7MB8000-5AA

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))

0.5В vol.%, 2В vol.% or 5 vol.%В O₂

Largest possible measuring span

100В vol.% O₂ (for a pressure above 2В 000В 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 ENВ 50081-1, EN 50082-2

Design, enclosure

Degree of protection

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

Weight

Approx. 28 kg

Electrical characteristics

Auxiliary power

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

EMC (electromagnetic compatibility)

In accordance with standard requirements of NAMUR NE21 (08/98), ENВ 61326

Electrical safety

In accordance with ENВ 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)

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

Reference gas pressure (low-pressure version)

Min. 100В hPa above sample gas pressure

Purging gas pressure

• Permanent

<В 165В hPa above ambient pressure

• For short periods

Max. 250В hPa above ambient pressure

Sample gas flow

18 … 60 l/h (0.3 … 1 l/min)

Sample gas temperature

• Min. 0 to max. 50В В°C, but above the dew point (unheated)
• 15В В°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, configurable

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

Approx. 0.5В s

Time for device-internal signal processing

<В 1В s

Pressure correction range

Pressure sensor

• Internal

500 … 2 000 hPa absolute

• External

500 … 3 000 hPa absolute

Measuring response

Based on sample gas pressure 1В 013В hPa absolute, 0.5В l/min sample gas flow and 25В В°C ambient temperature

Output signal fluctuation

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

Zero point drift

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

Measured-value drift

<В В±0.5%/month of the current measuring range

Repeatability

<В 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

Based on sample gas pressure 1В 013В hPa absolute, 0.5В l/min sample gas flow and 25В В°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%/10В K

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

• With disabled pressure compensation: <В 2% of the current measuring range /1% pressure change
• With disabled pressure compensation: <В 0.2% of the current measuring range /1% pressure change

Accompanying gases

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

Sample gas flow at zero point

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

Auxiliary power

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

Electrical inputs and outputs

Analog output

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

Relay outputs

6, with changeover contacts, freely configurable, e.g. for measuring range identification; load: 24В V AC/DC/1В 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)

Digital inputs

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

Serial interface

RSВ 485

Options

AUTOCAL function each with 8 additional digital inputs and relay outputs, also with PROFIBUSВ PA or PROFIBUSВ DP

Climatic conditions

Permissible ambient temperature

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

Permissible humidity

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