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OXYMAT 6 气体分析仪的功能基于测量顺磁压力变化的方式，用于测量气体中含氧量。

Paramagnetic alternating pressure principle

Small measuring ranges (0 to 0.5% or 99.5 to ** O2)

Absolute linearity

Detector element has no contact with the sample gas

Can be used under "harsh conditions"

Long service life

Physically suppressed zero through suitable selection of reference gas (air or O2), e.g. 98 to ** O2 for purity monitoring/air separation

Open interface architecture (RS 485, RS 232, PROFIBUS)

SIPROM GA network for maintenance and service information (option)

Electronics and physics: gas-tight isolation, purging is possible, IP65, long service life even in harsh environments (field device only)

Heated versions (option), use also in presence of gases condensing at low temperature (field device only)

Ex(p) for zones 1 and 2 according to ATEX 2G and ATEX 3G (field device only)

For boiler control in combustion plants

For safety-relevant applications (SIL)

In the automotive industry (testbed systems)

In chemical plants

For ultra-pure gas quality monitoring

Environmental protection

Quality monitoring

Versions for analyzing flammable and non-flammable gases or vapors for use in hazardous areas

Special versions

Special applications

Besides the standard combinations, special applications concerning the material in the gas path and the material in the sample chambers are also available on request.

Performance-tested version / QAL

As a reference value for emission measurements according to German Technical Instructions on Air Quality Control (TA Luft), 13th and 27th BlmSchV, federal emission law

19" rack unit

With 4 U for installation

In hinged frame

In cabinets with or without telescopic rails

Front plate can be swung down for servicing purposes (laptop connection)

Internal gas paths: hose made of FKM (Viton) or pipe made of titanium or stainless steel (mat. no. 1.4571)

Gas connections for sample gas inlet and outlet and for reference gas: Fittings, pipe diameter of 6 mm or ¼"

Flow indicator for sample gas on front plate (option)

Pressure switch in sample gas path for flow monitoring (option)

Field device

Two-door enclosure with gas-tight separation of analyzer and electronics sections

Individually purgeable enclosure halves

Analyzer unit and piping can be heated up to 130 °C (option)

Gas path and stubs made of stainless steel (mat. no. 1.4571) or titanium, Hastelloy C22

Purging gas connections: pipe diameter 10 mm or 3/8"

Gas connections for sample gas inlet and outlet and for reference gas: Clamping ring connection for a pipe diameter of 6 mm or ¼"

Display and operator panel

Large LCD panel for ltaneous display of:

Measured value (digital and analog displays)

Status bar

Measuring ranges

Contrast of LCD panel adjustable using menu

Permanent LED backlighting

Washable membrane keyboard with five softkeys

Menu-driven operation for parameterization, test functions, adjustment

User help in plain text

Graphic display of concentration trend; programmable time intervals

Bilinl operating software German/English, English/Spanish, French/English, Spanish/English, Italian/English

Inputs and outputs

One analog output per medium (from 0, 2, 4 to 20 mA; NAMUR parameterizable)

Two analog inputs configurable (e.g. correction of cross-interference, external pressure sensor)

Six digital inputs freely configurable (e.g. for measuring range switchover, processing of external **s from sample preparation)

Six relay outputs freely configurable (failure, maintenance demanded, maintenance switch, limit alarm, external solenoid valves)

Expansion: Eight additional digital inputs and eight additional relay outputs each e.g. for autocalibration with up to four calibration gases

Communication

RS 485 present in basic unit (connection from the rear; for the slide-in module also behind the front plate).

Options

AK interface for the automotive industry with extended functions

RS 485/RS 232 converter

RS 485/Ethernet converter

RS 485/USB converter

Connection to networks via PROFIBUS DP/PA interface

SIPROM GA software as the service and maintenance tool

OXYMAT 6, membrane keyboard and graphic display

Designs – Parts wetted by sample gas, standard

Options

Gas path (19" rack unit)

Gas path, reference gas connection 1 100 hPa, absolute

Gas path, reference gas connection 3 000 to 5 000 hPa, absolute

Gas path (field device)

Gas path, reference gas connection 1 100 hPa, absolute

Gas path, reference gas connection 3 000 to 5 000 hPa, absolute

In contrast to almost all other gases, oxygen is paramagnetic. This property is utilized as the measuring principle by the OXYMAT 6 gas analyzers.

