Gonnheimer Elektronic F870S, User Manual

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F870S 2 Pressurized enclosure system F870S Page 11
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2.5 Peripherals
2.5.1 Ex i- external sensory: ES872
The intrinsically safe bus interface is used to transmit measurement values from the exter-
nal proportional sensor module ES872 to the control unit. This allows the integration of ad-
ditional safety control features into the purge control system.
This interface is also suitable for e.g. temperature or other sensors.
2.5.2 Configuration module: CM873
Using the same Ex i- bus, the customer can connect the optional configuration module
CM873 to load application specific configuration data and parameters into the control unit
without further manual programming.
The handling is quite simple: plug this CM873 into the intended port and restart the control
device.
2.5.3 Operating panels
For the control unit FS870S several operating and visualizing panels are available. These
panels consist of the explosion protection class 'intrinsically safe' and are considerably ad-
vantageous, particularly when the control unit is mounted inside the enclosure.
2.5.4 Common operating panels: BT 854.1 and BT 855.1
•
On/Off-Switch
•
Key-operated switch for bypass
•
LED-indicator for READY and ON
The connection to the control unit consists of 6 wires.
2.5.5 Intelligent operating panel type BT871
This operation panel indicates operation and malfunction reports as plain text. The 5 mem-
brane switches offer total command of the control unit. Status, actual pressure, flow rate as
well as remaining purge time are always available.
The connection to the control unit consists of only 4 wires.
Signal lamps on BT871
The BT871 has three colored signal lights (LED). These report system states and warnings.
2.5.6 Disconnector unit SR852 and power relay SR853
According to EN 60079-2 all non- intrinsically safe connections of the ignition capable appa-
ratus must be disconnect, if the protection gas pressure falls below the safety limit. In many
applications more than the two connector terminals on the control unit FS870S are needed.
In these cases the disconnector unit SR852, with 8 respectively 16 galvanically separated
connectors, is considerable helpful.
The power relay S853 provides 4 lines with switching power of 250V, 16 A.