Solid Particle Counting System MEXA-2100SPCS

Overview

The HORIBA MEXA-2100SPCS measures the number of solid particles directly from engine exhaust gas according to the requirements of
the GRPE PMP (Particulate Measurement Program) using
the Condensation Particle Counting(CPC) method.
The system can be used for engine research / development, for exhaust particulate filter performance testing and can also be used for certification with a regulation compliant dilution system (Direct sampling or CVS) when the pre-diluter is detached.
The compact main unit combines high performance and flexible packaging to adapt to the various test configurations and environments.

1.The compact main unit

  • Easy to install and transport in a laboratory
  • Small footprint

2.High accuracy sampling system

 The dilution factor within the SPCS is directly monitored and controlled by measurement of the diluted exhaust flow (by means of a Flow Orifice) and of the HEPA filtered dilution air, using an accurate Mass Flow Controller. As a result, the set DF is not affected by changes in sample pressure in the CVS or sampling system. Consequently the SPCS calibration factor (PCRF) can be used for many applications without specific calibration/correction of the diluters.

 

MEXA-2100SPCS Optional Modules

The combination of the main unit and optional modules allows a wide range of applications and sampling configurations to be supplied.


Dilution Factor Checker
(DFC)
Dilution factor check
and flowrate calibration


Volatile-particle
Generation Unit (VGU)
Generating volatile C40
particles for removal efficiency
check of evaporation tube


Linearity Check Unit
(LCU)
Generating NaCL solid particles for the
diagnostic CPC linearity check and
VPR particle penetration efficiency check

Features

Fully integrated system for stand-alone operation manually or under host CPU control using the AK-LAN host interface.
Comprehensive data logging
Automatic or semi-automatic utility functions for:

  • Tracer gas based dilution factor checks (including tracer gas analyzer*1)
  • PCRF*2 checks
  •  Volatile particle removal efficiency check
  •  CPC and system linearity check
  •  CPC zero, span and system zero checks

Verifiable accuracy and proven reliability due to absence of rotating parts
Two-stage dilution by Wide Range Continuous Diluter (WRCD) developed by HORIBA Group → Patent number : 7201071 (US)

*1 The system does not contain the gas analyzer for dilution factor check.
*2 PCRF: Particle Concentration Reduction Factor

 


Manufactured by HORIBA

Specifications

Model

MEXA-2100SPCS

Conformed standard

UN/ECE Regulation No.83 (Rev.3, Amend.2) *1

Application

Measurement of solid particles in engine exhaust with and without after-treatment systems (diesel, gasoline)

Sampling variation

Sampling raw exhaust from tail pipe *1

Measuring components and range

Number concentration of solid particles;
0-10000 up to 0-50000 particles/cm3
(after internal dilution)

Measuring principle

Laser detection condensation particle counting (CPC)

Operating environment

Ambient temperature: 5 ℃ to 30 ℃
Ambient humidity: 80 % or less as relative humidity

Lower particle size limit

Counting efficiency of 23 nm particles: 50 % ± 12 % Counting efficiency of 41 nm particles: 90 % or more

Sample inlet pressure (upper limit)

+100 kPa or less
(at inlet of sample probe, as compared to atmospheric pressure)

Dilution factors in diluters

Diluter in DSU: 10
Primary diluter (PND1): 10 to 200
Secondary diluter (PND2): 15

Accuracy of dilution factor

Within ± 10 % of nominal dilution factor setting

Volatile particle removal efficiency

99 % or more, for C40
(30 nm or smaller, and 10000 particles/cm3 or less)

PCRF

0.95 < fr(30nm) / fr(100nm) <1.3  
0.95< fr(50nm) / fr(100nm) <1.2

Power supply voltage and frequency

200/220/230/240 V AC (±10 %, max. 250 V),
50/60 Hz (±1.0 Hz),
single phase (to be specified at ordering)

Power requirements

Main unit (with heated sampling tube) + DSU: Max. 2.5 kVA
Main unit (with heated sampling tube) + DSU + all optional units: Max. 3.4 kVA

Dimensions/ Mass

(excluding any projections)

Main unit: 434 (W) x 845 (D) x 600 (H) mm, Approx.120 kg
(without DSU, transfer tube, control unit and optional modules) 
DFC: 464 (W) x 550 (D) x 320 (H) mm, Approx. 38 kg
LCU: 350 (W) x 690 (D) x 670 (H) mm, Approx. 35 kg
VGU: 550 (W) x 300 (D) x 450 (H) mm, Approx. 20 kg

*1: The UN/ECE Regulation No.83 (Rev.3, Amend. 2) requires dilution sampling method by connecting  with tunnel-CVS.
  Direct sampling method does not conform to the UN/ECE Regulation No.83 (Rev.3, Amend. 2) .

Measurement Techniques

System Configuration

The MEXA-2100SPCS design is based on the requirement described in UN/ECE Regulation No.83, Rev.3, Amend.2.