MDLT-ONE

Micro Dilution Tunnel

The MDLT-ONE is a compact partial-flow dilution tunnel designed for accurate particulate matter (PM) sampling from engine or vehicle exhaust. Using HEPA-filtered air and precise venturi flow meters, it dilutes exhaust streams and collects PM on filters, ensuring reliable measurement with a small footprint.

MDLT-ONE

Micro Dilution Tunnel

Why Choose MDLT-ONE

Compact & Integrated – Multi-function controllers and heated filter system in a single rack.
Filter Weighting Efficiency – Single filter covers multiple phases, minimizing handling.
Automated Calibration – Dual venturi meters ensure consistent, real-time accuracy.
ONE Platform Integration – Compatible with HORIBA ONE for seamless scalability.

Key Advantages of MDLT-ONE

Compact System Design

Single Rack Unit

Combines controllers and filters into a streamlined, space-saving setup.

Efficient PM Sampling

One Filter, All Phases

Captures particulate matter across test phases without filter replacement.

Smart Calibration

Dual Venturi Flow

Automates zeroing and adjustments for reliable test accuracy.

Seamless Integration

ONE Platform Ready

Easily integrates into modular emission testing systems for future growth.

Technical Specifications of MDLT-ONE

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 80 L/min^*1 (under the condition of 20 °C and 101.3 kPa)
Accuracy of dilution ratio		Within ± 5 % (Confirmed by measuring CO₂) 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.
Configurations
System configuration		・Main unit: Dilution-tunnel unit ・Operation unit: PC, monitor, keyboard and mouse (table is not included)
Utilities		・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
Dimensions		・Main unit: 570 (W) × 730 (D) × 1700 (H) mm ・Space for operation unit: 900 (W) × 500 (D) mm (table is not included)
Mass		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		・φ70 mm type: actual PM sampling area φ60 mm, with back-up filter ・φ47 mm 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
Options
Filter auto-changer^*3		Changer for automatic replacement of PM filter (φ 47 mm)
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