With the MTL5501-SR, a fail-safe switch/proximity detector located in the hazardous area can control an isolated fail-safe electronic output. The MTLx501-SR also provides relay alarm contacts to signal line-fault conditions. The MTLx501-SR is for use with approved fail-safe sensors in loops that require operation up to SIL3 according to the functional safety standard IEC 61508.

Technical Data

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 location

Div 1, Group A, hazardous location

Line fault detection (LFD)

LFD relay output: contacts open when line fault detected

Switch characteristics: 0.3A 110V ac/dc; 1A 35V dc; 30W/33VA

LED indicators

Green: power indication

Yellow: channel status, on when fail-safe output energised

Red: LFD indication, flashing when line fault detected

SIL capable

Highest level in single in-line subsystem - SIL3 (in accordance with IEC61508-2)

MTL5501-SR