Monitors particulate matter and water soluble gases from stack/ stationary source with 2 specially designed thermocouples for range 0-500 degrees C and 0-1000 degrees C

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  • Cumbersome Manometer has been replaced with digital pressure cell
  • Designed to determine the velocity of gases also.
  • Measures total quantity/volume of the emissions very accurately.
  • Size and weight of panel has been reduced considerably.
  • Pitot and probe pipe is being provided with extendable arm of 1m each.
  • Calibrated Pitot, probe pipe, thimble holder, nozzles, tools etc, all accommodated in a carrying case.
  • Temperature and pressure at inlet of the rotameter, in order to normalize volume of the sampled gas.
  • Number of joints have been reduced & thus chances of leakages are minimized
  • Tripod stand for better accessibility.
  • Compact Hardware & Portable light weight rotatory vane type pump etc.
  • Standard accessories like rotameter, pressure & temperature, metering system & provision for simultaneous sampling.
  • Sampling train with improved glass joints & ice tray for better cooling.
  • Specially designed 2 thermocouples in the range 0-500C and 0-1000C
  • Leveling assembly ensures that the Rotameter is standing in right angle vertically.
  • Dry Gas Meter added in panel itself to measure total sample volume.
  • Ambient Temperature Sensor with Digital Display.
  • Special Push-Fit Joints to minimize the assembly time.
  • Easy Leak Check facility to ensure accurate monitoring.
  • Programmable timer for sampling vacuum pump
  • Provided with NABL Calibration Certificate


The most common and widely used method (world over) is extractive sample method or Grab sampling technique. Grab sampling technique is also often treated as the reference standard method. Grab Sampling technique is not restricted to a specific pollutant. The same system with different reagents may be used for a variety of pollutants and over different ranges of concentration. Stack Sampler VSS1PLS is one such Grab Sampler which can monitor Particulate Matter (PM) and any water-soluble gaseous pollutants l ike SO, NO., HF, Cl, , H, S, NH, etc., in industrial emissions from Stationary source I Chimney and Vent.

Utilizing the experience of last 30 years, CPCB in 2015 revised the specifications of the Stack Sampling System & Envirotech has produced a new model VSS1PLS with improved features strictly in compliance with latest CPCB guidelines so as to obtain reliable results. VSS1PLS overcomes all the drawbacks of previous models.
The operating principle is simple. The Particulate Matter is collected over a filtration thimble. It entraps
and absorbs various gaseous pollutants in suitable reagents, which are analyzed subsequently by simple Wet Chemistry methods to determine the concentration of specific pollutants.