The document discusses a Low NO/NO2 Non-Dispersive UltraViolet Analyzer that uses non-dispersive ultraviolet (NDUV) technology to measure levels of NO and NO2 in engine exhaust. It meets 2010 EPA standards and uses UV absorption spectroscopy, which is not sensitive to CO2 and H2O. The latest design offers improved features over previous models, including an LED light source, shock resistance, and temperature control.

1. Low NO/NO2
Non-Dispersive UltraViolet Analyzer
Sensors’LowNO/NO2,uses Non-DispersiveUltra-Violet (NDUV) technology
to measure the levels of NO and NO2
in the exhaust of both spark ignited
and compression ignited engines. The analyzer meets the updated 2010
US EPA standards, as well as measurement standards worldwide. Non-
dispersive ultraviolet analysis is an absorption spectroscopy technique used
for gas analysis. The ultraviolet wavelength is used for the measurement of
NOx because it is not cross sensitive to CO2
and H2
O, which do not absorb
well in the UV region. Sensors’ latest design NDUV is built from the latest
technologies, offering improved features and benefits over our previous
design.
Emissions
Measurement
Solutions

2. Sensors, Inc. • 6812 State Rd. • Saline, Michigan 48176 • PH:(734) 429-2100 • FX:(734) 429-4080 • www.sensors-inc.com
Sensors Europe GmbH • Feldheider Str. 60 • 40699 Erkrath • Germany • PH: +49 (0) 2104-14188-0 • FX: +49 (0) 2104-14188-14
NOTE: Specifications are subject to change without no-
tice. While due caution has been exercised in the produc-
tion of this document, possible errors and omissions can
occur.
R 06/10
Low NO/NO2
Non-Dispersive UltraViolet Analyzer
Features
LED Light Source: The LED can be operated at very high frequencies, enabling an excellent signal-to-
noise ratio.
Shock Resistance: The mechanical design has been optimized for resistance to shock and vibration,
ensuring accurate data in the most rugged of in-use environments.
24-bit A/D Converter: This converter prevents DACs from railing.
6 Temperature Controlled Zones: Temperature controlled zones for the detectors, the pressure
transducer, the LED and the EDL ensure accurate data throughout a wide range of ambient temperatures,
and minimize drift.
Backward Compatibility: The 2010 Low NO/NO2
is compatible with our previous NDUV.
2010 Low NO and NO2
Specifications
Gas NO NO
2
Range of measurement 0 to 3,000 ppm 0 to 500 ppm
Accuracy
± 5 ppm or
± 1% of reading
± 5 ppm or
± 1% of reading
Resolution 0.1 ppm 0.1 ppm
Linearity
Intercept ≤ 0.5% of range
0.990 ≤ Slope ≤ 1.010
SEE ≤ 1.0% of range
R2
≥ 0.998
Intercept ≤ 1.0% of range
0.985≤ Slope ≤ 1.015
SEE ≤ 1.0% of range
R2
≥ 0.998
Repeatability
± 5 ppm or ± 2% of read-
ing
± 5 ppm or ± 2% of read-
ing
Noise ± 2 ppm ± 2 ppm
Span Drift (over 8 hours)
± 2% of reading or
20 ppm, whichever is
greater
± 10 ppm
Zero Drift (over 2 hours) ± 10 ppm ± 10 ppm
Response time < 2 sec < 2 sec