C79451-A3480-D511

General information

Measuring ranges

4, internally and externally switchable; autoranging is also possible

Smallest possible span (relating to sample gas pressure 1В 000В hPa absolute, 0.5 l/min sample gas flow and 25В В°C ambient temperature)

2В vol.% or 5В vol.% O₂

Largest possible measuring span

100В vol.% O₂

Measuring ranges with suppressed zero point

Any zero point within 0В ... 100 vol.% can be implemented, provided that a suitable reference gas is used

Operating position

Front wall, vertical

Conformity

CE mark in accordance with ENВ 50081-1 and ENВ 50082-2

Design, enclosure

Degree of protection

IP20 according to ENВ 60529

Weight

Approx. 13 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. 45В VA

EMC (electromagnetic compatibility)

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

Electrical safety

According to EN 61010-1, overvoltage categoryВ III

Fuse values

100В ...В 120 V: 1.0 T/250

200В ...В 240 V: 0.63 T/250

Gas inlet conditions

Permissible sample gas pressure

• External reference gas supply

800 … 1 200 hPa absolute

• With integrated pump

Atmospheric pressure В±50В hPa

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

Sample gas humidity

< 90% relative humidity

Reference gas pressure (high-pressure version)

2В 000В to 4В 000 hPa above sample gas pressure, but max. 5В 000В hPa absolute (version without reference gas pump)

Reference gas pressure (low-pressure version) with external pump

Min. 100В hPa above sample gas pressure

Dynamic response

Warm-up period

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

Delayed display (T₉₀)

3.5В s

Damping (electrical time constant)

0В ...В 100 s, configurable

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

Approximately 0.5 ... 2.5 s, depending on version

Time for device-internal signal processing

<В 1В s

Pressure correction range

Pressure sensor internal

500 … 2 000 hPa, absolute
(see gas inlet conditions for permissible sample gas pressure)

Measuring response

Based on sample gas pressure 1В 013В hPa absolute, 0.5 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±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

<В 1% of the current measuring range

Influencing variables

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

Ambient temperature

< 1 % of the current measuring range/ 10В K

Zero offset: < 0.1 vol.% O₂ absolute/10 K

Sample gas pressure (with air (100В hPa) as internal reference gas supply, 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 enabled 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 accompanying gas (see table)

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

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, floating; 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, floating

Analog inputs

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

Digital inputs

6, designed for 24 V, floating, 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

< 90% relative humidity as annual average, during storage and transportation (must not fall below dew point)