EPM 300 Series In-Situ Dilution probes0 pages

Product Specifications

Wet basis, dilution extractive
probes for continuous
emissions monitoring

Thermo Scientific
EPM 300 Series
In-Situ Dilution Probes

Key Features
•

Sample pump is not required for
sample lines less than 300 feet

•

Diluted sample is transported at
positive pressure

•

Heated sample line is typically
not required

•

Dilution of sample promotes filter
longevity and reduces maintenance

•

Easy in-situ calibration of total
dilution system

The Thermo Scientific EPM 300 Series In-Situ
Dilution Probes are designed for wet basis
measurement using dilution extractive
technology. The critical functions performed by
the EPM 300 Series Probes will prepare the
sample from the stack so that it can be
accurately and precisely measured by the
analyzer.
Using an air-driven aspirator, the system
extracts the sample from the stack. The
sample then passes consecutively through a
coarse filter, a fine particulate filter, and a
glass or quartz critical orifice. Lastly, the
sample is diluted with air from the aspirator,
creating positive pressure in the sample line as
it prepares for transport to the analyzer.
This dilution process reduces the dew point of
the stack gas to below that of the ambient air.
The processed sample can then be transported
to the analyzer up to 300 feet via an unheated
sample line. (Heated sample lines may be

required for low temperature applications.) In
addition, a sample pump is not required for
sample lines less than 300 feet which helps to
reduce costs and increase up-time. The critical
orifice determines the flow rate with which the
sample is extracted from the stack. The EPM
300 Series Probes offer a selection of three
different orifice materials, including 7 glass, 5
quartz or 5 Monel orifices, all of which permit
easy exchange to accommodate different
dilution ratio requirements. The process of
sample dilution, as utilized by the EPM 300
Series, promotes the filter longevity and
reduces maintenance.
In-situ calibration is easy with the EPM 300
Series Probes. The calibration gas is supplied
via the umbilical cord to the stack mounted
probe. Then, calibration gas enters the probe
and is diluted at the same dilution ratio as the
sample from the stack. The calibration line is
also used to provide blow back air to the
coarse filter for cleaning pu