MTL4013 MTL Two-Channel Switch/Proximity Repeater 5kHz
Introduction:
Two-channel intrinsic safety repeater. Converts hazardous area switch signals to safe-area outputs. 5kHz max frequency. LED status indicators.
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Product Overview
The MTL4013 is a two-channel intrinsic safety repeater. This unit controls safe-area loads through solid-state outputs. Switches or proximity detectors in hazardous areas trigger the outputs. The MTL4013 also works with positive displacement flowmeters. Some turbine meters are compatible as well. Power and switch status appear on top-mounted LEDs.
Technical Specifications
This section details the core parameters of the MTL4013.
Channel and Location Ratings
Number of Channels: Two channels
Switch Location: Zone 0, IIC, T6 hazardous area
Switch Location (NEC): Div.1, Group A hazardous location
Proximity Detector Location: Zone 0, IIC, T4–6 (if suitably certified)
Proximity Location (NEC): Div.1, Group A hazardous location
Input/Output Characteristics
The MTL4013 follows NAMUR and DIN 19234 standards.
Sensor Voltage: 7.0V to 9.0V dc from 1kΩ
Output ON Threshold: >2.1mA (sensor circuit <2kΩ)
Output OFF Threshold: <1.2mA (sensor circuit >10kΩ)
Hysteresis: 200µA nominal (650Ω)
Earth Fault Detection
The MTL4013 offers optional earth fault protection.
Activation: Connect terminals 3 and 6 to an MTL4220
Fault Behavior: Unit continues normal operation
Isolation Requirement: Use separate MTL4220 units for channel isolation
Output Characteristics
Operating Frequency: dc to 5kHz
Maximum Off-State Voltage: 35V
Maximum Off-State Leakage Current: 10µA
Maximum On-State Current: 50mA
On-State Voltage Drop: 1 + (0.1 x current in mA) Volts
Inductive Protection: Zener-diode protected on each output
LED Indicators
Amber LEDs: One per channel, ON when output circuit closes
Green LED: One for power indication
Power Requirements
Current at 24V dc: 47.5mA
Current at 20V dc: 45mA
Current at 35V dc: 50mA
Power Dissipation at 24V: 1.15W
Power Dissipation at 35V: 1.75W
Isolation and Safety Parameters
Isolation Voltage: 250V ac between safe and hazardous areas
Safety Description (per channel): 10.5V, 800Ω, 14mA
FM Entity Parameters (Voc/Isc): 10.5V dc, 14mA
Capacitance (Ca): 2.4µF
Inductance (La): 165mH
Terminal Assignments
| Terminal | Function |
|---|---|
| 1 | Input 1 negative |
| 2 | Input 1 positive |
| 3 | Optional link to MTL4220 from input 1 |
| 4 | Input 2 negative |
| 5 | Input 2 positive |
| 6 | Optional link to MTL4220 from input 2 |
| 7 | Output 1 positive |
| 8 | Outputs 1 and 2 negative (common) |
| 9 | Output 2 positive |
| 13 | Supply negative |
| 14 | Supply positive |
Installation Guide
Follow these steps to install the MTL4013 correctly.
Power Down: Disconnect the 24V dc supply before installation.
DIN Rail Mounting: Clip the unit onto standard 35mm DIN rail.
Hazardous Area Wiring: Connect sensors to terminals 1-2 and 4-5.
Safe Area Wiring: Connect loads to terminals 7-8 and 8-9.
Earth Fault Option: Wire terminals 3 and 6 to MTL4220 if needed.
Power Connection: Apply 20-35V dc to terminals 13 and 14.
The MTL4013 requires no external programming. Each channel operates independently. Verify proper grounding before applying power.
Package List
The package includes the following physical items.
MTL4013 two-channel repeater module (1 piece)
Product label with safety certifications
Top-mounted LED indicator cover (installed)
Note: Terminal blocks are integrated into the module body. No separate termination assembly is required.
Frequently Asked Questions (FAQ)
1. What types of sensors work with the MTL4013?
The MTL4013 works with NAMUR proximity detectors and mechanical switches. It also accepts signals from positive displacement flowmeters and some turbine meters. The sensor circuit must draw between 1.2mA and 2.1mA for proper switching.
2. Can I use the MTL4013 with a 3-wire proximity sensor?
No, the MTL4013 is designed for 2-wire NAMUR sensors only. Three-wire DC sensors require a different MTL product like the MTL4071. Using an incompatible sensor may damage the input circuit.
3. How do I enable earth fault detection on the MTL4013?
Connect terminals 3 and 6 on the MTL4013 to an MTL4220 earth leakage detector. This optional feature detects faults on either input line. The unit continues working normally when a fault occurs.
4. What is the maximum switching frequency of the MTL4013?
The MTL4013 operates from DC up to 5kHz. This makes it suitable for high-speed counting applications. Examples include turbine meters and flowmeter pulse counting. Do not exceed 5kHz or output response will degrade.
5. Why does my output stay on even with no sensor connected?
An open input circuit on the MTL4013 draws less than 1.2mA. This meets the OFF threshold condition. Check for wiring shorts or incorrect sensor wiring. A stuck output may also indicate a damaged input channel.
Related Accessories
Enhance your safety system with these compatible parts.
Earth Leakage Detector: MTL4220 for earth fault monitoring
DIN Rail Power Supply: MTL PS024 for clean 24V dc power
Label Kit: MTL4013-LBL for channel identification
Mounting Clip: MTL-CLIP for secure rail attachment
Always use genuine MTL components. Third-party accessories may affect MTL4013 safety certifications.