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.

In the case of OXYMAT 6, 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 ** by a microflow sensor (4).

The microflow sensor consists of two nickel-plated grids heated to approximately 120 ºC, 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 for the OXYMAT 6.

Vibrations frequently occur at the place of installation and may falsify the measured ** (noise). A further microflow sensor (10) through which no gas passes acts as a vibration sensor. Its ** is applied to the measured ** 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).

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.

OXYMAT 6, mode of operation

Advantages of the function-based application of reference gas

The zero point can be defined specific to the application. It is then also possible to set "physically" suppressed zero points. For example, it is possible when using pure oxygen as the zero gas to set a measuring range of 99.5 to ** O2 with a resolution of 50 vpm.

The sensor (microflow sensor) is located outside the sample gas. Through use of an appropriate material in the gas path, this also allows measurements in highly corrosive gases.

Pressure variations in the sample gas can be compensated better since the reference gas is subjected to the same fluctuations.

No influences on the thermal conductivity of the sample gas since the sensor is positioned on the reference gas side.

The same gas is used for the zero gas calibration and as the reference gas. As a result of the low reference gas consumption (3 to 10 ml/min), one calibration gas cylinder can be used for both gases.

No measuring effect is generated in the absence of oxygen. The measured ** need not therefore be set electronically to zero, and is thus extremely stable with regard to temperature and electronic influences.

Main features

Four measuring ranges which can be freely configured, even with suppressed zero point; all measuring ranges are linear

Measuring ranges with physically suppressed zero point possible

Measuring range identification

Electrically isolated measured value output 0/2/4 through to 20 mA (including inverted)

Choice of automatic or manual measuring range switchover; remote switching is also possible

Storage of measured values possible during calibration

Wide range of selectable time constants (static/dynamic noise damping); i.e. the response time of the device can be adapted to the respective measuring task

Short response time

Low long-term drift

Measuring point switchover for up to 6 measuring points (parameterizable)

Measuring point identification

Internal pressure sensor for correction of pressure variations in sample gas range 500 to 2 000 hPa (abs.)

External pressure sensor - only with piping as the gas path - can be connected for correction of variations in the sample gas pressure up to 3 000 hPa absolute (option)

Monitoring of sample gas flow (option for version with hoses)

Monitoring of sample gas and/or reference gas (option)

Monitoring of reference gas with reference gas connection 3 000 to 5 000 hPa (abs.) (option)

Automatic measuring range calibration parameterizable

Operation based on NAMUR recommendation

Two control levels with separate authorization codes for the prevention of accidental and unauthorized operator interventions

Simple handling using a numerical membrane keyboard and operator prompting

Custom-made device designs, such as:

Customer acceptance

TAG plates

Drift recording

Clean for O2 service

Kalrez gaskets

Analyzer unit with flow-type compensation circuit: a flow is passed through the compensation branch (option) to reduce the vibration dependency in the case of sample and reference gases with significantly different densities

Sample chamber for use in presence of highly corrosive sample gases

Reference gases for OXYMAT 6

1) Suppressed zero point with measuring range end value 100 vol.% O2.

2) Suppressed zero point with 21 vol.% O2 within the measuring span.

Correction of zero-point error/cross-sensitivities

Zero point error due to diamagnetism or paramagnetism of some accompanying gases with reference to nitrogen at 60 °C und 1 000 hPa absolute (according to IEC 1207/3)

Conversion to other temperatures

The zero point deviations listed in the table must be multiplied by an adjustment factor (k):

with diamagnetic gases: k = 333 K / (ϑ [°C] + 273 K)

with paramagnetic gases: k = [333 K / (ϑ [°C] + 273 K)]2

All diamagnetic gases have a negative zero point deviation.