15
SETSPAN
PRESS
INDUSTRIAL
SCIENTIFIC
TMX412
OXYGEN
LEL/CH4
E
BATT
0
2 10
0
0
*
6.
C
HANGING
I
NSTRUMENT
S
ETTINGS
Instrument settings, including alarm values, calibration gas
concentrations and security code, may only be accessed
and changed during the instrument startup sequence.
A keypad overlay is supplied to reveal the location of the
hidden keys used for changing instrument settings.
Remove the overlay from the protective backing and place
it over the instrument faceplate. The clear portion of the
overlay will cling to the display window of the faceplate
and may be reused.
To access the instrument menus:
• Turn the TMX412 off and back on again.
• When the display shows the warm up timer, press the
plus (+) and minus (-) keys simultaneously.
If the instrument security code has been set to a value
other than “0”, the CODE screen will be displayed along
with the scrolling prompt PRESS (+) OR (-) TO SET (E)
TO ENTER. Use the (+) and (-) keys to input the correct
security code value and press (E). When the correct code
has been entered successfully, the instrument will
immediately enter the settings mode.
The settings mode consists of three main functions in the
following order:
SETSPAN
ALARMS
BATTERY
CODE
The scrolling prompt, PRESS (+) FOR NEXT (E) TO
SELECT appears on each screen. Press the (+) to step
through the list and (E) to select any of the main functions.
Pressing the MODE switch at any one of the main
function headings will cause the instrument to return to the
normal operating mode.
6.1 S
ETSPAN
The SETSPAN function allows the user to set the
combustible sensor monitoring range to either LEL or CH
4
and to set the calibration gas values for the combustible
and toxic sensors.
• Press (E) to enter the SETSPAN function. The display
will show LEL along with the prompt PRESS (+) TO
CHANGE.
14
• At the completion of the oxygen sensor span operation
the instrument will emit a short beep and the display will
indicate GO CAL and the message PRESS (E) to CAL
will scroll across the bottom of the display. Press (E) to
continue calibrating the remaining sensors. Ignoring this
message will result in the instrument returning to the
normal operating mode in approximately eight seconds.
• When the GO CAL prompt has been acknowledged, the
instrument will display the first sensor to be calibrated
along with the span gas value. The message APPLY CAL
GAS will scroll across the bottom of the display.
NOTE: APPLY CAL GAS means connect the calibration
cup to the appropriate calibration gas cylinder.
Place the calibration cup on the instrument as
shown. Turn on gas supply.
• Apply the appropriate concentration of calibration gas.
The instrument will wait for three minutes to sense that
calibration gas has been applied before aborting and
failing calibration. When the instrument senses a
concentration greater than 50% of the span gas setting
the display will indicate the current full span value for
that sensor. The message CAL IN PROCESS will scroll
across the bottom of the display.
• When calibration of the sensor has been successfully
completed, the instrument will automatically step to the
next sensor to be calibrated and the preceding step will
be repeated.
• When all sensors have been calibrated successfully the
instrument will emit a short beep. The sensor
configuration will be shown on the display and sensor
identifiers will flash to warn of marginal calibration.
Marginal calibration will occur if the sensor full span
value is less than 70% of the applied gas concentration.
A marginal sensor calibration may be an early warning
sign that the sensor will soon need to be replaced.
NOTE: If the sensor full span value is less than 50% of
the applied gas value, the sensor will fail
calibration and the instrument will immediately
return to the real time READING mode. When
failed calibration or low sensitivity is indicated,
verify that the calibration cylinder has not
emptied or that the cylinder expiration date has
not passed.
• After displaying the sensor configuration, the
instrument will automatically return to the real time
READING mode.
GO CAL
PRESS
25 LEL
APPLY
Содержание TMX412
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