The MTL831B is an analog multiplexing transmitter manufactured by Eaton that is capable of transmitting input signals from multiple hazardous areas to safe areas via a single twisted pair data highway. This product is of interest in industrial applications due to its inherent safety features, especially where equipment needs to be installed in hazardous areas such as Zone 0 or Zone 1.

The MTL831B is capable of monitoring up to 16 inputs from thermocouples or millivolt sources, or up to 15 2 -, 3 -, or 4-wire thermal resistance inputs. It offers two data highway outputs that can transmit signals and power over distances of up to 3 km, depending on the application scenario, cable type and level of environmental interference. The data highway can use a simple twisted pair or a wire pair inside an IS multi-core cable.

In terms of installation, the MTL831B can be installed in safe or hazardous zones, including zone 0 or Zone 1, depending on the application requirements. It supports DIN rail mounting or flat pair mounting, and Eaton offers a range of enclosures such as ENC8, ENC8-SS, ENC83 or ENC83-SS to provide suitable IP67 protection levels if the transmitter is located in an exposed area.

MTL831B

In addition, special care needs to be taken at the time of installation of the MTL831B that all installation, operation and maintenance work must be carried out by trained and qualified personnel who are familiar with the various protection types, installation practices, relevant rules and regulations, and the general principles of area classification. Regular review training should also be conducted when appropriate.

The use of the MTL831B is not limited to a single application, it can be used in conjunction with the MTL838B-MBF receiver, which converts the information transmitted by the MTL831B into a Modbus® serial data output and provides input and status information. If the MTL831B transmitter is installed in a hazardous area, each data highway must be protected by an MTL3052 digital isolator installed in a safe area.

Overall, the MTL831B is a versatile, high-security industrial device suitable for a variety of industrial monitoring and control applications, especially where intrinsic safety features are required.