MTL831B MTL Instruments - Multiplexer Transmitter

MTL831B Multiplexer Transmitter for Hazardous Zone 0 Monitoring

Key Features

16-channel THC/mV (±60mV) or 15-channel RTD (2/3/4-wire) inputs

Dual redundant Modbus® data highways (loop-powered)

Mixed sensor support: Thermocouples + RTDs on one unit

Intrinsically safe for Zone 0, IIC, T4 (Group A-D hazardous areas)

No external power needed - fully data highway powered

Technical Specifications

Input Types:

• THC/mV: ±60mV max, 1kΩ potentiometer
• RTD: 2/3/4-wire Pt100, DIN 43760 compliant

Safety Ratings:

• Input circuit: 15V/16.3mA/60mW max
• Data highway: 30V/300mA/1.2W max
• Cable limits (IIC): 0.58μF, 127mH or 535μH/Ω

Performance:

• Response time: 1s per channel
• Operating temp: -20°C to +60°C
• Storage temp: -40°C to +80°C

Industrial Applications

Oil & gas wellhead temperature monitoring

Chemical reactor multi-point safety systems

Pharmaceutical batch process validation

Power plant turbine exhaust monitoring

Mining ventilation temperature networks

Why Choose This Unit?

Eliminates 16 separate transmitters - saves cost/space

Redundant comms prevent data loss in critical processes

Mixed sensor support simplifies legacy upgrades

Zero hazardous-area wiring - fully loop-powered

ATEX/IECEx certified for explosive atmospheres

Installation Notes

Mount in Zone 0 with MTL3052 barrier (sold separately)

Use shielded cables per BASEEFA capacitance limits

Max 535μH/Ω for IIC (Group A/B) installations

Verify sensor types match channel configurations

Package Includes

1x MTL831B transmitter unit

Termination guide

Modbus® protocol documentation

Order & Support

In stock - ships same day via DHL/Fedex

12-month warranty against defects

Free config support for first-time users