The pressurized enclosure system F 850 contains at least the control unit FS 850 and a solenoid valve. Each can be mounted in- or outside the enclosure.

Furthermore several remote controls (operation panels) are available to improve ergonomic of operation. It is also possible to connect intrinsically safe sensors to the control unit FS 850.

Properties

Compact system, mounting inside hazardous area or inside EEx p-Enclosure

Admittances

• New: Certification according to EN 60079-2: BVS 06 ATEX E 088
• Inclusive safety function test according EN 954-1, category 3;
  i.e. one fault safety

Menu guided programmable operation modes:

• Leakage compensation <=> continuous flow
• Digital solenoid valve <=> proportional solenoid valve
• Pressure indication <=> flow indication <=> remaining purging time

The first system containing a proportional working pressure and flow sensory

• No membrane switches, no screws or potentiometer to adjust pressure or flow thresholds

High availability because of regulated pressure and proportional valve

• High service reliability because of constant pressure
• No purge medium wasting, just the exact quantity to hold the pressure is needed
• Increasing leakage caused by e.g. enclosure ageing will be balanced and therefore sudden pressure failure will be prevented
• Almost no flow noise and only a small protective gas consumption using a solid enclosure

Purging with pressure regulation*

• Pressure sensitive parts of the enclosure like membrane switch panels or windows will not be overloaded
• Purge volume accuracy is achieved by integration of the purge medium flow on the outlet

Two digital solenoid valve or proportional solenoid valve- technique for continuous flow operation mode

• Prevents overload and burst danger of the EEx p- enclosure caused by disturbances at the outlet

Terminal specifications

• Two-pole potential free terminals, switching capacity
  250 VAC / 5A / 200 VA / cos j > 0,7
• Integrated intrinsically safe interface for additional safety sensory
• Valve fuse is exchangeable placed inside the control unit FS850 - no separate EEx e- fuse box required
• The build-in spark lattice allows to let off the purge medium direct into the hazardous area

Display

• On-line text messages of operation and malfunction states
• States of pressure or flow are anytime available
• Displays menu and messages as plain text
• Available languages: German, English, French, Dutch, Spanish

EEx i- operation panel BT851

• For ergonomically use and control of the EEx p- system
• The connection to the control unit counts only 3 wires

Option Pressure fail alarm

• Reports sudden pressure failure to safe area with an passive Relay contact with EEx e terminals

High operation safety

• Approved function security acc. to EN 954-1
• Alarm messages on LC-Display

Option Pressure loss alarm

• EEx e- contact (normal closed) by pressure loss, programmable pressure level