SEMTECH®-PPMDPortable Parti culate Measurement Device

The Portable Parti culate Measurement Device, the SEMTECH-PPMD, is the only portable system that directly measures the mass of exhaust parti culates under real world conditi ons, with nanogram sensiti vity. The unit integrates three key, patented subsystems from the SEMTECH product line, into a single self contained unit: the Exhaust Flow Meter (EFM), the Micro Proporti onal Sample System (MPS), and the Carousel Quartz Crystal Micro balance (CQCM). When used in conjuncti on with the SEMTECH-DS, Sensors’ gaseous emissions analyzer, it can be used to measure Not-to-Exceed events, enabling complete measurement compliance with the EPA’s testi ng requirements.

The PPMD comes with a host soft ware applicati on that allows the user to control the unit for system setup and audits, view the current system status, and collect, process and analyze the data. Results are displayed in easy-to-read tabular and graphical formats.

Emissions Measurement

Solutions

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SEMTECH-PPMDPortable Particulate Measurement Device

Optional Accessories

Micro Constant Dilution System: For engines with high particulate emissions, a secondary constant dilution unit is built into the system, in addition to the proportional dilution system.

Humidifier Module: This external module provides humidified air for the bypass flow over the crystals, to condition them before and after sampling.

Horizontal Mounting Kit: This kit enables sideways mounting of the PPMD.

Dual Power Cable: Power cable specifically designed to provide power to both the SEMTECH-DS and the PPMD simultaneously.

System Features and Benefits

Proportional Sampling: The built-in partial flow dilution system eliminates the need for a CVS, while meeting EPA’s CFR40, part 1065 and ISO 16183 accuracy requirements.

Multi-Crystal Design: By using eight crystals for mass measurements, one crystal can always be used as a reference crystal, which measures the particulate mass in the ambient air and accounts for this in the mass calculations. Additionally, crystals are allowed to stabilize between samples, enabling eight hours of data collection between crystal cleanings.

Highly Sensitive: With a crystal mass sensitivity of 100 Hz/µg, short sample times can be used for testing.

Fast Results: With the PPMD post processor, results can be obtained within five minutes of data collection, in lieu of the typical 24 hour turn-around time for batch processing from a gravimetric filter system.

Low Maintenance: Crystal cleaning and filter changes are the only regular maintenance items, which are simplified with easy access.

SEMTECH-DS Integration: The system is designed to be operated as a stand-alone device, or in conjunction with Sensors’ gaseous emissions analyzer, for a complete emissions measurement solution, that meets the EPA’s CFR40, part 1065 portable emissions measurement requirements.

Sample Installation

PPMD Section View

CQCM

Secondary ConstantDilutionOption

Proportional Dilution

Exhaust Flow Inlet

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SEMTECH-PPMDPortable Parti culate Measurement Device

Micro Proporti onal Sample System (MPS): The SEMTECH-MPS is a parti al fl ow diluti on system that controls the diluti on air fl ow with a multi -bit parallel solenoid array. Each solenoid is fi tt ed with a criti cal fl ow orifi ce to provide precise and repeatable fl ow characteristi cs. The system uses a signal from the EFM to establish a diluted fl ow that is proporti onal to the total raw exhaust fl ow. This patented technology operates at 10 Hz, providing a near instantaneous adjustment of sample fl ow. The MPS meets the requirements of US EPA CFR40 1065 and ISO 16183.

Carousel Quartz Crystal Micro balance (CQCM): The SEMTECH-CQCM brings the accuracy and sensiti vity of laboratory mass measurements to the fi eld. The system is comprised of eight crystals which oscillate at about 10 kHz. As the diluted sample from the MPS is pumped past the crystals, a corona discharge generates an electrostati c force, driving the parti culates to collect on the crystal surface. As the parti culates accumulate, the natural frequency of the crystal drops in relati on to the mass. When one crystal is done sampling, the system automati cally changes to the next available crystal, allowing each one ti me to stabilize before sampling again. In this manner, the system can operate unatt ended for up to eight hours.

The Technology

Exhaust Flow Meter (EFM): The SEMTECH-EFM is designed to measure total raw exhaust fl ow. It uses an averaging pitot tube that operates under the Bernoulli principle. The EFM provides a turn-down rati o of more than 50:1 and exceeds the US and European performance standards for exhaust fl ow meters.

Micro Proporti onal Sample System

Carousel Quartz Crystal Micro balance

Exhaust Flow Tube

Sensors, Inc. • 6812 State Rd. • Saline, Michigan 48176 • PH:(734) 429-2100 • FX:(734) 429-4080 • www.sensors-inc.comSensors Europe GmbH • Feldheider Str. 60 • 40699 Erkrath • Germany • PH: +49 (0) 2104-14188-0 • FX: +49 (0) 2104-14188-14

NOTE: Specifications are subject to change without no-tice. While due caution has been exercised in the produc-tion of this document, possible errors and omissions can occur.

R 05/09

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SEMTECH-PPMDPortable Particulate Measurement Device

PPMD Specifications:Warm up time: 60 minutes at 20°CSample flow rate: 1.0 l/minuteData Acquisition: 1 HzSensitivity: 0.002 µgData Storage: up to 48 hrs. at 1Hz data acquisitionPower Requirement: 12VDC nominal 20A during warm-up (240W), 10A at steady state (120W)Operating temperature range: 0 to 40°C ambientStorage Temperature: 0 to 60°C dryWeight: 77KgData transmission: 1 RS232 serial port for connection to SEMTECH-DS 1 RS232 serial port for connection to the host computer system Internal CAN network

EFM Specifications:Flow measurement linearity: <1.0% full scaleFlow measurement accuracy: ± 2.5% of reading or ± 1.5% full scale, whichever is greaterData rate: 4 Hz

MPS Specifications:Sample Flow: < 5 l/minuteOutlet Flow: selectable up to 14 l/minuteDilution Ratio: configurable ranges 4:1 to 60:1Operating Speed: 10 Hz

CQCM Specifications:Crystal Oscillating Frequency: 10 kHzProcessor Speed: 40 MHzMass Sensitivity: 100 Hz/µgCorona: 8.0 kV @ 30 µA

255 mm255 mm

285 mm

560 mm