DTL III Ex Digital Safety Temperature Limiter

Ex Proof Heat Tracing Equipment - DTL III Ex Digital Safety Temperature Limiter

The heating or heating circuits can be installed in both environmentally protected and hazardous areas. Thanks to the integrated power supply unit with wide voltage range, the devices can be used almost anywhere in the world.

DTL III Ex Digital Safety Temperature Limiter

• ATEX approved limite
• Optimised for trace heating applications (with service contact
• In conjunction with Pt100 Ex, it can be used for monitoring temperature in explosionprotected heating circuit

The DTL III Ex digital temperature limiter, which is adapted to (trace) heating applications, serves to monitor heating and heating circuits. The device is installed in the non-hazardous area. The heating or heating circuits can be installed both in media-protected and also in hazardous areas. Thanks to their integrated power supply unit with wide-range voltage, the devices can be used almost everywhere in the world

Function If the temperature at the Pt100 exceeds the set limit value, the DTL III Ex permanently interrupts the normally closed 16 A switch contact. This situation is detected by a volt-free alarm contact (change-over contact) and passes on the signal to the control panel. After a temperature drop of 5 K below the limit set point, or after a fault has been remedied, the limiter can be re-activated by means of a re-set button on the device itself or via a remote re-set control. The DTL will also interrupt the switch contact in the event of a sensor open or short circuit. Process reliability is increased by additional monitoring functions such as supply voltage monitoring, pre-alarm, measuring circuit monitoring for sensor break, interruption and short-circuit as well as undershooting/overshooting of the measuring range. A multi-stage password management is available for effective parameter protection. When doing service work on the heating circuit, the load output can be turned off by means of a digital input and the temperature alarms can be disabled. Using the programming interface, the device parameters can be read out with a programming key and transmitted to other devices.

Structure The DTL III Ex is integrated in a latch-on enclosure for TS 35 mounting rails. The alarm relay is produced as a change-over contact and the limit relay as a normally open contact. The voltage is supplied to the control device through an integrated power supply unit with wide-range voltage. The electrical connection is established with terminal screws operating on the screw cage clamp principle, ensuring a safe connection that is 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)