7MB8000-4AA

General information

Based on DINВ ENВ 61207/IECВ 1207. All data based on digital gas mixture H₂ in N₂

Measuring ranges

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

Largest possible measuring span

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

Measuring ranges with suppressed zero point

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

Operating position

Front wall, vertical

Conformity

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

Design, enclosure

Degree of protection

IP65 according to ENВ 60529

Weight

Approx. 25 kg

Electrical characteristics

EMC interference immunity (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 ENВ 61010-1; overvoltage category II

Auxiliary power (see nameplate)

100В VВ AC -10%В ...В 120В VВ AC +10%,
48В ...В 63В Hz

or

200В VВ AC -10%В ...В 240В VВ AC +10%,
48В ...В 63В Hz

Power consumption (unit)

Approx. 20 VA

Fuse values

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

Gas inlet conditions

Sample gas pressure

800В to 1В 100 hPa (absolute)

Sample gas flow

30В to 90 l/h (0.5В to 1.5В l/min)

Sample gas temperature

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

Temperature of the measuring cell

Approx. 60В ВєC

Sample gas humidity

< 90% relative humidity

Purging gas pressure

• Permanent

165В hPa above ambient pressure

• For short periods

Max. 250В hPa above ambient pressure

Time response

Based on sample gas pressure 1В 000В hPa absolute, 0.5 l/min sample gas flow and 25В В°C ambient temperature

Warm-up period

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

Delayed display (T₉₀)

<В 5В s

Electrical damping

0В ...В 100В s, configurable

Dead time (at 1 l/min)

Approx. 0.5В s

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 (maximum accuracy achieved after 2 hours)

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

Zero point drift

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

Measured-value drift

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

Repeatability

<В 1% of the current measuring range

Detection limit

1% of the current measuring range

Linearity error

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

Influencing variables

Based on sample gas pressure 1013В hPa absolute, 0.5 l/min sample gas flow and 25В В°C ambient temperature

Ambient temperature

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

Accompanying gases

Deviation from zero point (for influence of interfering gas, see section "Cross-interference")

Sample gas flow

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

Sample gas pressure

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

Electrical inputs and outputs

Analog output

0/2/4В ...В 20В mA, floating;
load max.В 750В О©

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 correction of cross-interference

Digital inputs

6, designed for 24В 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

-30В ...В +70 В°C during storage and transportation, 5В ...В 45В В°C in operation

Permissible humidity (dew point must not be fallen below)

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