7MB2421-.....-....

General information

Measuring ranges

4, internally and externally switchable; manual and autoranging possible

Smallest possible measuring span

0 ... 10 vpm

Largest possible measuring span

99.999 vpm*⁾

Concentration units

ppm, C₁, C₃, C₆ or mgC/m³

Autoranging

Hysteresis, selectable

Measured-value display

Digital concentration display (5 digits with floating point)

Resolution of digital display

0.1 % of measured value

Operating position

Front wall, vertical

Conformity

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

Oven temperature

Adjustable, 100 ... 200 °C

Design, enclosure

Degree of protection

IP20 according to EN 60529

Weight

Approx. 23 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. 150 VA during operation,
• approx. 350 VA during warm-up phase

EMC (ElectromagneticCompatibility)

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

Electrical safety

In accordance with EN 61010-1, overvoltage category II

Fuse values

• 100 ... 120 V: 4.0T/250
• 200 ... 240 V: 2.5 T/250

Gas inlet conditions

Permissible sample gas pressure

• Without pump

< 2 000 hPa abs.

• With integrated pump

600 ... 1 100 hPa

Sample gas flow

18 ... 60 l/h (0.3 ... 1 l/min)

Sample gas temperature

0 ... 200 °C

Sample gas humidity

< 90% RH (RH: relative humidity)

Dynamic response

Warm-up period

At room temperature, approx. 2 ... 3 h

Delayed display (T₉₀)

2 ... 3 s

Damping (electrical time constant)

0 ... 100 s, parameterizable

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

With filter, 2 ... 3 s

Time for device-internal signal processing

< 1 s

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 measuring span according to rating plate

Measured-value drift

< 1%/week of the current measuring range

Repeatability

< 1% of the current measuring range

Detection limit

0.1 ppm (version for ultra-pure gas measurement: 50 ppb)

Linearity error

< 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

< 1%/10 K referred to smallest possible span according to rating plate

Atmospheric pressure

< 1%/50 hPa

Sample gas pressure

< 2% of the current measuring range range/1% pressure change (within 600 ... 1 100 hPa)

Power supply

< 1% of the current measuring range with rated voltage ± 10%

Position influence

< 1 % with < 15° inclination

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, potential-free

Analog inputs

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

Binary inputs

6, designed for 24 V, floating, 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

5 ... 45 °C during operation,

-30 ... +70 °C during storage and transportation

Permissible humidity

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

Gases

Operating pressure

Inlet pressure

Pump startup

Flow through FID

Flow through bypass

Without

With

hPa (abs.)

hPa (abs.)

hPa (abs.)

ml/min

ml/min

Combustion gas

3 000 ... 5 000

2 000 ± 20

~ 25

—

Combustion air

3 000 ... 5 000

1 420 ± 20

1 500

~ 320

~ 500

Sample gas

~ 1000

—

1 500 ± 2

~ 3

~ 1 000

Zero gas

3 500 ... 4 000

—

1 500 ± 2

~ 3

~ 1 000

Calibration gas

3 500 ... 4 000

—

1 500 ± 2

~ 3

~ 1 000

Gases

Operating pressure

Inlet pressure

Sample/calibration gas

Flow through FID

Flow through bypass

Without

With

hPa (abs.)

hPa (abs.)

hPa (abs.)

ml/min

ml/min

Combustion gas

3 000 ... 5 000

2 000 ± 20

~ 25

—

Combustion air

3 000 ... 5 000

1 480 ± 5

—

~ 320

~ 300

Sample gas

1 500 ... 2 000

—

1 500 ± 2

~ 3

~ 500

Zero gas

1 500 ... 2 000

—

1 500 ± 2

~ 3

~ 500

Calibration gas

1 500 ... 2 000

—

1 500 ± 2

~ 3

~ 500