Teledyne T201 Manuel D’Utilisation

 

Maintenance Schedule

 

07271B DCN6646 

31 

18. After the Auto-Tune process is completed, verify that the “process” 

temperature is indicating that the desired temperature is stable and 
being regulated. 

The converter is now ready for operation. 

Since the T201 is an ammonia analyzer, the flow through the AutoZero 
orifice is especially important.  Check the AutoZero flow as follows: 

1.  This procedure should be performed with the sample pump running. 

2.  Remove the top cover of the analyzer. Locate the vacuum manifold at 

the center rear of the chassis.  Locate the 1/8” tube fitting located on 
the very left side, as viewed from the rear of the analyzer.  It will have a 
label of “0.010” indicating the flow orifice installed. 

3.  Remove the fitting and attach a calibrated flowmeter to the block fitting 

capable of measuring in the range of 500 cc/min.  The flowmeter 
should indicate a flow of 500 cc/min 

10%. 

4.  If the flow is outside this range (most likely lower, due to plugging): 

1.  Turn off the sample pump and instrument. 

2. Remove the 1/8” pipe-to-tube fitting and remove the ¼” sintered filter 

(p/n FL0000001).  This filter is meant to protect the orifice; it will 
usually become plugged and need replacement rather than the 
orifice.  Replace the filter, and then re-assemble the manifold.  
Restart the sample pump and recheck the flow. 



 

“SAMPLE IN” 

1000 +/- 10 % 

 



 

“TO CONV” 

1000 or 500, +/- 10 % 

When the analyzer is sampling TNx only, the 
bypass flow is measured. Therefore, the flow 
alternates between 500 and 1000 cc/min. This 
is the NOx channel. 

“FROM CONV”  

500 +/- 10% 

This is the TNx channel.