7MB2521-.....-....

General (based on EN 61207/IEC 1207. All data refers to the binary mixture H₂ in N₂)

Measuring ranges

4, internally and externally switchable; automatic measuring range switchover also possible

Largest possible measuring span

100 vol.% H₂ (for smallest measuring span, see "Function")

Measuring ranges with suppressed zero point

Any zero point within 0 ... 100 vol.% can be implemented, smallest possible measuring span: 5 % H₂

Operating position

Front wall, vertical

Conformity

CE mark in accordance with EN 61326/A1 and EN 61010/1

Design, enclosure

Degree of protection

IP20 according to EN 60529

Weight

Approx. 10 kg

Electrical characteristics

EMC (Electromagnetic Compatibility) (All signal lines must be shielded. Measured value deviations of up to 4 % of the smallest measuring range may occur in ranges with strong electromagnetic interference.)

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

Electrical safety

In accordance with EN 61010-1; overvoltage category II

Auxiliary power (see nameplate)

100 V -10% ... 120 V +10% AC, 48 ... 63 Hz or 200 V -10% ... 240 V +10% AC, 48 ... 63 Hz

Power consumption

Approx. 20 VA

Fuse values

100 ... 120 V: 1.0T/250
200 ... 240 V: 0.63 T/250

Gas inlet conditions

Sample gas pressure

800 ... 1 100 hPa (absolute)

Sample gas flow

30 ... 90 l/h (0.5 ... 1.5 l/min)

Sample gas temperature

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

Temperature of the measuring cell

Approx. 60 ?C

Sample gas humidity

< 90% relative humidity

Dynamic response

Warm-up period

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

Delayed display (T₉₀)

< 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

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 (? = 0.25%)

Zero point drift

< ± 1 %/week of the smallest possible measuring span according to rating plate

Measured-value drift

< ± 1 %/week of the smallest possible measuring span according to rating plate

Repeatability

< 1 % of the current measuring range

Detection limit

1 % of the current measuring range

Linearity error

< ± 1 % of the current measuring range

Influencing variable (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 measuring span according to rating plate

Accompanying gases

Deviation from zero point (for influence of interfering gas see paragraph titled "Interference influences")

Sample gas flow

< 0.2 % of the smallest possible span according to rating plate with a change in flow of 0.1 l/min within the permissible flow range

Sample gas pressure

< 1 % of the current measuring range with a pressure change of 100 hPa

Auxiliary power

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

Electrical inputs and outputs

Analog output

0/2/4 ... 20 mA, isolated;
load max. 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 correction of cross-interference

Binary inputs

6, designed for 24 V, isolated, freely parameterizable, e.g. for measurement 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 (dew point must not be fallen below)

< 90% relative humidity as annual average, during storage and transportation