STACK MONITORING SYSTEM

Model PEM-SMS 4

Salient Features 

True iso-kinetic sampling

Automatic computation of linear velocity

Ideal nozzle size computation

Computation of Number of traverse points and their  distances.

On-line condenser temperature measurement and moisture correction

Automatic recording of data

Battery operated, compact, lightweight, portable

Application

Model PEM-SMS 4 Stack Monitoring System is an advanced iso-kinetic sampler which facilitates the measurement of Suspended Particulate Matter (SPM) and gaseous pollutants in stacks and ducts. It not only measures stack gas velocity but also continuously computes and regulates the sampling flow rate to comply with iso-kinetic sampling conditions at all times.

Principle of Operation

PEM-SMS 4 implements the various basic methodologies developed by US EPA for measurement of Stack Gas Velocity, Moisture Content and for iso-kinetic sampling of SPM. Stack gas velocity computation is carried out based on the of pitot tube dp, flue gas temperature and gas composition and moisture contents. While the pitot tube dp and flue gas temperature are retrieved from on-line measurement, gas composition and moisture contents are input manually through the key-board and display serving as man-machine interface. Also selected manually is the ideal nozzle size. The system computes the iso-kinetic set point, which is displayed and utilized for continuous control of the sampling flow rate through a proportional control valve.

Solid state sensors are used for measurement of Pitot Tube dp, orifice dp and inlet pressure. Temperature sensors measure stack gas temperature, condenser temperature and orifice gas temperature.

PEM-SMS 4 is programmable to select the required mode of sampling from particulate, moisture and gaseous modes. The system provides for constant flow mode for particulates for use in cyclones.