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Calibration
Pre-Calibration
Pre-Calibration
4-8
42iQ Instruction Manual
7. Verify that t
< 2 minutes. If not, select a reaction chamber with a
R
smaller V
.
RC
8. Compute the diluent air flow rate as:
9. If F
turns out to be impractical for the desired system, select a reaction
O
chamber having a different V
Perform the following pre-calibration procedure before calibrating the
42iQ. For detailed information about the menu parameters and the icons
used in these procedures, see the "Operation" chapter.
Note The calibration and calibration check duration times should be long
enough to account for the transition (purge) process when switching from
sample to zero and from zero to span. This transition time is the time
required to purge the existing air.
Note Depending on the plumbing configuration and the instrument, data
from approximately the first minute of a zero calibration or check should
be disregarded because of residual sample air. Also, data from
approximately the first minute of a span calibration or check should be
disregarded because the span is mixing with the residual zero air.
1. Allow the instrument to warm up and stabilize.
2. Be sure the ozonator is enabled. If the ozonator is disabled:
a. From the Home screen choose Settings>Instrument Settings.
b. Press Ozonator Supply to toggle the ozonator to show Enabled.
V
RC
=
t
R
+
F
F
O
NO
=
-
-
F
F
F
F
D
T
O
NO
and recompute F
RC
▲
and F
.
D
O
▲
Thermo Scientific
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