ENGLISH
Pag. 26
5.2 Earth ground connection
The enclosure can be connected to the earth ground through the external clamp with an-
ti-loosening locking washer and anti-rotation mechanical device.
To allow external earth ground connection, use a conductor with a minimum section of 4
mm2.
To allow internal earth ground connection, use a conductor with a minimum section of 1.5
mm2.
5.3 Cable entry
The cable entry accessories and holes’ closure must have Ex d/Ex tb protection mode and
they must be certified following ATEX 2014/34/EU directive.
Pipe ducts must comply with EN /IEC 60079-14 standard.
Thread type is described in the label (standard NPT ¾”).
In case of tapered thread, use a thread-lock glue (Loctite 243 for example) on 2-3 threads.
5.4 Main board layout
Figure 1) Detector circuit layout without HART module
Display board connection
(Only for SMART S-SS model)
JP10
LED DL3 (Red)
External Watch-Dog status:
- Normal operation mode: LED Off
- Failure: LED on
LED DL1 (red)
RS485 TX-Data monitoring:
It lits when the detector is sending data to the Rs485 line
DL1
DL2
DL3
JP1
4
5
6
Power supply: Vcc-
Power supply: Vcc+
RS485:
A
RS485: B
4-20 mA
output
JP3
JP3: RS485 end of line resistor
Closed: 120 ohm resistor connected
Open: 120 ohm resistor not connected
JP6
JP5
Sensor head connection
JP6:
Relay board or calibration keypad connection
1
2
3
LED DL2 (green).
- WARM-UP:
Flashing 750mS ON ; 250mS OFF
- NORMAL MODE:
Flashing 1 sec ON ; 1 sec OFF.
indicates the detector's working condition
Summary of Contents for SMART S-IS
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