DM-200® CEM DILUTION MODULE

Continuous Emissions Monitoring System

The ASI DM-200® CEM Dilution Module has been developed to meet the requirements of some of our more specialised applications, where our standard in-situ dilution probe or a rather complex and expensive ex-situ (extractive) dilution system is simply not practical. Whether your primary diluting device is to be used as a stand-alone unit for laboratory applications, integrated within a heated filter system design for CEM Systems (thereby producing a basic ex-situ diluting sampler), or integrated into your ambient level gas analyzer for process monitoring… the DM-200® CEM Dilution Module is a great solution. Originally designed as a second stage diluting unit, downstream of an in-situ or ex situ dilution probe, the DM-200® CEM Dilution Module can also produce extremely high dilution ratios should your application call for it.

Brochure

Exclusive features

DM-200® CEM Dilution Module

Extremely low sample flow rates	Reduces the maintenance and prolongs analyser life when dealing with harsh samples
Compact and lightweight design	Permits use of ambient level (low range) analysers to measure highly concentrated streams
Reduces the moisture content in the sample stream	Normal dilution ratios from 12:1 up to 350:1. Ratios to 122,500:1 can be achieved when modules are in series (or module used as secondary diluter to an in-situ or ex-situ dilution probe)

Exsitu Diluting Sampler

DM-200® CEM Dilution Module

Complete CEM Sampling Solution
Can be used in hazardous areas; no steam or electrical service required (non-heated version)

Cost effective sampling solution for complex applications (multipoint CEMS, redundancy, long length of sample line…)

Standard dilution based CEM system (unheated) comply with ATEX standards

The low volume of sample extracted for the analysis prevent contamination of the sampling line and minimise dust buildup on filters
High Sampling Performances
True Dilution based CEMS/Process analyser (no dryer or scrubber)

No risk of absorption/desorption typical of high SO2/SO3 application

Extremely low LoD can be reached thanks to ASI patented dilution technology and the last generation of ambient air analysers
Designed for sampling medium to high pollution load
Glass or Monel critical orifice

Fast loop preserve the response time

Special coatings by SilcoTek® (such as SilcoNert®, Dursan®, and Silcolly®) are also available

Wetted parts from stainless 316/316L. Complete with all fittings, mounting brackets and one critical orifice (available in Glass, Monel-400, or Stainless-316)
Modular and adaptive design
STACKED or FLAT mount module for more integration possibilities

Can be retrofitted to any existing dilution based CEMS

Special mounting provisions will allow for installation in your heated enclosure to ensure temperature stability as needed and can be heated to well over 350F (177C)

Compatible with any existing probe extension pipe assembly

Compatible with new or old model probe heaters

Installation flexibility; mounting brackets supplied as standard to allow for installation of the diluter within your pneumatic controller enclosure or analyser

DM-200® Dilution Ratio

Number of sample flow rates are possible which will allow the use of our diluting sampler with a wide range of ambient level analysers.

Dilution Rate	Sampling Flow
215:1 to 350:1	20 ml/min
95:1 to 150:1	50 ml/min
44:1 to 75:1	100 ml/min
32:1 to 50:1	150 ml/min
27:1 to 37:1	200 ml/min
20:1 to 30:1	250 ml/min
12:1 to 16:1	500 ml/min

Response time < 20 seconds

Regular Zero /Span calibration as required

System Integration

Aquagas-ASI_DM-200-Cem-Dilution-Module_Flow_Diagram

DM-200® Critical Orifices

Many critical orifice types available (Standard Glass, Quartz, Monel-400, or Stainless-316)

The DM-200® CEM Dilution Module is designed for exsitu gas sampling and environmental monitoring applications, mostly associated with process emissions. These instruments are most commonly used in Smoke Stack CEMS (Continuous Emissions Monitoring Systems), RATA or similar Test Audit Compliance, Process Monitoring, and specialised Laboratory Applications.

The critical orifice determines the constant flow rate at which the precise low flow sample is extracted from the source, as well as the ratio of dilution when configured with a fixed volume of dilution air (in dilution probe or dilution module applications). It may be made from either standard glass (borosilicate), or quartz, and also special metal types (Monel® or Stainless- 316), depending on the sample gas temperatures or properties. The standard glass orifice is used for temperatures up to 750°F (400°C); the special quartz or metal orifice is used for higher temperatures up to 1000°F (540°C).

Critical Orifices Lists

Tailored to TODAY’s CEMS requirements

DM-200® CEM Dilution Module

Typical Applications

Continuous Emissions Monitoring

In coal and gas fired power stations, cement kiln, foundry, paper mills… Stringent regulatory requirements for emission monitoring and reporting. The DM-200® CEM Dilution Module enables efficient and flawlessly compliance for a large range of contaminants. The DM-200® CEM Dilution Module can be installed upstream or downstream the Mercury absorber.

Gas Treatment Center

For DeSOx, DeNOx, Scrubbers, catalytic reactors and particulate filters, the DM-200® CEM Dilution Module provides real-time measurement to optimize removal efficiency resulting in significant savings of material and to less maintenance for plant operators.

Large combustion Plants

Large Combustion plants such coal fired power station require a data acquisition and handling system to collect and report the data. SO₂ emissions must be measured in pounds per hour using both an SO₂ pollutant concentration monitor and a volumetric flow monitor. For NO_x, both a NO_x pollutant concentration monitor and a diluent gas monitor are required to determine the emissions rate. NO_x measuring is not a current requirement, however if monitored, a CO₂ or oxygen monitor plus a flow monitor should be used. In monitoring these emissions, the system must be in continuous operation and must be able to sample, analyse, and record data at least every 15 minutes and then averaged hourly.

Governments mandate the installation of continuous emission monitoring systems (CEMS) at state-controlled key polluting facilities in order to provide direct, real-time, continuous measurements of sulfur dioxide (SO2) emissions. Most coal-fired power plants in the world have installed and are operating SO2 and NOx CEMS. As environmental authorities strengthens the SO2 control program and implements rigourous nitrogen oxides (NOx) and carbon dioxide (CO2) control programs, the quality of and confidence in CEMS data will become more important.

More applications

DM-200® CEM DILUTION MODULE

Exclusive features

Exsitu Diluting Sampler

Complete CEM Sampling Solution

High Sampling Performances

Designed for sampling medium to high pollution load

Modular and adaptive design

DM-200® Dilution Ratio

System Integration

DM-200® Critical Orifices

Tailored to TODAY’s CEMS requirements

Typical Applications

Large combustion Plants

SERVICES & PRODUCTS ENQUIRIES

PRODUCTS

PARTNERS

APPLICATIONS