MTL Instruments | MTL5018 Dual Channel Controller

MTL5018 Dual Channel Relay Interface

The MTL5018 from MTL Instruments provides dual-channel control of safe-area loads from hazardous area switches and proximity detectors. This advanced interface features two independent relay outputs with comprehensive safety features including line fault detection and phase reversal control for each channel.

Key Technical Specifications

• Brand: MTL Instruments
• Model: MTL5018
• Product Type: Dual Channel Relay Interface
• Channels: Two independent channels
• Outputs: Two changeover relays
• Response Time: 10ms maximum
• Input Standard: NAMUR/DIN 19234

Hazardous Area Certification

• Switch Location: Zone 0, IIC, T6 hazardous area
• Detector Location: Zone 0, IIC, T4-T6 with certification
• Division Rating: Division 1, Group A hazardous location
• The MTL5018 maintains intrinsic safety for both channels

Input Specifications

• Sensor Voltage: 7 to 9V from 1kΩ ±10% source per channel
• Normal Phase: Output energizes if Iin >2.1mA or Rin <2kΩ
• Reverse Phase: Output de-energizes under same conditions
• Hysteresis: 200µA typical per channel for stable switching
• Phase Reversal: Independent for each channel, user-selectable

Relay Output Characteristics

• Relay Type: Two single-pole changeover contacts
• Contact Rating AC: 250V AC, 2A, cosø >0.7
• Contact Rating DC: 40V DC, 2A, resistive load
• Response Time: 10ms maximum per channel
• Note: Reactive loads require adequate suppression

Line Fault Detection (LFD)

• LFD Mode: User-selectable via top switches for each channel
• Open-circuit Alarm: On if Iin <100µA, Off if Iin >250µA
• Short-circuit Alarm: On if Rin <100Ω, Off if Rin >360Ω
• Fault Response: Detected line fault de-energizes the relay
• Contact Input: Requires 500Ω-1kΩ series and 20kΩ-25kΩ parallel resistors

Terminal Configuration

• Channel 1 Input: Terminal 1 (Input –ve), Terminal 2 (Input +ve)
• Channel 2 Input: Terminal 4 (Input –ve), Terminal 5 (Input +ve)
• Earth Leakage: Terminal 3 (Ch 1), Terminal 6 (Ch 2) for detection
• Channel 1 Output: Terminal 10 (NC), 11 (Common), 12 (NO)
• Channel 2 Output: Terminal 7 (NC), 8 (Common), 9 (NO)
• Power Supply: Terminal 13 (Supply –ve), Terminal 14 (Supply +ve)

Power Requirements

• Current Consumption: 60mA at 24V maximum
• Power Dissipation: 1.4W at 24V maximum
• Maximum Dissipation: 1.5W at 35V
• Isolation: 250V AC or DC between all circuits

Safety Parameters

• Safety Voltage: 10.5V maximum per channel
• Internal Resistance: 800Ω per channel
• Safety Current: 14mA maximum per channel
• Maximum Voltage: Um = 250V rms or DC

Frequently Asked Questions

• How many loads can the MTL5018 control?
  It can control two independent safe-area loads from two hazardous area inputs.
• Are the channels independently configurable?
  Yes, each channel has independent phase reversal and line fault detection.
• How does line fault detection work?
  It detects open circuits (<100µA) and short circuits (<100Ω) with individual channel indication.
• What is the relay response time?
  The relays respond within 10ms maximum for each channel.

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