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Operation 4
NOTE:
Select FULL only when properly setup for performing automatic
calibration. See Section 3 Installation. The FULL selection is not
available on the battery operated portable model.
The calibration will initiate after releasing the UP or
DOWN arrows subject to the calibration delay period
which was entered in the CAL DELAY submenu
during SETUP.
NOTE:
In the battery portable model, manually switch over to zero or span
calibration gas to purge the sample cell before pressing the UP or
DOWN buttons.
The screen will indicate which calibration is to be
performed and then change to the countdown screen
indicating the time remaining in the CAL DELAY
function. The time remaining is shown in the upper left
of the display and "delay" is indicated at the lower
right. The concentration of the gas in the sample cell is
also displayed on the top row.
NOTE:
To optimize the CAL DELAY function, you can initially set the CAL
DELAY function to some high value, for example 120 seconds. Refer
to Section 4.2 for setting the CAL DELAY period. Then, time the
calibration while observing the display as it changes. Note the time in
seconds it takes for the concentration reading to stabilize. Add 10% to
this value and reenter it into the CAL DELAY submenu of the SETUP
menu.
After the CAL DELAY period has elapsed, the
calibration begins. Data is collected and averaged over
20 seconds. If an unstable reading is obtained, the
instrument will automatically recalibrate for another 20
seconds. The instrument will attempt a recalibration up
to 5 times and if it cannot find a stable calibration value
it will either restore the old calibration value or enter
into an alarm mode. See Section 6.3.1 for alarm
messages and procedures.
2. S
C
ELECT
The next submenu is used to select the chart output range the
instrument will use during analysis. The ranges can be user-
defined however the instrument will default to standard ranges
preset at the factory if no user-defined ranges have been setup.
See Section 4-2 for information on how to set up the chart
ranges. The analyzer is equipped with an autoranging feature
which will automatically select the correct chart range during
the measurement.
40
Teledyne Analytical Instruments., - Rev. 3
R
HART
ANGE
IR7000
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