Colorimetric gas detection systems from Draeger

The Draeger Chemlogic range of colorimetric gas detection systems is well suited for the detection of low levels of toxic and corrosive gases.

These include diisocyanates such as MDI (Methylene diphenyl di-isocyanate) and TDI (Toluene di-isocyanate) found in the manufacture of polyurethane foams, some spray paints and in specialised printing on plastic surfaces.

The Chemlogic series forms part of a new generation of interference-free, low maintenance, continuous monitors and provides increased measurement via fibre optics.

The Chemlogic 1 is a single-point detector.

For those applications requiring greater monitoring capability, the Chemlogic 8 has eight detection points and an optimised flow that is able to draw samples twice as fast as other multi-point systems at 250-300ft 2.5 LPM.

The use of fibre optics enables improved focus and direction of light as well as a better signal-to-noise ratio.

In addition, by removing the use of O-rings, the system ensures a cleaner interface between the optic, sample stream and tape.

Innovative in design and including a 'reference' LED, the Chemlogic is able to reduce maintenance time by automatically adjusting the LED brightness.

It can also help to avoid costly false alarms by sensing LED intensity shifts.

A new tri-coloured LED (RGB) has also been incorporated to provide the greater optical flexibility and colour spectrum requirements needed for different colorimetric reactions.

Another feature is the 'tape-saver mode'.

When a gas reaches a selected concentration, the system will automatically take and hold one reading, waiting a user-determined time before taking another reading (<50 minutes).

Benefiting from a two-month tape cassette (optional four months with the Chemlogic 8) and the system's ability to use tape more efficiently, it has also reduced both the tape replacement intervals and operating costs.

Versatile in use, the alarm levels, ranges and gases are all user selected, and each of the outputs are easily tested.

With built-in compact flash card technology and data-logging capabilities, the Chemlogic 1 provides an integral log of event history.

The Chemlogic 8 features a main analysis screen showing all eight points at any one time to identify concentration, point status and gas type.

The event history automatically creates a back-up data file which can be viewed on screen or downloaded to an Excel-compatible file.

Supplied with both relay and universal 4-20mA outputs, the Chemlogic can be connected to any 4-20mA control system, such as the Draeger Regard.

For ease-of-use it has also been designed to directly replace previous or obsolete models by utilising the same outputs, all terminated within a standardised harness connector.

Options such as Ethernet, Device Net, Profibus and Modbus are also available to allow further network flexibility.

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