MEXA-720 NOx

Overview

The light and efficient MEXA-720 NOx analyzer has been engineered with a zirconia-ceramic sensor. This single unit provides fast-response measurements of NOx concentrations from diesel or lean-burn engines and can simultaneously measure air/fuel ratio (A/F), excess air ratio (lambda), and O2.

The sensor can be directly inserted into the exhaust flow, eliminating the need for a sample-handling unit. This feature minimizes measurement time delays due to dead-volume sampling.

Portability allows MEXA-720 NOx to be mounted in a vehicle for on-road R&D tests. 

Features

  • No sampling unit required.
  • Zirconia sensor provides high-speed response (< 0.7 second).
  • Portable, compact, lightweight (1/3 the size and weight of its predecessor).
  • Easy operation and maintenance.
  • Direct insertion of sensor avoids measurement time delay.
  • Very short warm-up time - enabled by zirconia sensor.

Applications

  • Engine R&D
  • Catalyst R&D
  • Fast, easy checking of NOx and A/F or lambda
  • On-board measurement

Frow drawing

Manufactured by HORIBA

Specifications

Components

NOx

A/F

Lambda

O2

Ranges

0-3K ppm

9.5-200

0.65-13.7

0-50 vol%

Response Time

T63 within 0.7 s

Accuracy

0-1000 ppm: ±30 ppm with 3 point calibration
1001-2K ppm: ±3% of reading with 3 point calibration
2001-3K ppm: ±5% of reading with 4 point calibration

9.50 to stoichiometric A/F: ±0.35 A/F
At stoich. pt.:
±0.15 A/F
stoich. pt. to 20 A/F:
±0.40 A/F
20.01-30.0 A/F:
± 0.90 A/F
30.01-40.0 A/F:
±1.70 A/F
40.01-50.0 A/F:
±2.60 A/F
50.01-60.0 A/F:
±3.70 A/F
60.01-200.0 A/F: corresponding to ±0.5 vol% O2

 

0-25 vol%: ±0.5 vol%

Warm-up Time

Approximately three minutes after turned on.
(Approximately five minutes for stabilization of readings.)

Acceptable
Vibration

For sensor:
0-294 m/s2
0-30 G

Calibration Gas

NOx calibration: (Gases humidified by bubbling)
Zero gas: N2 + H2O
Middle gas: NO/N2 (1K ± 100 ppm) + H2O
Span gas: NO/N2 (2K ± 200 ppm) + H2O
High gas: NO/N2 (3K ± 300 ppm) + H2O

O2, A/F, lambda calibration: (Gases humidified by bubbling)
Zero gas (stoichiometric point): N2 + H2O
Span gas (lean condition): Atmospheric air, corresponding to approximately 20.6 vol% O2
Rich condition: [CO+ H2 + CO2 / N2] + H2O, corresponding to approximately 0.8λ

Sample Gas
Conditions

Stoichiometric to lean for diesel or lean-burn engines.
Measurement gas temperature: -7 to 800°C

Ambient
Conditions

For main unit: 5 to 45°C; (operating), -10 to 70°C (storage)
Less than 80% R.H.

Dimensions and Weight
(W x H x D)

excludes protrusions
130 x 75 x 200 mm
5.12 x 2.95 x 7.87 in
Approx. 1 kg / 2.2 lb

Power

12 to 30 V DC, approximately 50 W

Outputs

Analog: (for recorder) DC 0 - 5 V, 2 channels:
OUT1: NOx concentration
OUT2: A/F, lambda, or oxygen concentration (changeable)
Digital input/output: (RS-232C, D-sub 9-pin female connector)
Input for changing settings; output for readings and settings

Accessories

Unit includes: Cable for sensor (10 m)

Options

  • Calibration Unit
  • Attachment nut
  • Blanking Screw
  • RS-232C cable
  • Probe for direct-insertion-type sensor
  • AC power adapter - Input: 100 to 240 V AC (50/60 Hz); Output: 13 V DC
  • Incorporation into on-road measurement system for measuring real time NOx mass emission, fuel consumption, road load and engine output.



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