MTL5514 MTL Switch/Proximity Detector Interface Response time 10ms maximum

The MTLx514 enables a safe–area load to be controlled, through a relay, by a proximity detector or switch located in a hazardous area. Line faults
are signalled through a separate relay and indicated on the top of the module. Switches are provided to select phase reversal and to enable the line fault detection

• Number of channels

  One

• Location of switch

  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. Line faults

  are indicated by an LED. Line fault relay is energised and channel

  output relay de-energised if input line-fault 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

  Channel: Single pole relay with changeover contacts

  LFD: Single pole relay with changeover contacts

  Note: reactive loads must be adequately suppressed