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Additional Equipment Manual EEx p E-7
Order No.:
A5E 000 58873-02
2.6 Differential pressure monitoring (only for analyzer versions EEx p
"Compensation of losses resulting from leaks"
)
The sample gas pressure must be supplied fail-safe to the analyzer (within the specified limits, see
Section 2.3). If only an operationally safe supply is available, an additional differential pressure switch
must be provided (see also point 5 in "Special conditions" of the EC-type examination certificate).
If flame inhibitors are specified, differential pressure switches and/or relative pressure sensors must be
connected via a T-piece between the sample gas inlet couplings and the flame inhibitors (see
Sections 3 "Assembly" and 3.2 "Assembly diagram for the versions EEx p with "Compensation of
losses resulting from leaks").
Accessories required for differential pressure monitoring:
- Differential pressure switches
-For non-corrosive sample gases:
Order No.: 7MB8000-5AB
Materials wetted by sample gas: NBR (buna N), aluminum
Switching point: Adjustable between 0 and 20 hPa
-For corrosive sample gases:
Order No.: 7MB8000-5AA
Material wetted by sample gas: 1.4571
Switching point: Adjustable between -20 and +20 hPa
2.7 Accessories (applies to all analyzer versions)
- Flame inhibitor Order No. 7MB8000-2BA
Material: 1.4571 (special materials on request)
The design of parts wetted by the sample gas must meet the application requirements and should be
selected accordingly.
- Isolating relay
Order No.: 7MB8000-4AB
Coil power supply: 110 V AC
Contacts: 8 NO contacts
Order No.: 7MB8000-4AA
Coil power supply: 240 V AC
Contacts: 8 NO contacts
- Isolating transformer
Order No.: 7MB8000-3AA
Output signal (safety): 15.8 V / 60 mA
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