Description
MTL4081: Millivolt and Thermocouple Isolator
The MTL4081 safely isolates low-level signals from hazardous areas. It works with strain-gauge bridges and thermocouples. This module features safety drive options for cable breakage and thermocouple burnout. Perfect for precise measurement in explosive atmospheres.
Technical Specifications
Brand: MTL
Model: 4081
Input Signal: 0 to ±50mV (±55mV overrange)
Output Resistance: 60Ω nominal
Accuracy: <0.05% or ±5μV (whichever greater)
Temperature Drift: <2μV/°C maximum
Response Time: 150μs to within 10%
Frequency Response: DC to 4kHz
Power Consumption: 26mA max (20-35V DC)
Power Dissipation: 0.6W at 24V
Isolation: 250V AC between areas
Hazardous Rating: Zone 0, IIC, T4-T6 / Div 1, Group A
Safety Parameters: Umax=1.0V, Imax=47.8mA, Pmax=0.012W
LED Indicator: Green power light
Operating Temperature: -20°C to +60°C
Storage Temperature: -40°C to +85°C
Termination: Screw terminals
Mounting: DIN rail compatible
Humidity Range: 0-95% non-condensing
Signal Source: Any DC millivolt source
Applications: Strain-gauge bridges, thermocouples with external CJC
Frequently Asked Questions
What signals does it work with?
It accepts any DC millivolt signal from 0 to ±50mV with ±55mV overrange.
How does the safety drive work?
Two top switches let you enable/disable safety drive and choose upscale or downscale operation on fault.
What is the response time?
Very fast – settles within 150 microseconds to within 10% of final value.
Can it work with thermocouples?
Yes, but requires external cold-junction compensation as it doesn’t have built-in CJC.
What is the frequency response?
DC to 4kHz, making it suitable for dynamic measurements and fast-changing signals.
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