The new reference class
Gönnheimer
Elektronic GmbH

Pressurized enclosure system

F870S

Suitable for hazardous areas Zone 1 and 21
Extended measurement and control
BVS 10 ATEX E 112, IECEx BVS 10.0095
SIL 2 - safety standard

Properties
Compact system, mounting inside
hazardous area or inside
Ex p- enclosure
Ex- protection
• Ex px control unit for use in hazardous area Zone 1
and 21, Device group II 2 G/D
• ATEX certificate: BVS 10 ATEX E 112 according to
EN 60079 and EN 61241
• IECEx certificate: IECEx BVS 10.0095 according to
IEC 60079 and IEC 61241

Measurement- and control technology
• Wide range flow measurement, with dynamic range
1:50 (comparison: plate orifice 1:5!)
• Flow measurement without plate orifice, low back
pressure
• Further lowering of back pressure by active proportional outlet valve
• Simultaneous PID- control of cabinet pressure and flow
rate (patented)
• No increased pressure inside Ex p cabinet while pre
purging phase - constant low pressure level while
purge and operating phase protects the Ex p- cabinet

Flexibility
• Wide range power supply: 110 V – 240 VAC or 24VDC
• Same solenoid valve type for all supply voltages
• Compact system – no external pressure- / flow sensors
or vents necessary
• Reduced type variety by elimination of plate orifice and
wide range power supply
• Simultaneous input and output sided PID control offers
wide ranging, free programmable cabinet pressure levels and flow rates

User-friendly operation
•
•
•
•
•

Graphic display with backlight
Single button programming and operation
Simple, menu-based programming
Clear text messaging in selectable language
Simultaneous indication of multiple system information
and measurements
• Internal log file (e.g. for system diagnosis)
• Optional, external operator panel BT871 with graphic
display and backlight

High safety standard
• Functional safety SIL 2 according to IEC 61508
• Performance level “d” according to DIN EN ISO 13849

Interfaces
• Ethernet interface (Ex e) for connection to supervisory
control system - Web interface (integrated web server)
for process monitoring via WWW (option)
• Ex i- interface for intelligent operator panel BT871
• Ex i- bus interface for external proportional pressure
sensor ES872
• Ex i- bus interface for customer specific data module
CM873
• Discrete Ex i- I/Os (BYPASS, ON/OFF, LED output for
„System OK“, "System-ON", etc.)
• External Ex i- alarm input for safety loops
• Programmable, potential free alarm contact output
• Design compatible to established system F850S

Applications
• Analyzer instruments with special requirements within
the operation mode "continuous flow" (flow rate control
and monitoring)
• Applications with high purge flow rate at low cabinet
pressure