1250L Indicator/Safety alarm limit (FM)



  • Indicators 1250 L are used to limit overheating in industrial processes.
  • In the event of an alarm, the instrument latches the fault conditions until reset by the operator. A reset can be run by the operator from the front key (red R), from the digital input (optional), or serial line (optional).
  • As an additional feature, the instrument counts the number of times the alarm limit is exceeded and the total amount of time the alarm is active.
  • This information can help to evaluate furnace deterioration and plan maintenance work.
  • The displays show the process values, plus multilingual scrolling messages for diagnostics and alarms.
  • The 1250 L model includes a segmented bar that graphically displays the temperature deviation from the alarm limit.
  • Configuration and unit operation are done with the front keys.
  • The keys have dual-function LEDs indicating the pressing of the keys. The LEDs provide feedback for pressed keys and also provide guidance for permitted operations.
  • Initial commissioning is simplified by guided configuration text prompts that cover the commonly used base parameters accompanied by in-line help messages.
  • With GF_eXpress software and PC, you can program the extended configuration, create recipes and update the firmware without having to apply power to the instrument.
  • Thanks to the Smart Configurator function, you obtain the required configuration by answering a few simple questions.
  • The initial parameters can always be reset, both from the keypad and from the GF_eXpress software.
  • The devices offer complete diagnostics (broken or incorrect connection of sensor), operation count, and settable alarm limits (useful for scheduling preventive maintenance) A trigger meter and alarm memory reset timer are available for alarm 1.
  • Maintenance of the system in which the device is installed is made easier by the ability to replace the instrument at any time simply by removing it from the faceplate.
  • No additional steps are needed.


  • Safety high temperature alarm threshold with relay output
  • Retained alarm output with manual operator acknowledge
  • Dedicated frontal button for alarm reset
  • Counting of high temperature alarm tripping
  • Time totalisation of high temperature alarm tripping
  • Operator interface with large LCD Display, customizable, with choice of colors
  • Scrolling diagnostic messages, configurable, in the selected language
  • Easy, guided configuration, copy/paste parameters even with power off
  • Different password levels
  • Universal input configurable for thermocouples, RTDs, Current/Voltage inputs
  • Relay, logic,
  • RS485 serial communication in Modbus RTU
  • Removable faceplate for quick replacement
  • Sampling time 60 ms