8
the instrument is located in fresh air. Oxygen
sensor models should show 20.9 in fresh air.
or
2.1.1 Calibration due lockout
When the ToxiPro’s calibration due lockout
function is enabled and calibration is due, the
calibration due warning will be shown at
instrument start up and can not be bypassed.
The instrument must be calibrated
immediately before it will show any gas
readings. The calibration may be performed
manually, or by placing it in an IQ Express
Dock. Upon successful calibration, the
ToxiPro will proceed to the current gas
readings screen.
The calibration due lockout function can be
enabled or disabled with BioTrak software.
2.2 Backlight
The ToxiPro includes a backlight that is
automatically turned on during an alarm
condition. The backlight can also be
manually activated while the current gas
reading is displayed by pressing the MODE
button once. When manually activated, the
backlight will automatically turn itself off in
about twenty seconds. If activated by an
alarm condition, the backlight will remain on
until the instrument is no longer in alarm.
2.3 Functions
From the current gas
reading screen, press the
MODE button once to
activate the backlight.
Press MODE again to
scroll through the screen options.
Once the backlight has been lit, press MODE
once more to view the MAX gas values
screen. The MAX figure represents the
highest gas value reading that has been
recorded by the instrument during the current
operating session. ToxiPro O
2
models will
sequentially display both the highest and the
lowest readings that have been recorded by
the instrument in the current operating
session.
From the MAX screen, press the MODE
button to view the time screen. A dot below
the colon between the hours and the minutes
digits indicates afternoon/evening hours (pm).
10:45 am 10:45 pm
If the STEL (Short Term Exposure Limit)
alarm is enabled, press the MODE button
once to view the STEL reading. The STEL
value displayed represents
the average value of the
instrument readings for the
target gas for the most
recently completed 15
minutes of operation.
If the TWA (Time Weighted Average) alarm is
enabled, press the MODE button once more
to view the current TWA value. TWA values
are calculated by taking the sum of the
instrument readings for the
target gas for the current
operating session in terms
of parts-per-million-hours
and dividing by an eight-
hour period.
Note: Due to the nature of the TWA
calculation, the TWA value can
accumulate over time and may cause the
instrument to go into alarm. Sperian
Instrumentation recommends resetting the
TWA value at the beginning of any work
shift by turning off the instrument and
then turning it back on again.
Press the MODE button again to return to the
current gas readings screen.
2.4
Calibration and bump test due
notices
When the calibration due notice is enabled
and the ToxiPro is due for fresh air calibration
“0-CAL will be displayed at the bottom of the
current gas readings
screen along with the
triangular warning symbol.
When the calibration due
notice is enabled and the
ToxiPro is due for span
calibration the calibration
bottle icon will be displayed
at the bottom of the current
gas readings screen along
with the warning symbol.
The bump test due notice
is designed for instruments
that are processed in an IQ
Express Dock. When the
bump test due notice is
enabled and the ToxiPro is
due for a bump test, the calibration bottle
icon will be displayed at the bottom of the
