MTL5018 MTL Instruments Proximity Detector Interface

The MTL5018 enables two safe-area loads to be controlled by two
switches or proximity detectors located in a hazardous area. Two
relay outputs are provided. Independent phase reversal control allows
an alarm condition to be signalled for either state of the sensor. A
selectable line fault detect (LFD) facility detects an open or short
circuit in either field circuit.

SPECIFICATION
See also common specification
• Number of channels
Two
• 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
• Safe-area output
Two relays with changeover contacts
• Hazardous-area inputs
Inputs conforming to NAMUR/DIN 19234 standards for proximity detectors
• Voltage applied to sensor
7 to 9V from 1kΩ ±10%
• Input/output characteristics
Normal (reverse) phase:
output energised (de-energised) if Iin >2.1mA or Rin <2kΩ
output de-energised (energised) if Iin <1.2mA or Rin >10kΩ
Hysteresis: 200µA, typical
• Line fault detection (LFD)
User-selectable via switches on the top of the unit. Line faults are indicated by an LED for each channel. A detected line fault de-energises the relay.
Open-circuit alarm on if Iin<100µA
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
• Phase reversal
Independent for each channel, user-selectable
• Relay type
Single pole, 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
• LED indicators
Green: power indication
Yellow: two: status of each channel (on when outputs are energised)
Red: two: LFD indication for each channel (on when line fault detected)
• Maximum current consumption
60mA at 20V
60mA at 24V
40mA at 35V
• Maximum power dissipation
1.4W at 24V
1.5W at 35V
• Isolation
250V ac or dc between power supply, hazardous-area circuits and relay outputs
• Safety description (each channel)
10.5V, 800Ω, 14mA, Um= 250V rms or dc




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