7MB2121-.....-....

General information

Measuring ranges

4, internally and externally switchable; autoranging is also possible

Smallest possible measuring range

Dependent on the application: e.g. CO: 0 … 10В vpm, CO₂: 0 … 5В vpm

Largest possible measuring span

Dependent on the application

Measuring range with suppressed zero point

Any zero point within 0 … 100 vol.% can be implemented; smallest possible span 20%

Operating position

Front wall, vertical

Conformity

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

Influence of interfering gases must be considered separately

Design, enclosure

Weight

Approx. 15 kg (with one IR channel)

Approx. 21 kg (with two IR channels)

Degree of protection

IP20 according to ENВ 60529

Electrical characteristics

EMC (electromagnetic compatibility)

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

Electrical safety

According to EN 61010-1, overvoltage categoryВ III

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

1-channel unit: Approx. 40 VA

2-channel unit: Approx. 70 VA

Fuse values

• 100В ...В 120 V

1 T/250 (7MB2121)
1.6 T/250 (7MB2123)

• 200В ...В 240 V

0.63 T/250 (7MB2121)
1 T/250 (7MB2123)

Gas inlet conditions

Permissible sample gas pressure

• With hoses

• Without pressure switch

600 … 1 500 hPa (absolute)

• With pressure switch

700 … 1 300 hPa (absolute)

• With pipes (without pressure switch)

600 … 1 500 hPa (absolute)

Sample gas flow

18 … 90 l/h (0.3 … 1.5 l/min)

Sample gas temperature

Min. 0 ... max. 50 В°C, but above the dew point

Sample gas humidity

< 90% RH (relative humidity), or dependent on measuring task, non-condensing

Dynamic response

Warm-up period

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

Delayed display (T₉₀-time)

Dependent on length of analyzer chamber, sample gas line and configurable damping

Damping (electrical time constant)

0 … 100 s, configurable

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

Approximately 0.5 ... 5 s, depending on version

Time for device-internal signal processing

<В 1В s

Pressure correction range

Pressure sensor

• Internal

700 … 1 200 hPa absolute

• External

700 … 1 500 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 1% of the smallest possible measuring range according to rating plate

Zero point drift

<В В±В 1% of the current measuring range/week

Measured-value drift

<В В±В 1% of the current measuring range/week

Repeatability

≤ 1% of the current measuring range

Detection limit

1% of the smallest possible measuring range

Linearity error

В±В 0.5В % of the full-scale value

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

< 1% of current measuring range/10 K (with constant receiver cell temperature)

Sample gas pressure

• With disabled pressure compensation: <В 0.15% of the span/1% change in atmospheric pressure
• With disabled pressure compensation: <В 1.5% of the span/1% change in atmospheric pressure

Sample gas flow

Negligible

Auxiliary power

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

Environmental conditions

Application-specific measuring influences possible if ambient air contains measured components or cross interference-sensitive gases

Electrical inputs and outputs

Analog output

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

Relay outputs

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

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 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 ... +70В В°C during storage and transportation,
5 ... 45В В°C during operation

Permissible humidity

< 90% RH (relative humidity) as annual average, during storage and transportation (dew point must not be undershot)