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Text version of the page
2/14
2
Automation 17.04.2008
Dual-Channel Safety Barriers
Safety Barrier Polarity: + / Signal Barrier Polarity: +
Series 9002/33
Dual-channel safety barrier
Safety barrier polarity: + / signal barrier polarity: +
05829E02
• Diode return barrier for DC current
return signals
with very small entity current (Io) addition
• Suitable for dry contact and floating
4/20 mA signal returns
• Both channels are positive polarity.
• Approved for installation in Division 2
and Zone 2
Selection Table
Channel UN Imax. ÄU Safety-specific data Order number
Uo Io IIC IIB
Lo Co Lo Co
V mA V V mA mH mF mH mF
12
1+2
25.5
25.5
- -
60
60
3.5*)
3.5*)
28
28
28
000
1000
1000
1000
0.083
0.083
0.083
1000
1000
1000
0.65
0.65
0.65
9002/33-280-000-001
Functional and Maximum Safety Values
UN Rated operating voltage Uo Maximum voltage Co Maximum permissible
external capacity
Imax. Maximum current
through the safety barrier
Io Maximum current
ãU Additional voltage drop
through the safety barrier
Lo Maximum permissible
external inductance
+ve +ve
+ve
0V
+ve
UN
/ PA
Intrinsically safe
field device(s)
Control room
equipment
Safe area Hazardous area
*) 2,5 V to 20 mA