7
Triple Plus+ and Triple Plus+ IR Operation
the whole display with the warning. All instantaneous alarm types are latch-
ing which means that they may only be reset by pressing the UNMARKED
button when the gas hazard has passed. If set up for Time Weighted Average
(TWA) alarms, the Triple Plus+/Plus+ IR triggers a non-resettable alarm if
a short term (normally 15 minute) or long term (8 hour) exposure level is
reached. Both TWA alarm types may only be reset by turning the instrument
off and on again when the average exposure has fallen below threshold levels.
(See Configuring the instrument with Portables PC software on setting these
levels).
2.7 Status Screens/Alarm Reset
The UNMARKED button has two functions: to reset alarms (see 3.6 above)
or to display a series of status screens. To view the status screens press the
UNMARKED button when the instrument is not in an alarm condition.
The series of status screens show the following information in sequence. Press
the UNMARKED button to move onto the next screen, and eventually back to
the main instrument display of gas levels. If the button is not pressed for 20 sec-
onds the instrument will ‘timeout’ and return to the main gas reading screen.
The date, current time, and the time elapsed since instrument switch
on is displayed.
Serial number and calibration due date is displayed.
Alarm 1 levels are shown for all sensors.
Short-term exposure levels are displayed for toxic sensors.
Long-term exposure levels are displayed for toxic sensors.
Currently selected user and site are displayed.
2.8 Switching Off
Provided the facility has not been denied with the SETTING UP function, the
Triple Plus+/Plus+ IR may be switched off by pressing the ‘ON’ button and the
UNMARKED button simultaneously and holding them down for about half a
second. This prevents accidental switch off through knocking the keypad.
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