Semtech PPMD Portable Particulate Measuring Device
- 1. SEMTECH® -PPMD Portable Particulate Measurement Device The Portable Particulate Measurement Device, the SEMTECH-PPMD, is the only portable system that directly measures the mass of exhaust particulates under real world conditions, with nanogram sensitivity. 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 Proportional Sample System (MPS), and the Carousel Quartz Crystal Micro balance (CQCM). When used in conjunction 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 testing requirements. The PPMD comes with a host software application 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
- 2. 2 SEMTECH-PPMD Portable 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. HorizontalMounting Kit:This kitenables sidewaysmounting 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 withinfiveminutesofdatacollection,inlieuofthetypical24hourturn- 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 Constant Dilution Option Proportional Dilution Exhaust Flow Inlet
- 3. 3 SEMTECH-PPMD Portable Particulate Measurement Device Micro Proportional Sample System (MPS): The SEMTECH-MPS is a partial flow dilution system that controls the dilution air flow with a multi- bit parallel solenoid array. Each solenoid is fitted with a critical flow orifice to provide precise and repeatable flow characteristics. The system uses a signal from the EFM to establish a diluted flow that is proportional to the total raw exhaust flow. This patented technology operates at 10 Hz, providing a near instantaneous adjustment of sample flow. 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 sensitivity of laboratory mass measurements to the field. 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 electrostatic force, driving the particulates to collect on the crystal surface. As the particulates accumulate, the natural frequency of the crystal drops in relation to the mass. When one crystal is done sampling, the system automatically changes to the next available crystal, allowing each one time to stabilize before sampling again. In this manner, the system can operate unattended for up to eight hours. The Technology Exhaust Flow Meter (EFM): The SEMTECH-EFM is designed to measure total raw exhaust flow. It uses an averaging pitot tube that operates under the Bernoulli principle. The EFM provides a turn-down ratio of more than 50:1 and exceeds the US and European performance standards for exhaust flow meters. Micro Proportional Sample System Carousel Quartz Crystal Micro balance Exhaust Flow Tube
- 4. Sensors, Inc. • 6812 State Rd. • Saline, Michigan 48176 • PH:(734) 429-2100 • FX:(734) 429-4080 • www.sensors-inc.com Sensors 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 4 SEMTECH-PPMD Portable Particulate Measurement Device PPMD Specifications: Warm up time: 60 minutes at 20°C Sample flow rate: 1.0 l/minute Data Acquisition: 1 Hz Sensitivity: 0.002 µg Data Storage: up to 48 hrs. at 1Hz data acquisition Power Requirement: 12VDC nominal 20A during warm-up (240W), 10A at steady state (120W) Operating temperature range: 0 to 40°C ambient Storage Temperature: 0 to 60°C dry Weight: 77Kg Data 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 scale Flow measurement accuracy: ± 2.5% of reading or ± 1.5% full scale, whichever is greater Data rate: 4 Hz MPS Specifications: Sample Flow: < 5 l/minute Outlet Flow: selectable up to 14 l/minute Dilution Ratio: configurable ranges 4:1 to 60:1 Operating Speed: 10 Hz CQCM Specifications: Crystal Oscillating Frequency: 10 kHz Processor Speed: 40 MHz Mass Sensitivity: 100 Hz/µg Corona: 8.0 kV @ 30 µA 255 mm255 mm 285 mm 560 mm