MTL Instruments MTL5081 Thermocouple Isolator

MTL5081 Low-Level DC Signal Isolator

The MTL5081 from MTL Instruments safely isolates low-level DC signals from hazardous areas to safe area receiving instruments. This single-channel module is designed for thermocouple applications with external cold junction compensation. 

Key Technical Specifications

• Brand: MTL Instruments
• Model: MTL5081
• Product Type: Low-Level DC Signal Isolator
• Channels: One channel
• Signal Type: Any DC millivolt source
• Response Time: 150µs typical
• Frequency Response: DC to 4kHz

Hazardous Area Certification

• Signal Source Location: Zone 0, IIC, T4-T6 hazardous area
• Division Rating: Division 1, Group A hazardous location
• The MTL5081 maintains intrinsic safety for connected sensors
• It enables safe operation of millivolt sources in explosive atmospheres

Signal Specifications

• Input/Output Range: 0 to ±50mV standard operation
• Overrange Capability: ±55mV maximum
• Output Resistance: 60Ω nominal
• Transfer Accuracy: <0.05% or ±5µV (whichever greater)
• Temperature Drift: ±(2µV + 0.002% of input) per °C

Performance Characteristics

• Response Time: Settles within 150µs typical to 10% of final value
• Frequency Response: DC to 4kHz for dynamic signals
• High linearity and repeatability for precise measurements
• Stable performance across temperature variations

Terminal Configuration

• Input: Terminal 1 (THC/mV input –ve), Terminal 2 (THC/mV input +ve)
• Output: Terminal 11 (Output –ve), Terminal 12 (Output +ve)
• Power Supply: Terminal 13 (Supply –ve), Terminal 14 (Supply +ve)
• Clear terminal identification for easy installation
• Standardized layout for straightforward wiring

Power Requirements

• Supply Voltage: 20 to 35V DC operating range
• Current Consumption: 20mA maximum
• Power Dissipation: 0.5W at 24V
• Maximum Dissipation: 0.7W at 35V
• Status Indicator: Green LED for power monitoring

Isolation & Safety

• Isolation Rating: 250V AC between all circuits
• Safety Classification: Non-energy-storing apparatus
• Safety Limits: ≤1.2V, ≤0.1A, ≤20µJ and ≤25mW
• Compatibility: Can connect to any IS loop with open circuit voltage <28V
• Comprehensive protection for hazardous area operation

Frequently Asked Questions

• What signals does the MTL5081 handle?
  It processes any DC millivolt source, including thermocouples with external cold junction compensation.
• How fast is the signal response?
  It typically settles within 150 microseconds to 10% of final value.
• What safety features are included?
  Configurable safety drive for thermocouple burnout protection with upscale/downscale selection.
• What is the signal range capability?
  It handles 0 to ±50mV with overrange to ±55mV for exceptional conditions.

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