Product Description
MTL MTL831C Analog Multiplex Transmitter
- Manufacturer: Measurement Technology Ltd (MTL), part of Eaton's Crouse-Hinds series
- Model/Part Number: MTL831C
- Description: Analog Multiplex Transmitter for Temperature and mV Inputs
Overview
- The MTL831C is an analog multiplex transmitter designed for temperature and millivolt measurements in hazardous areas, typically Zone 0, 1, or 2. It aggregates data from up to 16 thermocouple (THC), resistance temperature detector (RTD), or millivolt inputs and transmits them over a single shielded twisted-pair data highway to a safe-area receiver, such as the MTL838C. This reduces wiring costs and complexity in safety-critical applications like oil and gas, chemical, and process automation. The MTL831C is intrinsically safe and part of the MTL830C multiplexer system, which is RoHS compliant.
Technical Specifications
| Specification | Details |
|---|---|
| Model | MTL831C |
| Series | MTL830C Multiplexer System |
| Type | Analog Multiplex Transmitter |
| Input Types | Thermocouple (THC), 2/3/4-wire RTD, millivolt sources |
| Number of Inputs | Up to 16 per transmitter |
| Power Supply | Via data highway (from MTL5553 or MTL838C) |
| Data Highway | Shielded twisted-pair, up to 1 km (IS), 2 km (non-IS) |
| Terminal Options | Fixed screw (MTL831C), pluggable screw (MTL831C-PS), cage clamp (MTL831C-PC) |
| Operating Temperature | -40°C to +70°C |
| Certifications | ATEX: II 1 G Ex ia IIC T4 Ga, IECEx, FM, CSA |
| Safety Integrity Level | Suitable for SIL 3 loops (with appropriate system design) |
| Mounting | DIN rail or enclosure (e.g., FCS-9616/9632 junction box) |
| Construction | Polycarbonate case, conformally coated PCB, spot encapsulated |
Additional Information
- Functionality: The MTL831C multiplexes up to 16 sensor inputs, transmitting data and power over a single data highway, reducing wiring by up to 50% compared to traditional systems. It supports thermocouple burnout detection by periodically measuring resistance, with warnings if resistance increases by more than 50 ohms. The system is compatible with Modbus TCP via the MTL838C-MBT receiver and integrates with DCS, PLC, or PC systems.