MTL831C Multi channel Temperature Converter

Type	Intrinsically Safe Analog Transmitter
Input Types	Thermocouples (TC), RTDs (2/3/4-wire), mV signals
Output Signal	4-20 mA or Modbus RTU/TCP (via MTL838C receiver)
Power Supply	12–42 Vdc (intrinsically safe)
Operating Temperature	-40°C to +85°C (storage: -55°C to +100°C)

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Description

MTL831C Multi channel Temperature Converter

MTL831C

The MTL831C is purpose-built to handle up to 16 analog inputs from thermocouples (TCs), resistance temperature detectors (RTDs), or millivolt (mV) sources, converting them into standardized 4-20 mA signals or Modbus RTU/TCP outputs for integration with PLCs, DCS, or SCADA systems. Its single-slot DIN rail design allows flexible installation in hazardous areas (Zone 0/1) or safe zones, while a dedicated data highway—comprising a single shielded twisted-pair cable—enables reliable signal and power transmission over distances up to 2 km. This architecture reduces wiring complexity by 50% compared to traditional point-to-point solutions, optimizing installation costs and cabinet space. By combining intrinsic safety certification (ATEX, IECEx, FM) with a wide operating temperature range (-40°C to +85°C), the MTL831C delivers uncompromising performance in extreme conditions, from offshore platforms to desert refineries.

Label	Specification
Model Number	MTL831C
Brand	Eaton (MTL Instruments)
Type	Intrinsically Safe Analog Transmitter
Input Types	Thermocouples (TC), RTDs (2/3/4-wire), mV signals
Output Signal	4-20 mA or Modbus RTU/TCP (via MTL838C receiver)
Power Supply	12–42 Vdc (intrinsically safe)
Operating Temperature	-40°C to +85°C (storage: -55°C to +100°C)
Communication Protocols	Modbus RTU, Modbus TCP, Profibus, HART (via configuration)
Certifications	ATEX, IECEx, FM (Class I, Div 1, Groups B, C, D)
Mounting	35mm DIN rail (IP20 enclosure; IP67 with optional ENC8 housing)
Dimensions	263mm (L) × 58mm (W) × 28mm (D) (10.35” × 2.28” × 1.10”)
Weight	2 kg (4.41 lbs)
Data Highway Range	Up to 2 km (shielded twisted-pair cable)
Redundancy Support	Compatible with dual MTL838C receivers for fail-safe configurations

MTL831C

The MTL831C redefines hazardous area signal transmission through its blend of safety, flexibility, and performance. Its intrinsic safety design ensures no spark or thermal energy is released in explosive environments, while advanced surge protection (via optional MTL MSA devices) safeguards against lightning strikes and voltage transients. The module supports configurable input types, allowing seamless integration with legacy sensors: RTDs can be set to 2/3/4-wire modes via Modbus or PC software, while TC inputs auto-detect thermocouple types (e.g., J, K, T) to eliminate manual configuration errors.

MTL831C

Compatible and Related Models

MTL838C: A Modbus RTU receiver that translates signals from the MTL831C into RS485 outputs for PLC/DCS integration, offering redundant serial ports for high-availability systems.
MTL838C-MBT: A Modbus TCP receiver with Ethernet connectivity, ideal for cloud-based industrial IoT (IIoT) applications requiring real-time data analytics.
MTL5553/MTL5053: Intrinsically safe isolators/power supplies that protect the data highway when the MTL831C is installed in hazardous areas.
MTL831C-PS: A variant with pluggable screw terminals for quick field replacement, reducing downtime during maintenance.
MTL9485: A surge protection module that complements the MTL831C in lightning-prone regions, ensuring signal integrity during electrical storms.