ENG_822022.xml
- Measurement for boiler control in combustion plants
- Emission measurements in combustion plants
- Process gas concentrations in chemical plants
- Trace measurements in pure gas processes
- Environmental protection
- TLV (Threshold Limit Value) monitoring at the workplace
- Quality monitoring
Special versions
Special applications
Besides the standard combinations, special applications concerning material in the gas path, material in the sample chambers (e.g. titanium, Hastelloy C22) and measured components are available on request.
Performance-tested version / QAL
For measurements of CO, NO, SO2 and O2 according to sections 13 and 27 of the German Federal Immission Protection Regulations and TA Luft, performance-tested versions according to EN 15267 of the ULTRAMAT/OXYMAT 6 are available.
Certified measuring range:
- 1-component analyzer
CO: 0 to 75 mg/m³; 0 to 10 000 mg/m³
NO: 0 to 100 mg/m3; 0 to 10 000 mg/m³
SO2: 0 to 75 mg/m3; 0 to 1 500 mg/m³
- O2: 0 to 5 vol.%; 0 to 25 vol.%
All larger measuring ranges are also approved.
In addition, performance-tested versions of the ULTRAMAT/OXYMAT 6 meet the requirements set forth in EN 14956 and QAL1 according to EN 14181. Conformity of the analyzers with both standards is TÜV-certified.
Determination of the analyzer drift according to EN 14181 (QAL3) can be carried out manually or also with a PC using the SIPROM GA maintenance and servicing software. In addition, selected manufacturers of emission evaluation computers offer the possibility for downloading the drift data via the analyzer's serial interface and to automatically record and process it in the evaluation computer.
Flow-type reference cell
- The flow through the reference cell should be adapted to the sample gas flow
- The gas supply of the reduced flow-type reference cell should have a primary pressure of 3 000 to 5 000 hPa (abs.). Then a restrictor will automatically adjust the flow to approximately 8 hPa
ENG_822020.xml
ULTRAMAT channel
The ULTRAMAT channel operates according to the infrared two-beam modulated light principle with double-layer detector and optical coupler.
The measuring principle is based on the molecule-specific absorption of bands of infrared radiation. The absorbed wavelengths are characteristic to the individual gases, but may partially overlap. This results in cross-sensitivities which are reduced to a minimum by the following measures:
- Gas-filled filter cell (beam divider)
- Double-layer detector with optical coupler
- Optical filters if necessary
The figure shows the measuring principle. An IR source (1) which is heated to approx. 700 °C and which can be shifted to balance the system is divided by the beam divider (3) into two equal beams (sample and reference beams). The beam divider also acts as a filter cell.
The reference beam passes through a reference cell (8) filled with N2 (a non-infrared-active gas) and reaches the right-hand side of the detector chamber (11) practically unattenuated. The sample beam passes through the sample chamber (7) through which the sample gas flows and reaches the left-hand side of the detector (10) attenuated to a lesser or greater extent depending on the concentration of the sample gas. The detector chamber is filled with a defined concentration of the gas component to be measured.
The detector is designed as a double-layer detector. The center of the absorption band is preferentially absorbed in the upper detector layer, the edges of the band are absorbed to approximately the same extent in the upper and lower layers. The upper and lower detector layers are connected together via the microflow sensor (12). This coupling means that the spectral sensitivity has a very narrow band.
The optical coupler (13) lengthens the lower detector chamber layer optically. The infrared absorption in the second detector chamber layer is varied by changing the slider position (14). It is thus possible to individually minimize the influence of interfering components.
A chopper (5) rotates between the beam divider and the sample chamber and interrupts the two beams alternately and periodically. If absorption takes place in the sample chamber, a pulsating flow is generated between the two detector levels which is converted by the microflow sensor (12) into an electric signal.
The microflow sensor consists of two nickel-plated grids heated to approximately 120 °C, which, along with two supplementary resistors, form a Wheatstone bridge. The pulsating flow together with the dense arrangement of the Ni grids causes a change in resistance. This leads to an offset in the bridge, which is dependent on the concentration of the sample gas.
Note
The sample gases must be fed into the analyzers free of dust. Condensation in the sample chambers must be prevented. Therefore, the use of gas modified for the measuring task is necessary in most application cases.
As far as possible, the ambient air of the analyzer unit should not have a large concentration of the gas components to be measured.
Flow-type reference cells with reduced flow must not be operated with flammable or toxic gases.
Flow-type reference cells with reduced flow and an O2 content > 70% may only be used together with Y02.
Channels with electronically suppressed zero point only differ from the standard version in the measuring range parameterization.
Physically suppressed zeros can be provided as a special application.
G_PA10_XX_00063
ULTRAMAT channel, principle of operation
OXYMAT channel
In contrast to almost all other gases, oxygen is paramagnetic. This property is utilized as the measuring principle by the OXYMAT channel.
Oxygen molecules in an inhomogeneous magnetic field are drawn in the direction of increased field strength due to their paramagnetism. When two gases with different oxygen contents meet in a magnetic field, a pressure difference is produced between them.
One gas (1) is a reference gas (N2, O2 or air), the other is the sample gas (5). The reference gas is introduced into the sample chamber (6) through two channels (3). One of these reference gas streams meets the sample gas within the area of a magnetic field (7). Because the two channels are connected, the pressure, which is proportional to the oxygen content, causes a cross flow. This flow is converted into an electric signal by a microflow sensor (4).
The microflow sensor consists of two nickel-plated grids heated to approximately 120 °C, which, along with two supplementary resistors, form a Wheatstone bridge. The pulsating flow results in a change in the resistance of the Ni grids. This leads to an offset in the bridge which is dependent on the oxygen concentration of the sample gas.
Because the microflow sensor is located in the reference gas stream, the measurement is not influenced by the thermal conductivity, the specific heat or the internal friction of the sample gas. This also provides a high degree of corrosion resistance because the microflow sensor is not exposed to the direct influence of the sample gas.
By using a magnetic field with alternating strength (8), the effect of the background flow in the microflow sensor is not detected, and the measurement is thus independent of the sample chamber position as well as the gas analyzer's operating position.
The sample chamber is directly in the sample path and has a small volume, and the microflow sensor is a low-lag sensor. This results in a very short response time.
Vibrations frequently occur at the place of installation and may falsify the measured signal (noise). A further microflow sensor (10) through which no gas passes acts as a vibration sensor. Its signal is applied to the measured signal as compensation.
If the density of the sample gas deviates by more than 50% from that of the reference gas, the compensation microflow sensor (10) is flushed with reference gas just like the measuring sensor (4) (option).
Note
The sample gases must be fed into the analyzers free of dust. Condensation in the sample chambers must be prevented. Therefore, gas modified for the measuring tasks is necessary in most application cases.
G_PA10_XX_00040
OXYMAT channel, principle of operation
