INTRODUCTION:
MOST EFFECTIVE & ADVANCED TECHNIQUE FOR STACK / DUCT / CHIMNEY / E.S.P. / BAG-HOUSE EMISSION MONITORING.

Stack Monitoring for Suspended Particulate Matter (S.P.M.) is greatly simplified and improved by the use of “CONTINUOUS EMISSION MONITORING SYSTEMS (CEMS) / STACK MONITORS”. The Sensor of the CEMS / Stack Monitor is mounted on the stack / duct and the existing S.P.M. level is determined using Thimble / Iso-Kinetic Process. The CEMS / Stack Monitor is then calibrated to continuously display the S.P.M. or Emission level in terms of mg/nm3 in an on-line manner. A 4 to 20 mA DC Analog Output is also provided for recording or control purposes & integration with the Central Control Room.

The Continuous Emission Monitoring Systems (CEMS) / Stack Monitors are indigenously manufactured and based on the internationally accepted & widely approved “TRIBOFLOW” principle. These instruments give a CONTINUOUS display in mg/nm3 of the emissions / suspended particulate matter in the stacks / ducts / chimneys which are being monitored. The instrument readings will closely match those you obtain by iso-kinetic / thimble process measurement.

What is “TRIBOFLOW” ?
The Triboflow principle is an impact principle where a Sensor is placed in the path of the emissions which are to be monitored. As the emission particles come in contact with the Sensor, a Triboflow signal is generated which is proportional to the emissions. This principle works only for Solid particles. Since this principle is not affected by Liquid or Gas particles, it is particularly suitable for emission or stack monitoring.

TRIBOFLOW PRINCIPLE has been internationally and universally approved by several Environment Agencies including USA (EPA i.e. Environment Protection Agency) and Germany.

The Basic Operation of the CEMS is as follows :
The CEMS is highly accurate and reliable. It consists of a Sensor with shielded cable and a remote Electronic Control Unit. The Sensor is a 316 stainless steel rod with Teflon Insulator. The Sensor is installed in the duct / stack where the emission particles are to be monitored / measured, as shown in Figure 1. As the particles flow in the duct / stack and strike the Sensor, a Tribo-electric current and a Tribo-electric voltage are generated. These signals are then conditioned, amplified & processed through sophisticated electronic circuitry and micro-processors and an Output Signal is generated which is directly proportional to the emissions flowing in the duct / stack.

FIGURE 1 - TYPICAL INSTALLATION OF CEMS

KEY FEATURES OF THE CEMS

	Accurate and Reliable Readings, directly in mg/nm3.
	Facility to display instantaneous emissions as well as average emissions.
	Time period for averaging emissions is user determined.
	4-20mA Output available for interface with Central Control Room Systems for Charting / Tabulating / Recording etc.
	User Determined Alarm Set Points to indicate high emissions.
	Minimal Maintenance Required.
	No Moving Parts or Consumables.
	Long Life of Instrument.
	Frequent calibration / setting / alignment is not required.
	Easy to use and operate.
	Sophisticated since it is micro-processor based.
	Not affected by Moisture.
	Low Cost and High Quality.