MDLT-1300T

Applications

• Measurement of particulates from any sized engine - heavy duty to small utility.
• Transient and steady-state test procedures.
• Measurement of engine-out particulate emissions for R&D of exhaust treatment devices.

 Typical Uses 

• ETC (European Transient Cycle) 
• ESC (European Stationary Cycle)
• ECE-R49
• EEC 91/542
• ISO 8178
• ISO-8877
• ISO-16183

Features

• Uses high-accuracy venturi flow meters to measure total diluted-exhaust and dilution-air flow rates.
• Uses a piezo valve and parallel CFO to provide fast, precise control of dilution-air flow rate for accurate, proportional sampling during transient tests. The CFO delivers the minimum air flow required during a test; the piezo valve quickly adds additional dilution air to achieve the specific rate required for proportionality.
• Replaces full-flow dilution tunnels.
• Compact size is perfect for small test cells.
• Transports easily from one test cell to another.
• Operates as a stand-alone system or in conjunction with a conventional CVS.
• Requires less frequent calibration checks than systems based on mass flow controllers (approx. every 2 days vs. every 2 hours).
• Auto-calibration adjustment sequence maintains proportional sampling precision with minimal operator action.

Options

• Automatic filter changer (AFIC-1400) - provides 14 sets of filters in one cartridge assembly.
• Heated Sample Transfer Line - operable from 150°C to 450°C.
• Dilution-Air compressor - supplies clean, dry dilution air.
• Dilution-Air Cooler Module - high-temperature heated-line use may require cooled dilution air to maintain 52°C at the filter.
• Heated Particulate Filter Unit (HF-47) -- temperature-controlled, heated particulate filter enclosure with particle pre-classifier.

Principle

Takes a small portion of total exhaust flow, dilutes it with air to create constant flow rate, and passes the sample through filters to measure particulate matter.

Proportional Sampling

1. Analog input to MDLT-1300T indicates total exhaust mass flow rate. MDLT-1300T keeps the partial exhaust mass flow rate proportional to the total by varying the dilution air mass flow rate:

GPEXH = GTOT - GDIL

Where:

GPEXH = Mass flow rate of partial exhaust sample entering tunnel

GTOT = Mass flow rate of diluted exhaust (constant)

G_DIL = Mass flow rate of dilution air (varies)

2. Since transient test conditions cause frequent changes in total exhaust mass flow rate, fast-acting control of dilution air flow is essential to maintain proportionality. MDLT-1300T meets this requirement with a CFO and piezo valve:

• The CFO delivers minimum air flow required during a test.
• The piezo valve quickly adjusts flow to specific rate required for proportionality.

Constant Sampling

Partial exhaust sample, dilution air, and diluted exhaust flow rates are constant. This mode allows the MDLT-1300T to be used with a conventional full-flow CVS for transient testing or as a standalone unit for steady-state tests. The system can simulate both double dilution and single dilution operation when used with a CVS.

For constant sampling, the user may specify either a fixed dilution ratio or fixed flow rate.

Flow diagram