MTL5511 MTL Instruments Switch Proximity Detector Interface 10ms Maximum

The MTL5511 enables a safe-area load to be controlled by a switch or proximity detector located in a hazardous-area. When selected, open or short circuit conditions in the field wiring are detected by the line-fault-detect (LFD) facility and also indicated on the top of the module. Phase reversal for the channel is selected by a switch on the side of the module and output is provided by changeover relay contacts

• 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

• Hazardous-area inputs

  Inputs conforming to BS EN60947–5–6:2001 standards for

• proximity detectors (NAMUR)

  Voltage applied to sensor

  7 to 9V dc from 1kΩ ±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 Iin < 50μA

  Open-circuit alarm off if Iin > 250μA

  Short-circuit alarm on if Rin < 100Ω

  Short-circuit alarm off if Rin > 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

  Response time: 10ms maximum

  Contact rating: 250V ac, 2A, cosØ >0.7

  40V dc, 2A, resistive load