9
CO
H2S
02
LEL
CO
H2S
02
LEL
10
O
0
21.0* 0
4.2 T
URNING THE
TMX412 O
N AND
O
FF
• Press and hold the MODE switch. The display will read
HOLD and the instrument sounds a short beep
approximately once a second.
• Continue holding the MODE switch until the RELEASE
screen appears. (Stop here if turning the instrument off.)
• After the instrument is turned ON, the following startup
screens will be displayed:
SENSOR CONFIGURATION. The type of sensors
installed in the instrument will be displayed.
WARM-UP TIMER. The display will indicate the
number of seconds remaining until the instrument begins
normal operation.
After the warm-up sequence has been completed, the
TMX412 will enter the normal operating mode and will
be continuously monitoring all calibrated sensors.
4.3 D
ISPLAY
B
ACKLIGHT
The display backlight is automatically switched on when
the TMX412 is in an alarm condition. To manually
activate the backlight when needed, press and release the
(E) key. The backlight will illuminate the display for
approximately 15 seconds.
4.4 TMX412 O
PERATING
M
ODES
The TMX412 offers different operating modes for
accessing various instrument features. To scroll through
the operating modes, press and release the MODE switch
The operating modes will be accessed in the following
sequence:
4.4.1
READING
This is the normal operating mode. The current reading of
all sensors is displayed along with the graphical battery
charge indicator.
4.4.2
SENSOR CONFIGURATION
This mode will display the type of sensor in the position in
which it is installed in the instrument.
HOLD
RELEASE
8
4.
I
NSTRUMENT
O
PERATION
4.1 C
HARGING THE
B
ATTERY
CAUTION: If the TMX412 is using the nickel-
cadmium battery pack, fully charge
the battery pack prior to use.
NOTE: The TMX412 must be turned off while charging
the battery.
A single unit compact trickle (10 hour) charger is available
for charging the battery in the instrument. In addition to
the compact charger, Industrial Scientific offers a full line
of chargers with dual rate (4.5 hour) or trickle charging
systems in single, dual or four unit configurations. All
chargers are capable of charging the battery in or out of
the instrument. All dual rate chargers offer the user
selectable discharge-before-charge feature to prevent
battery memory conditions caused by some repetitive use
patterns. Refer to Section 12, Options and Ordering
Information, for a complete listing of available chargers.
When charging the battery pack in the instrument, be
certain that the instrument is turned off and place it on the
battery charger. To charge the battery pack out of the
instrument, remove the pack and place it on the charger.
A fully charged battery pack will operate a four-gas
configured TMX412 for up to 10 hours. When the
instrument is in the normal viewing mode, an eight-
segment battery status indicator continuously displays the
battery condition. Each segment represents approximately
one hour of operating time. When the battery is fully
discharged, the display reads BATTERY FAIL and the
instrument emits a short beep once a second. Turn off the
instrument and recharge the battery pack when BATTERY
FAIL appears.
!
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