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Continuous Emissions Monitoring Software (DAHS)
  • High speed acquisition & logging
  • Configurable alerts for warnings
  • Real-time graphs and charts
  • Multi-lingual
  • Unlimited sensor readings
  • Configurable Reporting
  • Live Data Feeds
  • Saveable screen layouts


  • Overview
  • Data Acquisition & Processing
  • User Interface
  • Alerting
  • Configurable reporting
  • Data access
  • Live Data Feeds
  • Distributed Access


  • Non-MCERTS for part A2 and part B processes
    CEMWindows is perfect for organisations that do not need to adhere to stringent certification schemes.
  • High speed acquisition & logging
    Proven to read and log data at 1 second intervals with no restriction on recording historical data (*)
  • Real-time graphs and charts
    High quality displays of real-time data featuring multi monitors, multi windowed and resizable graphs and charts
  • Unlimited sensor readings
    Any instrument with digital or analogue output signal can be integrated
  • Configurable Reporting
    Configure reports for local inspectors and the Environment Agency needs in the required formats
  • Live Data Feeds
    Select and export data for any time periods in real-time
  • Multi Lingual 
    In seconds, the system can be switched 'real-time' to a number of different languages

(*) – The only limitation is available disk space

Data Acquisition & Processing

CEMWindows is highly configurable and very complex calculations and data processing changes can be configured realtime. CEMWindows also allows user-defined calculations and processing on incoming data if and when required

  • The number of user defined calculations that can be specified by the end user is unlimited.

  • CEMWindows can process data from a large range of instruments with a digital or analogue output signal spanning multiple different industries.

  • With CEMWindows it is easy to set uncertainty values, computing normalized values, adjusted values, calibration periods, plant status, instrument status, system status and plant on/off delay periods for plant start-up and shut-down.

  • Emissions data can be input (and output) in any user-definable unit including ppm, mg/m3, mg/Nm3, Kg/hr, %, m/s and mass emissions in Kg/Hr.

The system can also report all required emissions data such as 48 hour means as required on some sites. An almost unlimited number of auxiliary inputs can also be logged and reported such as steam flow and fuel flow. These auxiliary inputs can be a valuable tool to aid in the maximisation of plant efficiencies and detecting problems such as boiler tube leaks.

User Interface

Real-time data and system information is displayed via a multi windowed user interface including:

  • Alarm & warning indicators
  • Block, Rolling and Partial averages
  • Trend charts
  • Bar charts
  • Data grid displays user defined averaged data in textual and graphical format
  • Unlimited window layouts can be saved by the operator / user
  • Error and Event logs storing all alarms, systems warnings and maintenance
  • System Auditing provides details of all logins / logouts and changes or attempted changes to the system
  • QAL3 Control Charts
  • Comprehensive online HELP manual

Being multi windowed and having the ability to re-size each window, CEMWindows looks great equally on a large flat panel or a standard sized monitor. Operators who want to view multiple windows can use two large monitors if desired.

All displays have:

  • Selectable units of measurement
  • Selectable Raw, Validated and Adjusted (QAL2 Calibration function & Uncertainty) readings, user-defined measurements and averages that have been configured within the system
  • Historical data from commissioning onwards is accessible via the trend and reporting facilities.


Configurable warning levels and Emission Limit Values (ELV) alarm levels can alert users of impending or actual ELV breaches via:-

  • On screen warnings
  • Email
  • SMS / Text message 
  • Plant wide audible sirens 
  • Physical warning lights

Configurable Partial Averaging can be used to alert users of impending breaches giving operators time to make plant adjustments before ELVs are breached.

Configurable reporting

User-definable report generation allows for submission of data to local inspectors and the Environment Agency in the required formats for the site and in bespoke formats specified by the end-user.

Reports access data immediately on its creation to provide the most up-to-date measurement and system statuses. Any date range can be queried, and this range can even be selectable to an accuracy of 1 second.

This also includes historical data from the date of commissioning and report types are as follows:

  • User Configurable Averaged Data Report
  • System Configuration Report

Data access

All data can also be exported in a variety of formats for external examination and processing. This can assist with maximising plant efficiencies and diagnosing potential problems with the plant processes.

Data can be accessed via common communication protocols such as MODBUS, RS485, ProfiBUS, FieldBUS, ODBC, analogue signals, OPC, CSV export and others on request.

Live Data Feeds

Monitoring data can be selected and exported in real-time for use in 3rd party systems at time periods of the user’s choice.

Distributed Access

CEMWindows can be accessed directly at a remote terminal using the CEMWindows User Interface (UI) or it can be distributed via a site network to multiple users or accessed over a secure LAN via the Internet