The SEMTECH Filter System is a portable gravimetric sampling system used
to measure the mass of exhaust particulates. It can be used either for in-use
applications or in test cells, while meeting requirements of US EPA 1065.
The system consists of a cyclonic separator to remove coarse particles,
three traditional 47 mm filter holders, a mass flow controller to adjust
filter face velocity, a high capacity vacuum pump, pneumatic ball valves
to engage filters, downstream isolation solenoids, and an optional heated
sample line. All wetted surfaces are stainless-steel, heated to 47°C. The
system can be operated from the built-in interface panel, or optionally
through the SEMTECH-DS host software where sampling can be automated
based on NTE signals, engine RPM, exhaust flow rate, or other user-defined
Optional SEMTECH-DS Integration
When integrated with the SEMTECH-DS, Sensors’
gaseous emissions analyzer, user-defined automated
sampling configurations are available:
Automated Sampling: Sampling can be activated on
a given filter automatically when a certain criteria is
met. For example, all filters can be set to sample only
during NTE events, and toggle to bypass when non-NTE
Automated Filter Limits: The system will automatically
disable filters when either desired sample duration
or filter loading has been achieved. Filter loading is
determined based on the pressure drop across the
Remote Use: With the PC based software, the current
temperature and flow conditions can be set and
monitored remotely from the unit.
System Features and Benefits
1065 Compliant: The SEMTECH Filter System is
designed to meet the sampling requirements and
recommendations of CFR40 part 1065 for both in-use
and test cell applications.
Cyclonic Separator: The exhaust sample first passes
through a heated cyclonic separator to remove coarse
elements prior to passing through the filter elements.
Three Filter Paths: The system contains three, 47mm
diameter filter holders. The system can be set to
automatically switch between these filters and the
bypass line, in accordance with pre-set test conditions.
Pneumatic ball valves and downstream isolation
solenoids are used to select the desired flow path.
Low Maintenance: The unit was designed with an easy
access door to remove the filter holders and replace the
filter elements. Other access panels enable easy removal
of the cyclone and fuse panel.
Easy Operation: The built-in display panel shows all of
the information needed to manually operate the unit.
Temperature settings, flow settings and status indicators
are all clearly defined and user configurable.
Filter System Section View
User Interface with DS Integration Software
Power Supply: A 12VDC supply with either 120VAC or 220VAC
input is available, either as a rack mount or a portable unit.
Communications Cable: Serial cable to allow remote control of
the unit from a laptop, or through the SEMTECH-DS.
Heated Line: A custom designed, self regulating, heated sample
line carries the sample either directly from the exhaust, or from
a dilution system, to the cyclone inlet. The 1/2” stainless steel
line is powered from the Filter System.
Rear Panel Connections
The SEMTECH Filter System is a traditional, EPA 1065 compliant,
gravimetric sample system designed to collect exhaust
particulates from a diluted sample on pre-weighed filters. Post-
sample filter weights, filter flow rates, and measured dilution
ratio (from SEMTECH MPS or other dilution system) determine
the tailpipe PM rate. A vacuum pump pulls the diluted exhaust
sample (at ambient pressure) through the cyclonic separator,
where coarse particulates are removed from the sample. HEPA
filtered make-up air is added in order to maintain desired filter
face velocity without pulling excess vacuum on the diluted
sample. The sample is then pulled into a distribution manifold,
where the sample is then fed into one of the three filter holders
or the bypass. Pneumatic ball valves and downstream isolation
solenoids determine the sample path, which can be controlled
manually or automatically based on preset sampling criteria.
with a wide range of customer support. Sensors’
Remote Support, powered by WebEx, enables our
trained technicians to view your SEMTECH unit in
real-time, to help answer your questions, diagnose
issues, and evaluate data, without requiring any
additional software. The SEMTECH Users’ Network,
SUN, has a forum for users to share insights on best
practices for in-use emissions testing, and to stay up
to date with the latest software releases.
Filter Holders are Easily Removed for
Front Panel Display
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
While due caution has been exercised in the production of
this document, possible errors and omissions can occur.
Ambient Conditions: 0°C to 45°C, non-condensing
Standard 0perating temperature: 47°C ±5°C
Storage temperature: -40°C to 60°C
Sample flow rate (internal pump):
Quartz or glass fibers: 10 - 40 SLPM
Teflo fibers: 10 - 30 SLPM
Warm up time: 40 minutes at 20°C ambient
Power Requirement: 12VDC nominal
30A during warm-up, 15A at steady state
Weight: 48 kg
Communications: RS322 and CAN
Material: Teflon coated aluminum
Dimensions: 16” x 13 7/8” x 3 1/2”
Inlet: 1 1/2” OD
Weight: 2.7 kg
Element diameter: 47mm
Holder material: 304 stainless steel
Height: 108 mm
Max outer diameter: 73 mm
Inlet and outlet diameter: 1/2” FNPT
Weight: 1 kg