Excessive Noise; Slow Response; Auto Zero Warnings - Teledyne T200 User Manual

EXCESSIVE NOISE

Excessive noise levels under normal operation usually indicate leaks in the sample supply
or the analyzer itself.
Ensure that the sample or span gas supply is leak-free and carry out a detailed leak
•
check as described earlier in this chapter.
Another possibility of excessive signal noise may be the preamplifier board, the high
voltage power supply and/or the PMT detector itself.
• Contact the factory on troubleshooting these components.

SLOW RESPONSE

If the analyzer starts responding too slow to any changes in sample, zero or span gas, check
for the following:
• Dirty or plugged sample filter or sample lines.
Sample inlet line is too long.
•
Leaking NO/NO
•
Dirty or plugged critical flow orifices. Check flows, pressures and, if necessary,
•
change orifices (Section 5.6.9).
Wrong materials in contact with sample - use glass, stainless steel or Teflon materials
•
only. Porous materials, in particular, will cause memory effects and slow changes in
response.
Dirty reaction cell. Clean the reaction cell.
•
Insufficient time allowed for purging of lines upstream of the analyzer. Wait until
•
stability is low.
Insufficient time allowed for NO or NO
•
until stability is low.
• Moly temperature is too low. Check for proper temperature.

AUTO ZERO WARNINGS

Auto Zero warnings occur if the signal measured during an Auto Zero cycle is higher than
200 mV.
Note
If this value is higher than 150 mV, check that the Auto Zero valve is operating
•
properly.
To do so, use the Utilities>Diagnostics>Digital Outputs menu to toggle the valve
•
on and off.
Listen if the valve is switching, see if the respective LED on the relay board is
•
indicating functionality.
Alternatively, navigate to the Dashboard and observe the PMT value change between
•
the two valve states.
150 Teledyne API T200 NO/NO
valve. Carry out a leak check.
X
calibration gas source to become stable. Wait
2
The Auto-Zero warning displays the value of the Auto Zero
reading when the warning occurs.
/NO Analyzer with NumaView™ Software
2 x
083730200A DCN7962