NGA 2000 CLD
Instruction Manual
June 2007
d.Replacement of Converter
If the subnormal conversion efficiency is real, and not due to measurement error introduced by the test setup, the converter must be replaced. See section
The usual case of converter failure is destruction of a large part of the catalytic material be excessive heat. This is due either to an excessively high temperature setpoint or failure of the converter temperature control circuitry.
e.Capillaries
Replacement vent and pump capillaries should be installed
Use of a wrench can constrict capillariesm, thus changing flow rate. Sample capillary is metal; use a wrench for tightening.
f.TEA Scrubber
The presence on NO2 in the NO cylinders can cause inaccurate converter efficiency values. The TEA Scrubber accessory can be used to remove residual NO2 from the NO cylinders. Use of this accessory allows a NO2- free NO calibration gas.
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