7MB8000-2CA

OXYMAT 6, field device

General information

Measuring ranges

4, internally and externally switchable; autoranging is also possible

Smallest possible span (relating to sample gas pressure 1 000 hPa absolute, 0.5 l/min sample gas flow and 25 °C ambient temperature), smallest possible span with heated version: 0.5% (< 65 °C); 0.5 … 1% (65 … 90 °C); 1 … 2% (90 … 130 °C))

0.5 vol.%, 2 vol.% or 5 vol.% O₂

Largest possible measuring span

100 vol.% O₂(for a pressure above 2 000 hPa: 25 vol.% O₂)

Measuring ranges with suppressed zero point

Any zero point can be implemented within 0 … 100 vol.%, provided that a suitable reference gas is used (see Table 1 in "Function")

Operating position

Front wall, vertical

Conformity

CE mark in accordance with EN 50081-1, EN 50082-2

Design, enclosure

Degree of protection

IP65 in accordance with EN 60529, restricted breathing enclosure to EN 50021

Weight

Approx. 28 kg

Electrical characteristics

Power supply

100 … 120 V AC (nominal range of use 90 … 132 V), 48 … 63 Hz or 200 … 240 V AC (nominal range of use 180 … 264 V), 48 … 63 Hz

Power consumption

Approx. 35 VA, approx. 330 VA with heated version

EMC (ElectromagneticCompatibility)

In accordance with standard requirements of NAMUR NE21 (08/98), EN 61326, EN 50270 (with gas warning unit)

Electrical safety

In accordance with EN 61010-1

• Heated units

Overvoltage category II

• Unheated units

Overvoltage category III

Fuse values (unheated unit)

• 100 ... 120 V

F3: 1 T/250; F4: 1 T/250

• 200 ... 240 V

F3: 0.63 T/250; F4: 0.63 T/250

Fuse values (heated unit)

• 100 ... 120 V

F1: 1 T/250; F2: 4 T/250

F3: 4 T/250; F4: 4 T/250

• 200 ... 240 V

F1: 0.63 T/250; F2: 2.5 T/250

F3: 2.5 T/250; F4: 2.5 T/250

Gas inlet conditions

Permissible sample gas pressure

• With pipes

500 … 3 000 hPa absolute

• With pipes, Ex version

• Leakage compensation

500 … 1 160 hPa absolute

• Continuous purging

500 … 3 000 hPa absolute

Reference gas pressure (high-pressure version)

2 000 ... 4 000 hPa above sample gas pressure, but max. 5 000 hPa

Reference gas pressure (low-pressure version)

Min. 100 hPa above sample gas pressure

Purging gas pressure

• Permanent

< 165 hPa above ambient pressure

• For short periods

Max. 250 hPa above ambient pressure

Sample gas flow

18 … 60 l/h (0.3 … 1 l/min)

Sample gas temperature

• Min. 0 to max. 50 °C, but above the dew point (unheated)
• 15 °C above temperature analyzer unit (heated)

Sample gas humidity

< 90% relative humidity

Dynamic response

Warm-up period

At room temperature < 30 min (the technical specification will be met after 2 hours)

Delayed display (t₉₀-time)

< 1.5 s

Damping (electrical time constant)

0 … 100 s, parameterizable

Dead time (purging time of the gas path in the unit at 1 l/min)

Approx. 0.5 s

Time for device-internal signal processing

< 1 s

Pressure correction range

Pressure sensor

• Internal

500 … 2 000 hPa absolute

• External

500 … 3 000 hPa absolute

Measuring response(relating to sample gas pressure 1 013 hPa absolute, 0.5 l/min sample gas flow and 25 °C ambient temperature)

Output signal fluctuation

< ± 0.75% of the smallest possible measuring range according to rating plate, with electronic damping constant of 1 s (corresponds to ± 0.25% at 2  )

Zero point drift

< ± 0.5%/month of the smallest possible span according to rating plate

Measured-value drift

< ±0.5%/month of the current measuring range

Repeatability

< 1% of the current measuring range

Detection limit

1% of the current measuring range

Linearity error

< 0.1% of the current measuring range

Influencing variables(relating to sample gas pressure 1 013 hPa absolute, 0.5 l/min sample gas flow and 25 °C ambient temperature)

Ambient temperature

< 0.5%/10 K relating to the smallest possible measuring range according to rating plate, with measuring span 0.5%: 1%/10 K

Sample gas pressure (with air (100 hPa) as reference gas, correction of the atmospheric pressure fluctuations is only possible if the sample gas can vent to ambient air)

• When pressure compensation is switched off: < 2% of the current measuring range/1% pressure change
• When pressure compensation is switched on: < 0.2% of the current measuring range/1% pressure change

Carrier gases

Deviation from zero point corresponding to paramagnetic or diamagnetic deviation of carrier gas

Sample gas flow at zero point

< 1% of the current measuring range according to rating plate with a change in flow of 0.1 l/min within the permissible flow range; heated version up to double error

Power supply

< 0.1% of the current measuring range with rated voltage ± 10%

Electrical inputs and outputs

Analog output

0/2/4 … 20 mA, isolated; max. load 750 

Relay outputs

6, with changeover contacts, freely parameterizable, e.g. for measuring range identification; load: 24 V AC/DC/1 A, isolated

Analog inputs

2, dimensioned for 0/2/4 ... 20 mA for external pressure sensor and residual gas influence correction (correction of cross-interference)

Binary inputs

6, designed for 24 V, isolated, freely parameterizable, e.g. for measuring range switchover

Serial interface

RS 485

Options

AUTOCAL function with 8 additional binary inputs and relay outputs each, also with PROFIBUS PA or PROFIBUS DP

Climatic conditions

Permissible ambient temperature

-30 … +70 °C during storage and transportation, 5 … 45 °C during operation

Permissible humidity

< 90% RH (relative humidity) as annual average (maximum accuracy achieved after 2 hours), during storage and transportation (dew point must not be undershot)