Measurement- and control technology
- Wide range flow measurement, with dynamic range 1:50 (comparison: plate orifice 1:5!) Flow measurement without plate orifice, low backpressure
- 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: 100 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
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
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