Serinus 44  User Manual  3.0 
 
 
flow path to the reaction cell or bypasses out the Exhaust Port.  
On = Flow from C to NC (NOx flow path to Reaction Cell). 
Off = Flow from C to NO (NOx flow path bypassed to Exhaust Port). 
Indicates if the Nx Select valve on the Auxiliary Valve Manifold is Off 
or On. This valve switches the sample either straight through the Nx 
flow path to the reaction cell or bypasses out the Exhaust Port.  
On = Flow from C to NC (Nx flow path to Reaction Cell). 
Off = Flow from C to NO (Nx flow path bypassed to Exhaust Port). 
Indicates if the Measure/Background valve on the Auxiliary Valve 
Manifold is Off or On. This valve determines whether the sample is 
pre-reacted with ozone before arriving at the reaction cell. This creates 
no reaction in the reaction cell and enables a ‘Background’ 
measurement to be taken.  
On = Flow from C to NC (NO flow path to Pre-Reaction). 
Off = Flow from C to NO (NO, NOx and Nx flow path to Reaction Cell). 
 
3.4.16  Tests Menu 
Main Menu  Service Menu  Diagnostics Menu  Tests Menu 
Performs a screen test by drawing lines and images on the screen so 
that the operator can determine if there are any faults in the screen. 
Press a keypad key to step through the test. 
The up and down arrow keys will adjust the contrast. 
 
3.4.17  Digital Input Test Menu 
Main Menu  Service Menu  Diagnostics Menu  Tests Menu  Digital Input Test Menu 
Displays the status of the 0-7 digital input pins. Value will be 0 or 1. 
 
 
 
3.4.18  Digital Output Test Menu 
Main Menu  Service Menu  Diagnostics Menu  Tests Menu  Digital Output Test Menu 
When started will automatically step through each output, turning it 
On and Off. 
Displays the state of the output pin (On or Off) and allows the user to 
manually set the state. 
 
Note: Entering either the Digital Inputs Menu will temporarily disable all digital and analog 
input/outputs. This will affect logging via these outputs. Exiting the menu restores automatic control. 
Note: Entering either the Digital Outputs Menu will temporarily disable all digital and analog 
input/outputs. This will affect logging via these outputs. Exiting the menu restores automatic control.