Vue d'ensemble

The MDLT-ONE is designed to sample particulate emissions using the partial flow dilution method. A small portion of the total exhaust is diluted with HEPA* filtered air to create a constant flow rate through particulate filters to collect Particulate Matter (PM). Compliant to the latest regulations, the new MDLT-ONE is very compact and offers faster response by the use of high precision venturi flow meters and a piezo actuated valve.

*HEPA: High Efficiency Particulate Air


Small package

Heated filter system and flow controllers installed in a single rack. Swivel connection of tunnel section to cabinet allows flexible installation. Auto filter changer* can also be mounted in the main rack for space efficiency.

Automatic calibration software enhances accuracy and ease of use

The MDLT-ONE series performs automatic calibration by flowing air in-series through the two venturi flow meters and correcting any difference to zero in the software. This can be included into an automated sequence within a test template.

Integrated Operating Platform

HORIBA ONE series systems employ a common use interface, “HORIBA ONE PLATFORM” offering future expandability and ease of integration into Test Automation Systems.


PM Emission Measurement of All Engines

R&D Support of Engine and After Treatment System

Complies with worldwide emissions regulations


EU: Euro VI (HDV)

US: 40 CFR Part 1065/1066

Japan: Post new long term

EU: Stage IV / V (NRMM)




Fabriqué par HORIBA


System outline

PM sampling method

Partial flow dilution method

Control modes for dilution

Proportional sampling mode (Const. split ratio)/ Fixed dilution ratio mode (Const. dilution ratio)/ Fixed flow rate mode (Manual control)

Control methods for dilution

  • Real-time control based on analog input of exhaust flow rate
  • Control based on learned pattern of exhaust rate

Required signal for gas sampling

Isolated analog signal (0 to 10 V)

Flow rate of diluted gas

25 to 80L/min※1(under the condition of 20 °C and 101.3 kPa)

Accuracy of dilution ratio

Within ± 5 % (excluding the system with AFIC)
When dilution ratio=15 rate at 20 °C and 101.3 kPa: 53 to 80 L/min

PM mass calculation※2

PM mass (in g/test or g/kWh) can be calculated and saved, based on integrated values of flow rated and dilution ratio.


System configuration

  • Main unit: Dilution-tunnel unit
  • Operation unit: PC, monitor, keyboard and mouse (table is not included)


Purified air: for dilution gas, 400 to 700 kPa, oil free, at least 100 L/min (at 20 °C and 101.3 kPa)

Power supply voltage and frequency

  • Main unit: 100/110/120/200/220/230/240 V AC, 50/60 Hz, single phase
  • Operation unit: 100/110/120/200/220/230/240 V AC, 50/60 Hz, single phase

Power requirements

Main unit: Max. 3.0 kVA / Operation unit: Max. 0.5 kVA


  • Main unit: 570 (W) × 730 (D) × 1700 (H) mm
  • Space for operation unit: 900 (W) × 500 (D) mm (table is not included)


Main unit: Approx. 300 kg (excluding operation unit)

Number of filter lines

Max. 6 lines (5 for sample, 1 for bypass)

Type of filter holder

  • φ70mm type: actual PM sampling area φ60 mm, with back-up filter
  • φ47mm type:actual PM sampling area φ38.8 mm※1, with back-up filter※1

Operating conditions

Sampling Pressure

Between atmospheric pressure and up to 40 kPa    Back pressure of exhaust line: Less than 1 kPa


Filter auto-changer※3

Changer for automatic replacement of PM filter (φ 47 mm), both single-filter method and multi-filter method are available.

Valve switching

Additional air valve before filter (Replacement of sampling filter on bypass mode)

HOST interface※3

LAN communication using a 10 Base T port
Conforms to IEEE802.3 (ISO880 2/3)

Conditioner for dilution air / Compressor


*1, For the filter face velocity in the regulations (less than 100 cm/s), the flow rate for the φ47 mm filter must be 65 standard L/min.
*2, Input the amount of PM collected on filter to calculate PM mass. It is necessary to input engine output (kW) to calculate the PM mass engine output (g/kWh).
*3, Please contact HORIBA, when you order.