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    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

    An overview of the P5

    P5B Particulate Monitor Electro-Optics System

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

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

    • it measures particulate mass concentration in mg/actual cubic metre.

    • by 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.

    • it 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

    • it has a measurement range of 1 to 20,000 mg/actual cubic metre

    • it is 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

    • it requires minimal maintenance: only periodic replacement of the air filter

    • there is a 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