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4.1 Test
Sequence
Once the instrument has been
recognized, the fresh air / zero calibration
will begin automatically.
Performing the
fresh air calibration in a contaminated
atmosphere will lead to inaccurate
and potentially dangerous readings.
The IQ Express must be located in a
fresh air environment containing
20.9% oxygen and no toxic gases
during calibration. If fresh air is
unavailable, a cylinder of “zero air”
containing 20.9% oxygen and 0 PPM
toxic gases must be connected to the
fresh air port with a demand flow
regulator and a piece of tubing
whenever an instrument is in the IQ6
Dock .
Once the zero calibration is complete,
the dock will flow gas to the instrument in
order to perform the “bump” test. The
bump test will be bypassed in favor of
immediate calibration if either the dock’s
or the instrument’s calibration due
interval has been exceeded.
The PHD6’s calibration interval setting is
contained in the Reminders/Lock
submenu of the Calibration menu.
Once the instrument responds to the gas,
the dock will analyze the response to
determine if the instrument passes the
bump test.
The gas detector will pass the bump test
if the sensor response to the gas is within
10% if the reading is lower than the
expected sensor output or within 20% if
the reading is higher than the expected
sensor output. If the bump test is
passed, the dock will proceed to the
alarm tests.
If the instrument fails the bump test or if
the instrument’s calibration due date has
passed, the dock will automatically
bypass the bump test and proceed to a
full instrument calibration without further
input from the user.
Following successful bump test or
calibration, the dock will test the
instrument’s alarm systems.
If all alarms are operational, the following
screen will be shown.
See section 4.3 for further details on
assessing test failures.
If all tests have been passed, the
following screen will be shown.
Remove the detector from the dock. The
detector is now fit for use.
Once the detector is removed from the
dock, the dock will reset itself and
prepare itself for the next instrument. In
approximately 10 seconds the display will
show the READY screens. The dock is
then ready for the next detector.
4.2 Loss of IrDA Connection
In the event of a loss of communication
between the dock and the instrument, the
LCD will first indicated that the IrDA is
not responding.
If the PC fails to reestablish the
connection, the LCD will indicate
“Connection Lost”.
Remove the instrument from the dock.
The dock should reset itself in
approximately 10 seconds.
“IrDA Busy” may also be shown.
4.3 Test
Failures
Failures can occur for a number of
reasons. When a fault occurs, the
reason for the failure will be shown on
the dock’s LCD. If the Express Software
is running and the dock is properly