Operation Tetra
3.4 Cautions
Sensors may be adversely affected by exposure to silicones, lead compounds,
high levels of hydrogen sulphide and chlorine, and some industrial solvents.
3.5 Backlight
In low ambient light conditions, the backlight can be activated to illuminate
the display by pressing the BACKLIGHT button . To switch off the backlight
press the BACKLIGHT button again, or it will turn off automatically after a
configurable timeout period of 10, 20 or 30 minutes. Alternatively, the back-
light may be configured to remain on permanently, or to never timeout once
switched on. (See LIGHT in section 4.2, Configuration Options). In an alarm
condition, the backlight is automatically turned on.
3.6 Alarms
When the Detective+ encounters an alarm condition the red lights flash, the
beacons activate and the sounder emits a loud, fast bleep. Where permitted
instantaneous toxic gas alarms may be accepted by pressing the UNMARKED
button. In this case, the sounder is silenced but the red lights continue to flash.
With instantaneous alarms, the word 'ALARM' will flash next to the gas name.
Time Weighted Average exposure limit alarms will flash the whole display
with the warning. All instantaneous alarm types are latching 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
Detective+ 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 when the average exposure has fallen below threshold levels.
(See Configuring the instrument with Portables PC software on setting these
levels).
3.7 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.
Detective+ Operation
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