SIL2- Transmitter Power Supply with 2 Outputs MSK 200I-TV2

To achieve a maximum safety in production processes, new innovative technologies have to guarantee safety of these processes, in order to note and indicate any disruptions from optimal conditions as soon as possible. With the DuoTec-Failsafe technology developed by Mütec Instruments, these criteria are met by means of self-monitoring security. Additionally measuring accuracy and reliability is increased and lifetime cost of instruments reduced. DuoTec-Failsafe is the only interface worldwide with self-monitoring and has achieved DIN 19250 TÜV-certification according to AK4 and certification according IEC 61508 SIL2.

Application

DuoTec-systems consist of the transmitter (MTP200) and the 2-wire-power-supply unit (MSK200). They are the interface between the system (sensors in the field) and the PCS or PLC. The system accepts practically all electrical standard signals (mA, mV, V) and temperature sensors (Pt100, TC). Hazardous area protection to EExia (area 0) is available. Two wire transmitter are supplied directly by the supply unit to EExib (area 1) or EExia (area 0). The systems itself are not installed in an ex-area. Output signals such as 4-20mA or 0-10VDC, 4 limit values and a maintenance accessory relay are available. All information’s are available by serial Interface (RS 232/RS 485).

The measuring transmitter and the measuring transmitter power supply system include limit switches, thus an separate limit switch card is not necessary.

Safety due to request of IEC 61508 SIL2

In addition to standard applications the devices are suitable for fail-safe installations. Fail-safe installations are designed to
minimize risk of damage and harm to equipment and personnal by maintaining a safely operation in case of emergency or
even controlled shut-down of production line.

Continuous self monitoring

The principle design in the DuoTec systems consist of two (2) independent microprocessors. These microprocessors continuously monitor themselves and all involved functions while processing measurements. These functions include the measurement circuit, output circuit, power supply circuit, relay contacts, microprocessor hardware, and software. Within 100ms a total of 10 single diagnostic functions are initiated. If any of the diagnostic functions don’t pass a plausibility algorithm a service alarm is generated. In any event, a open contact (closed-circuit current) is available for either a safety loop or group alarm. A front-sided red LED visually indicates an alarm directly at the transmitter and is displayed on a connected monitor via our WINSMART software. In case of an intermittent alarm, for instance a loose cable connection, this error is protocoled in the error register and visually indicated by a blinking LED at the transmitter. Since the DuoTec system independently monitors itself routine maintenance is not required. A detailed error description allows for fast and efficient error analysis. In case of an error an automatic procedure to safely shut-down a production line can be initiated.