu Passcode

Access to the detector's menu system can be protected via the
use of a 4-digit passcode. The default passcode is 0000 which
disables the protection. Setting any other number than 0000
will enable the protection system. Changes made here are
automatically saved. Use the 'up' and 'down' keys to
increment or decrement the numeric digit. Use the 'next' key
to select the next digit to change.
14.

Detector Messages and Warning States

During normal detector operation, the display indicates gas concentration values, and additionally, other operational
information such as sensor temperature, gas measurement units and communication status.
Under conditions where a detector fault or a measurement error has occurred, the display will indicate the condition
with a status message and icons.

14.1. Running Information and Fault Messages.

14.1.1

HART Communications Active

The digital communications Icon alternates between off and on whilst data packets are being received AND transmitted
successfully. If received or transmitted data packets fail, or if communication is not active, the icon will turn off.
During the detectors routine operation, internal checks are made to determine of the system is functioning within
normal limits. If a condition exists within the detector that could create unreliable measurements, the system fault
icon is displayed. The lower status bar indicates a message associated with the fault condition.
14.1.2

Detector Fault - Detector Over-Range

If the detector reading exceeds the full scale measurement
range by 10% the 'OVER RANGE' message is displayed and four
dashed markers show in place of the readout. Additionally, the
sensor fault icons is displayed since an over-range condition can
also be the result of a sensor failure.
Once a digit is changed, the save icon will show to allow the
change to be recorded. Selecting another digit or changing
the value of the current digit will change the save icon to the
'back' icon.
The saved passcode should be noted down for safe keeping
since access to the user menu is not possible if the security
system is active and an incorrect passcode is entered.
14.1.3

Detector Fault - Detector Under-Range

If the gas sensing element is producing a signal that forces the
reading into a negative state (possibly due to poor calibration or
damage), the display will indicate 'UNDER RANGE' in the lower
status bar, place 4 dashes in the readout area and display the
sensor fault icon.
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D-Guard