Teledyne 200AH Manuale Utente

 

If a leak checker is not available, it is possible to leak check the instrument using the M200AH's 
pump plus a shut-off valve.  

1.  Turn off instrument power and pump power. 

2.  Cap the sample inlet port, ozone generator air inlet, and zero air inlet (if Z/S valve option 

present).  

3.  Insert a shut-off valve between the sample pump and the vacuum manifold at the rear of the 

instrument. 

4.  Turn on the sample pump and set the TEST function to RCEL, which measures the reaction 

cell pressure. Turn off the shutoff valve and monitor the cell pressure. The pressure should 
not increase more than 1 PSI in 5 minutes. 

If you have a leak checker: 

1.  Turn off instrument power and pump power. 

2.  Disconnect pump at rear panel. Cap the sample inlet port, ozone generator air inlet, and zero 

air inlet (if Z/S valve option present) and connect leak checker to exhaust port. 

 

3.  Pressurize system and check for leaks by watching overall pressure. The pressure should not 

drop more than 1 “-Hg in 5 minutes (0.5 PSIG in 5 min). 

If instrument fails pressure test, each fitting needs to be leak checked with soap solution to find 
the location. Be careful that the system is always pressurized so as not to draw soap solution into 
the plumbing system. Make sure you dry off any accumulated soap solution. Refer to Figure 8-4, 
Figure 8-5 for pneumatic diagrams. 

1.  Scroll the TEST functions to PMT.  

2.  Input zero gas. 

3.  Shine a powerful flashlight or portable incandescent light at the inlet and outlet fitting, and at 

all the joints of the reaction cell. The PMT value should not respond to the light.  

If there is a response, tighten the joints or replace the tubing with new black PTFE tubing. We 
often find light leaks are caused by o-rings being left out of the sensor assembly.