D-R 290 dust concentration measuring instrument Siemens
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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 |
|
Measuring ranges | |
| 0 ... 20 to 0 ... 100 % |
| 0 ... 0.1 to 0 ... 1.6 |
| 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 |
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.