System components D-R 290

Measuring head

The transmitter and receiver optics are integrated together with the electronics in a rugged and robust aluminum housing. The measuring head is mounted on the weld-in flange.

Reflector

The reflector is installed in a rugged and robust aluminum housing. The reflector is mounted on the weld-in flange directly opposite the measuring head.

Evaluation unit

The D-R 290 measuring system is connected to and operating on the evaluation unit. The evaluation unit is connected to the measuring head by means of an approx. 2 m long cable.

Purge air unit

A hose connects the measuring head and the reflector with the purge air unit. The filtered air is used to keep clean the scattered light interfaces of the measuring head and the reflector.

Optional:

Quick-closing shutters

The quick-closing shutters are mounted on the measuring head and the reflector side between the weld-in flanges and the connected devices (measuring head, reflector). In the event of a fault (failure of the power supply or purge air) they automatically close the path between the exhaust gas duct and the measuring equipment.

Electronics for quick-closing shutter

A control electronics is required for each quick-closing shutter.

Measured-value acquisition

In the simplest case a recorder is used to record the measured values and the reference values. The measured values and status signals that are output can also be fed into an emission calculator system for further processing.

Weather protection covers

Weather protection covers are available to protect the measuring head, the reflector, the purge air unit and the terminal boxes when the measuring system is installed outdoors.

Additional options:

• Bus interface, for example, Modbus or similar
• Explosion proof design for EEx p, Zone 1 or Zone 2
• With an additional display unit at the measuring location, the control and display unit can be installed at a distance of up to 1000 m away
• Temperature compensation through additional analog input
• Special model for measuring distances up to 18 m with 2 purge air units
• Filter set for sensitivity and linearity control