MPCnet TL Ex Temperature Limiter

Industrial Control Products - MPCnet TL Ex Temperature Limiter

The TL Ex safety temperature limiter is a constituent part of the MPCnet system and is used to monitor heatings and heating circuits. The heatings or heating circuits can be installed both in media-protected and also in hazardous (potentially explosive) areas

MPCnet TL Ex Temperature Limiter

• ATEX approval
• Optimised for trace heating applications (with service contact)
• Fault monitoring
• In conjunction with Pt100 Ex, it can be used for monitoring temperature in explosionprotected heating circuifs

The TL Ex safety temperature limiter is a constituent part of the MPCnet system and is used to monitor heatings and heating circuits. The device is for installation in non-hazardous areas. The heatings or heating circuits can be installed both in media-protected and also in hazardous (potentially explosive) areas.

Function If the temperature at the Pt100 sensor exceeds the set limit value, the TL Ex disconnects the load output permanently. At the same time a floating alarm contact is triggered. The alarm contact status is detected and processed by means of the digital inputs in the 8DI and 16DI modules and the digital input in the TR16, TR36 and TR38 power modules in the MPCnet. Once the temperature drops by 2 K below the switch-off point or after a fault has been remedied, the limiter can be reactivated by means of a reset button on the device. The TL Ex can transmit the temperature detected at the measuring input to the MPCnet by means of an integrated sequential system with a signal that is proportional to the actual value measured. This allows the temperature at the limiter to be evaluated in the control system also. The limiter function can be suppressed by a digital input when carrying out servicing work on the heating circuit, e.g. steam cleaning.

Construction The TL Ex is installed in a clip-on enclosure for TS35 mounting rails. The alarm relay and the limit relay are produced as change-over contacts. The DC 24 V voltage is supplied through the use of a top-hat rail on the underside. The electrical connection is established by means of screw-type terminals operating on the screw cage clamp principle, which ensures a reliable connection and is also gentle on conductors.

Application Areas:

• Oil and gas industry (refineries, platforms)
• Chemical industry (chemical plants)
• Mining
• Paint industry
• Flour and sugar factories
• High temperature furnaces (in hazardous areas)
• Heat treatment plants (in hazardous areas)
• Hazardous material storage
• Extruder Heating (in hazardous areas)
• Hot press applications (in hazardous areas)
• Heating cable applications (in hazardous areas)
• Sensor connections (in hazardous areas)
• Hazardous areas requiring remote temperature monitoring and control.