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Text version of the page
2/5
2
Automation 17.04.2008
Single-Channel Safety Barriers
with Electronic Current Limitation for Positive Polarity
with Voltage Limitation Series 9004/51
Single-channel safety barriers with electronic current for positive polarity
05866E01
• For positive potential
• Electronic current limitation
• Voltage limitation
• Grounded circuit
• Approved for installation in Division 2 and
Zone 2
Selection Table
UN Imax. Safety values Order number
Uo Io Po IIC IIB
Lo Co Lo Co
V mA V mA mW mH mF mH mF
23 ... 27 40 20.6 50 1030 – – – – 2.5 0.58 9004/51-206-050-001
23 ... 27 70 20.6 85 1751 – – – – 0.37 0.68 9004/51-206-085-001
24 ... 26 25 22 30 660 1.3 0.073 2.5 0.55 9004/51-220-030-001
Functional and Maximum Safety Values
UN Rated operating voltage Uo Maximum voltage Lo Maximum permissible
external inductance
Imax. Maximum current
through the safety barrier
Io Maximum current Co Maximum permissible
external capacity
ăU Additional voltage drop
through the safety barrier
Po Maximum power
0V
0V
UN
/ PA
Intrinsically safe
field device
Control room
equipment
Safe area Hazardous area
+Ue +Ue
-Ue / 0V
*) Maximum leakage current < 2 mA; maximum output voltage 17 V
**) Maximum leakage current < 2 mA; maximum output voltage 18 V