Serinus 40 User Manual 2.2  
 
 
This field is used to correct the zero calibration setting on the NO
2
. 
This option should be used only when zero gas is running through 
the measurement cell. When this is stable activate the Zero 
Calibrate (NO
2
) field, a window will open with editable numbers. 
Leave the numbers at 0000.000 and select Accept.  
This menu allows the user to calibrate the pressure sensors (refer 
to Section 5.6). 
This field displays the measured manifold pressure during the last 
calibration (for NO reference). 
This field displays the measured manifold pressure during the last 
calibration (for NO
X
 reference). 
Cell temperature when the last span calibration was performed. 
The efficiency of the conversion of NO
2
 to NO, in the NO
2
 to NO 
converter. 
3.5.12  Manual Mode 
These items appear in the calibration menu when Calibration Type is set to Manual. 
Calibration Mode  
(Only accessible once 
instrument has completed 
warm-up) 
 
When calibration type is set to Manual the instrument’s 
operational mode can be chosen from the following:  
Measure: is the normal measurement through the sample port. 
Zero: this mode will take air through the calibration port so that a 
zero calibration can be performed. Data is flagged as zero data. 
Span: this mode will take air through the calibration port so that a 
span calibration can be performed. Data is flagged as span data. 
Cycle: performs a zero, then a span then returns to measure 
mode. The length of time spent measuring calibration gases is set 
in cycle time (below). 
The time period that the zero and then span ports will be selected 
when Calibration Mode is set to Cycle. Users can set the time 
from (5 to 59 minutes).