D-RX 250 combination probe Siemens
![](https://pzip.ru/Images/Siemens/cat/P_PA10_XX_00177i.jpg)
Область применения
By combining four selected measuring functions in a single device it is possible to automatically calculate the pollutant mass flow for the preparation of the emission declaration in addition to monitoring the pollutant dust.
Areas of application
- For measurements in accordance with TIA Air (Technical Instructions for Maintaining Air Purity) 13., 17. and 27. BlmSchV
- Not suitable for use behind electrostatic precipitators
Approvals
- Suitability-tested by the TÜV Cologne, test report 936/800006/A
- Itemized in the list of suitable measuring devices for continuous emission measuring
- MCERTS
Обзор
The combined probe sensor D-RX 250 is a single rod measurement probe for simultaneous measurement of dust concentration, volume flow, temperature and absolute pressure.
Дизайн
System components D-RX 250
Probe
The probe consists of the probe measuring rod and the measured value processing by the electronics in the measuring head. The probe measuring rod is a probe section that protrudes into the dust duct and is fastened with a flange in the duct. The probe measuring rod is insulated in design because of the triboelectric measurement and has two chambers for differential pressure measurement. The two chambers for pressure measurement are connected to a differential pressure transmitter. One of the two chambers is also connected to the absolute pressure transducer in the transmitter. The gas temperature is measured via a measurement resistance in a third chamber in the center of the probe section. The electronic measured value processing is performed in the probe housing. The temperature of the measurement resistance and the triboelectric raw value are determined here. The two raw values of temperature and tribo signal are transferred digitally to the transmitter.
Differential pressure transducer
The differential pressure transducer converts the differential pressure, created by the gas flowing in the probe measuring rod, into a gas velocity variable.
Transmitter
The transmitter provides the supply voltages for the probe and the measuring transducer for absolute pressure and differential pressure, reads in the raw measured values of these modules and transfer the measured values via the RS-485 interface to the evaluation unit. Through the RS-485 interface the transmitter reads the probe values of the triboelectric measured signal and the temperature.
The differential pressure transducer is connected to the transmitter by means of a two-wire cable. The absolute pressure transducer is located inside the transmitter housing. It receives the pressure from the chamber via a special rod.
Control and evaluation unit
The control and evaluation unit reads out the raw measured values from the transmitter. The measured values for normalized dust concentration and normalized volume flow are calculated in the unit.
It is possible to output all analog values via Modbus or 4/20-mA signals and all status signals via isolated contacts.
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.
Optional:
- Weather protection cover
- Change-over cock for back purging/zero point control
- Automatic cyclical probe back purging for high dust concentrations
- Hastelloy probes for corrosive gases
- Purge air connection at flange
Функции
Dust concentration
The dust concentration is calculated according to the triboelectric measuring principle. The tribo probe measures the electrical charge of the incident particles.
Volume flow
The measurement of the volume flow is based on the mechanical action principle. The probe has two separate chambers, between which a differential pressure builds up under flow.
Absolute pressure
The absolute pressure in the flue gas is measured by a pressure transmitter in one chamber of the probe.
Temperature
The temperature is measured directly in the center of the flue gas in a separate chamber within the probe with a temperature sensor.
Особенности
- Only one probe/installation opening in the exhaust gas channel
- Compact design, no moving parts, no consumable parts
- Continuous conversion to normalized dust concentration in mg/Nm3 and to normalized volume flow in Nm3/h
- LCD display in mg/Nm3, Nm3/h, °C and hPa, one analog output for each measurement value
- Parameterization at the control unit without the need of a PC or other tools
- Remote connection of control and evaluation unit via two-wire bus interface up to 1000 m
Технические данные
D-RX 250 combined probe sensor | |
Measurements |
|
Measuring ranges |
|
Measuring principle | |
| Tribo electric |
| Differential pressure |
Sample gas temperature | Above dew point up to 200 °C, optional up to 350 °C |
Sample gas humidity | < 80 % |
Sample gas pressure | -200 ... +200 hPa |
Duct diameter | 0.3 ... 5 m |
Ambient temperature | -20 ... +50 °C |
Degree of protection | IP65 |
Measured value outputs | 4 x 0/4 ... 20 mA, 500 Ω |
Digital outputs | 7 relay outputs, permissible load 48 V/0.5 A |
Digital inputs | 6 isolated inputs |
Accuracy | < 2 % of the measuring range |
Detection limit | < 2 % of the measuring range |
Reference point drift | < 1 % of measuring range / month |
Zero point drift | < 1 % of measuring range / month |
Auxiliary power | 115/230 V AC, 50/60 Hz, 50 VA |
Dimensions | |
| 180 x 180 x (340 + probe length) mm |
| 250/400/700/1 000 mm |
Weight | |
| 9.5 kg |
| 22 kg |
Options | |
Probe back purging, purge air supply | 3 bar |
Isolator purging, continuous purge air supply | Approx. 2 m3/h |
1) Flue gas velocity > 5 m/s concentration after gravimetric calibration
Дальнейшая информация
Please consult your Siemens sales partner for information on how to correctly configure and order a D-RX 250 combined probe sensor for a Siemens CEMS project.