D-R 290 dust concentration measuring instrument Siemens

Область применения



The D-R 290 monitors not only the efficiency of the filter plants by registering the residual dust content, but also reports instantaneously when permissible levels of dust or flue gas emissions are exceeded. As a result it is often possible to intervene directly in the process of the plant to be monitored and thus ensure reliable compliance with the specified limit values.

Areas of application

  • Furnace plants with semi-anthracite coal, brown coal, fuel oil and combined heating
  • Converter plants, asphalt mixing plants
  • Cement manufacturing plants

Approvals

  • Suitability-tested by the TÜV Cologne, test report 936/801017
  • Certified according to DIN EN 15267-3
  • Itemized in the list of suitable measuring devices for continuous emission measuring
  • MCERTS

Обзор



The D-R 290 is an optical opacity/dust monitor for plants with small to medium dust concentrations.

Дизайн



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

Функции



The device operates using the double-pass method according to the auto-collimation principle. The light beam traverses the measuring distance twice. The attenuation of the light beam by the dust content in the measuring section is measured and evaluated.

Особенности


  • In-situ measuring procedure, continuous measurement
  • Semiconductor source with long service life
  • Super-wide band diodes (SWBD), which provides more stable measuring results in comparison to devices with conventional LEDs
  • Powerful microprocessor technology
  • Measured value display on LC display in opacity, extinction or in mg/m3
  • Automatic function tests with correction of measured values in relation to soiling
  • Optics and electronics in a hermetically sealed unit - no smoke gas can enter device
  • Easy adjustment without additional equipment
  • Low-maintenance thanks to optimal purge air conduction
  • Heated end plate

Технические данные



Measuring instrument D-R 290

 

Measurements

  • Opacity
  • Extinction

Measuring ranges

 
  • Opacity

0 ... 20 to 0 ... 100 %

  • Extinction

0 ... 0.1 to 0 ... 1.6

  • Dust 1)

0 ... 80 mg/m3 to 0 ... 4 000 mg/m3

Measuring principle

Transmission

Sample gas temperature

Above dew point up to 250 °C, optional up to 1 000 °C, depending on application

Sample gas pressure

-50 ... +20 hPa, optional higher

Duct diameter

1 ... 12 m, optional up to 18 m

Ambient temperature

-20  ... +50 °C, optional higher

Degree of protection

IP65, Ex optional

Measured value outputs

2 x 0/4 ... 20 mA, 500 Ω
Manual or automatic measurement range switching
optional Modbus RTU, PROFIBUS DP

Digital outputs

6 programmable relay outputs, permissible load 48 V/0.5 A

Digital inputs

6 programmable isolated inputs

Accuracy

< 1 % of measuring range

Detection limit

0.75 % at extinction 0–0.1

Reference point drift

< 0.4 % of measuring range / month

Zero point drift

< 0.4 % of measuring range / month

Auxiliary power

95 ... 264 V AC, 47 ... 63 Hz, 30 VA

Dimensions (H x W x D) measuring head

363 x 185 x 398 mm

Weight

17 kg

Purge air supply

 

Purge air quantity

Approx. 80 m3/h

Auxiliary power

115/230 V AC, 50/60 Hz, 0.37/0.43 kW

Dimensions (H x W x D)

350 x 550 x 500 mm

Weight

12 kg

Degree of protection

IP55



1) With reference to one meter of path length after gravimetric calibration

Дальнейшая информация



Please consult your Siemens sales partner for information on how to correctly configure and order a D-R 290 measuring instrument for a Siemens CEMS project.