The Best PM-CEM On The Market

The P5: A Versatile PM-CEM


The P5 is a sensitive and reliable CEM for measuring particulates in a flowing gas in stacks and ducts. It provides the user with CONTINUOUS, IN-SITU measurements of mass concentration and is very useful for the following applications


 process optimization e.g. checking and diagnosing boiler firing to maximize fuel utilization and minimize particulate emissions

 compliance monitoring to meet an emission permit e.g. to provide a continuous readout in the control room to enable the operators to keep the process in compliance at all times.

 air pollution control: the P5 provides a 4 - 20 MA output to an APC device for automatic emission control e.g. the P5 output steers the precipitator's fields to maintain compliance.

Product Detail

 The P5 was developed by Environmental Systems Corporation in the late 1970's.

 Uses the principle of light back scattering and is a single ended unit i.e. there are no mirrors or alignment requirements

 Measures particulate mass concentration in mg/actual cubic meter.

 Using stack test data a linear coefficient can be developed that converts mass concentration in actual units to dry standard units as used in permits.

 Provides a linear response to particles in the size range 0.1 to 5 microns

 The P5 has been tested and verified to duplicate EPA Method 5 within the tolerances specified in ISO 10155 and EPA preliminary monitor spec PS-11

 Has a measurement range of 1 to 20,000 mg/actual cubic meter

 Available with standard probe lengths of 18", 36" and 60". Custom lengths are also available.

 It is a rugged, modular design with easy access to all its working parts

 The sensor probe is air cooled using a built-in blower with 2 stage filter

 Installs on the side of the stack or duct by means of a 4" ANSI 150# flange

 Requires minimal maintenance: only periodic replacement of the air filter

 Large installed user base, many with multiple units

 2 models available:

 P5A has analog electronics and manual calibration

 P5B has digital electronics with automatic features such as calibration and fail-safe, etc

 The P5A gives the same accuracy as the P5B but is a less expensive version

An overview of the P5