Teledyne T201 Manuel D’Utilisation

Calibration Procedure 

Analyzer Operator Manual 

16 

07271B DCN6646 

  

The analyzer can be zeroed by either applying zero air straight to the 
sample port or through the optional Zero/Span valves, if installed. It is 
important to remember that if the analyzer was previously sampling 
ammonia gas, prior to conducting a Zero calibration, it will take some 
period of time before the zero baseline is reached. The process of zeroing 
the analyzer consists of delivering dry zero air to the analyzer. The 
operator then manually zeros the TN

x

 and NO

x

 channels individually 

through the user interface. The following Tables outline the steps 
necessary to zero the analyzer.  

Important: Each channel (TN

x

 and NO

x

) must be zeroed individually 

1. Press 

CAL 

The T201 enters the calibrate mode from sample 
mode. Confirm zero gas is flowing past the sample 
port. 

2. Channel 

Selection 

Press 

 or NO

 then Press ENTR. 

3. Range 

Selection 

Press 

LOW or HIGH range then Press ENTR.  

Always calibrate the LOW range, section 3.0 below. 

4. NH

3

 STB Reading  Wait for the displayed stability reading to fall below

1.0 PPB. The lower the stability reading the better the
zero value.  

5. Press 

ZERO 

If you change your mind after pressing ZERO, you 
can still press EXIT without zeroing the instrument.
You don’t have to enter concentration values. The
analyzer knows to apply 0 PPB. 

6. Press 

ENTR Pressing 

ENTR actually adjusts the Offset value for 

the selected channel. 

7. Press 

EXIT 

The T201 returns to sampling mode. 

8. Check 

Concentrations 

/Offsets 

All displayed concentrations should read zero. The 
offset values should be close to zero (-20 to 150 mv)