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MTL5511 SWITCH/ PROXIMITY DETECTOR INTERFACE channel, with line fault detection The MTLx511 enables a safe-area load to be controlled by a switch or proximity detector located in a hazardous-area. When selected, open or short circui
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channel, with line fault detection

See also common specification
Number of channels One Location of switches
Zone 0, IIC, T6 hazardous area
Div. 1, Group A hazardous location
Location of proximity detector
Zone 0, IIC, T4–6 hazardous area if suitably certified
Div. 1, Group A hazardous location
Inputs conforming to BS EN60947–5–6:2001 standards for
proximity detectors (NAMUR)
Voltage applied to sensor
7 to 9V dc from 1k ±10%

Input/output  characteristics
Normal phase
Outputs closed if input  > 2.1mA (< 2kΩ in input circuit)
Outputs open if input < 1.2mA (> 10kΩ in input circuit)
Hysteresis: 200µA (650Ω) nominal
Line fault detection (LFD) (when selected)
User-selectable via switches on the side of the unit. A line fault is
indicated by an LED. The channel output relay is de-energised if
an input line fault is detected.
Open-circuit alarm on if I < 50µA
Open-circuit alarm off if I > 250µA
Short-circuit alarm on if R < 100Ω
Short-circuit alarm off if R > 360Ω
Note: Resistors must be fitted when using the LFD facility with a contact input
500Ω to 1kΩ in series with switch
20kΩ to 25kΩ in parallel with switch
Safe-area output
Single pole relay with changeover contacts
Note: reactive loads must be adequately suppressed
Relay characteristics
Signal plug HAZ1-3 is required for access to this function
LED indicators
Green: power indication
Yellow: channel status, on when output energized
Red: LFD indication, on when line fault detected
Maximum current consumption
25mA at 24V
Power dissipation within unit
0.6W at 24V
These models have been assessed for use in IEC 61508 functional
safety applications. See data on MTL web site.



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