Servomex SERVOPRO - Introduction

SERVOPRO NOx Analyzers Page
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INTRODUCTION
Description
The SERVOPRO NOx is a versatile analyzer which uses the time-proven
Chemiluminescence Detection (CLD) method to measure NO or NO/NO2/NOx
concentrations, all in one standard package, which can also be configured with a
paramagnetic oxygen (O
2
) sensor for emissions monitoring and control. Servomex also
has a heated CLD analyzer for certification testing by heavy duty engine manufacturers
that must meet the stringent requirements of US EPA 40 CFR Part 1065. Both the
standard and heated analyzers can be configured with internal zero/sample/span valves
and an internal sampling pump.
The heated version of the SERVOPRO NOx is not configurable with the optional O2
sensor, this is only available in the standard version. It does however include a unique
internal oven that maintains all wetted sampling components before the detector at an
elevated, customer-specified temperature set to 100°C when running emissions from a
compressed natural gas (CNG) engine or at 85°C when monitoring all other gaseous fuels
emissions. The heated version was created for those applications that require the
quenching due to CO
2
and H
2
O to be below 2% of reading and in those specific cases
there is a rear mounted chiller accessory that is available along with an optional
WET/DRY conversion reporting feature.
Unlike conventional CLD analyzers which use a photo multiplier tube (PMT) detector,
the SERVOPRO NOx runs at atmospheric pressures allowing the use of a high sensitivity
photodiode detector which does not require a vacuum pump for operation. While the
PMT detector will go to much lower detection limits when used for ambient air
applications, the benefits of the photodiode detector in emissions monitoring are many