Ideally designed for stack emission monitoring based on the US EPA methodologies, PEM-SMS-4 Stack Monitoring System is a highly advanced automatic sampler, which facilitates the sampling of particulate matter maintaining iso-kinetic conditions, moisture and gaseous pollutants in stacks and ducts. It is programmable to select the required mode of sampling for particulate, moisture or gaseous sampling. Moisture Content can be evaluated by setting mode of sampling to moisture and sampling for preferably up to half an hour. Gaseous mode allows the samples to be collected in specific adsorbing chemicals for further analysis. The system provides for a constant flow mode for particulates for use in cyclones.

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When sampling for particulates the system, software provides a guided operation by ensuring the required parameters are initially entered by the user using the keyboard and display. This includes parameters like gas composition, moisture content (evaluated by SMS4 or manually entered), stack dimensions, barometric pressure and pitot tube coefficient.

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The system then recommends the ideal nozzle size, number of traverse points and their distances. Solid state pressure sensors and temperature sensors used in the system measure the various pressure and temperature conditions in stack. It computes the iso-kinetic set point, which is displayed and utilized for continuous control of the sampling flow rate through a proportional control valve.

During the sampling run, the system not only measures stack gas velocity but also continuously computes and regulates the sampling flow rate automatically to comply with iso-kinetic sampling conditions through out the sampling. Stack gas velocity computation is carried out based on the of pitot tube dp, flue gas temperature and gas composition and barometric pressure. In the run mode the display continuously shows the linear velocity, computed iso kinetic flow rate, actual sampling flow rate, elapsed sampling time and volume collected so there is a clear feedback as needed in a true system of how well the iso kinetic conditions are being maintained.

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The system is so versatile and user friendly that it eliminates the need for paper, pen or calculator on the field or off the field as all the data is stored in the memory. After entering the initial & final weight of the filter paper through the control module keys, the system computes and allows data transfer and reporting on the particulate matter concentration, volumetric discharge and emission rate of PM from the stack.

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Applications :

 

• Stack emission monitoring by industries like Chemical, Paint, Cement, Fertilizers, Sugar etc.

• Stack monitoring in Thermal Power Stations

• Compliance monitoring services

• Impact Analysis Evluations

• ISO 9001,14001,180001 Audit Compliance

• Environment Audit Reports

• Factory Act Compliance

• Environment Impact Assessments

• Engineering and Science Colleges, Universities

• Demos and Operation Trainings.

• Lab Applications

• Environmental Impact Studies

• Fuel efficiency and emission studies.

• Data Collection and Reporting

Physical Design Highlights :

The automatic stack monitoring system has been designed for easy portability and making the application and usage to be guided and user friendly keeping in mind the difficulties encountered for collecting stack emission samples.

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The stack interface consists of various sampling accessories like pitot tube, sampling probes, nozzles and so on.

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The electronic control module is a rechargeable battery operated portable and housed in a light weight aluminum easy to carry box. It has a 32 character large LCD module, a ten keys keypad and a micro-controller based control module with internal memory.

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The sampling pump interface module consists of a dry rotary mono-block pump with graphite vanes having a free flow greater than 95 LPM and a proportional control valve regulated by the control module for maintaining Iso-kinetic flow.

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The impinger module for gaseous sampling mode consists of a thermocole insulated, lightweight, fiber glass cabinet with capacity to accommodate 6 glass impingers. Low temperature is maintained by keeping ice in the module.

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An all metal, thermally insulated condenser unit with copper coil is provided for cooling of the sample gas and removal of moisture. A solid state temperature sensor measures gas outlet temperature for on line moisture correction.

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Standard accessories include a Pitob assembly of 1 meter length consisting of a “S” type Pitot tube ( marked and engraved), a sampling probe and a thermocouple temperature sensor all mounted together in two blocks along with a Pitob box. A set of interconnection hoses of PU tubes, 3 numbers of 12 mm for sampling and 2 nos. of 6 mm for Pitot connections are also provided along with a, a thimble holder, a set of 3 nozzles and a set of tools.

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Salient Features :

 

• True Iso-Kinetic Sampling

• Automatic Computation Of Online Linear Velocity & Iso-Kinetic Flow Rate

• Computation of Number of Traverse Points and Their Distances

• On-Line Condenser Temperature Measurement & Moisture Correction

• Automatic Recording of Data

• Compact, Lightweight, Portable & Battery Operated

• Standard accessories provided as per method 17 with system add-ons available for other methods

• Automatic Control of Flow to Iso-Kinetic Conditions

• Ideal Nozzle Size Computation