Zero And Span Check - Thermo Scientific 42iQ Instruction Manual

Calibrate NO
Zero and Span
Thermo Scientific
2. Verify that the high NO
the high NO calibration gas concentration plus any known NO
impurity.
3. Enter the NO
and then press Calibrate to calculate and save the new high range NO
span coefficient based on the entered span coefficient.
High
Use the following procedure to calibrate the NO
2
calibration gas.
1. Adjust the O
produce a decrease in the high NO concentration equivalent to about
80% of the URL of the high NO
90% of the high NO concentration determined in the
High" procedure.
2. Press the Back button to return to the Calibration menu and choose
Calibrate High Range NO
The user sets the span concentration by pressing the Edit Span
Concentration button. The Calculated High Range NO
Coefficient button will show what the span coefficient will be set to if
the Calibrate button is pressed.
3. Set the high NO
NO
2
pushbuttons, and then press Calibrate to calculate and save the new
high range NO
The analyzer requires initial and periodic calibration according to the
procedures outlined in this manual. Initially, the frequency of the
Check
calibration procedure should be determined by the stability of the zero and
span checks, which may be run daily. You should generate a new
calibration curve when zero and span checks indicate a shift in instrument
gain of more than 10 percent from that determined during the most recent
multipoint calibration. You can adjust the frequency of calibration and
even zero and span checks appropriately as you gain confidence with the
instrument.
It is recommended to have a quality control plan where the frequency and
the number of points required for calibration can be modified on the basis
of calibration and zero and span check data collected over a period of time.
calibration gas concentration is the same as
x
calibration gas concentration using the pushbuttons,
x
generator in the GPT system to generate sufficient O
3
2
calibration gas concentration to reflect the sum of the
2
concentration generated by GPT and any NO
span coefficient based on the entered span coefficient.
2
channel to the NO
2
range. The decrease must not exceed
2
Span Coefficient.
42iQ Instruction Manual
Calibration

Zero and Span Check

2
x
2
to
3
"Calibrate NOx
Span
2
impurity using the
2
4-21