Indicator & Alarm Unit - Type 1250L | Gefran | Philippopoulos s.a.
Indicator & Alarm Unit - Type 1250L | Gefran | Philippopoulos s.a.
Indicator & Alarm Unit - Type 1250L | Gefran | Philippopoulos s.a.
Indicator & Alarm Unit - Type 1250L | Gefran | Philippopoulos s.a.

Indicator & Alarm Unit - Type 1250L | Gefran

Gefran 1250L Limit Indicator & Alarm Unit

The Gefran 1250L is an alarm limit indicator (48×96 mm, 1/8 DIN) designed for independent overtemperature monitoring in industrial process environments. This device is not a PID controller; it functions strictly as a limit instrument, with a retained alarm output that remains latched until reset by operator action, digital input, or via RS485 interface.

Measurement Inputs

Universal input supports TC types J, K, R, S, T, C, D, B, E, L, U, G, N, Pt20Rh-Pt40Rh, RTD Pt100/JPt100, IR sensors, and linear signals (0–60 mV, 0–1 V, 0–5 V, 0–10 V, 0/4–20 mA). Scalable range from -1999 to 9999, with sampling intervals selectable at 60 or 120 ms.

Alarm Outputs & Diagnostics

Up to 4 alarm functions assignable to relay outputs (NO 5 A / 250 Vac) or analog retransmission (0–10 V, 0/4–20 mA, 12 bit). Alarms configurable as maximum, minimum, symmetric, absolute, or relative, with memory, startup inhibit, and reset via button or contact input.

Operation & Maintenance

Front panel features LCD with PV, SV, F display, 11-segment bargraph for AL1 deviation, and reset key. The unit logs alarm activation count and total alarm duration, supporting maintenance planning and assessment of furnace or process wear.

Typical Applications

  • Independent high-limit alarm in industrial furnaces
  • Thermal zone monitoring in extruders, presses, dryers
  • Temperature supervision with manual acknowledge
  • PV retransmission to PLC, recorder, or SCADA
  • Applications requiring alarm trip logging

Operating Conditions & Standards

Power supply 100–240 Vac/Vdc or 20–27 Vac/Vdc, max 10 W. Operating temperature -10…+55 °C. Front panel IP65. Installation category II, pollution degree 2. UKCA declaration per EN 63000, EN 61326-1, EN 61010-1. FM Approvals classifies 650L/1250L as temperature limit switches.

Description

Technical specifications

Overview

Indicators 1250 L used to limit overheating in industrial processes.

In the event of alarm, the instrument latches the fault conditions until reset by the operator. 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 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 is done with the front keys.

The keys have dual-function LEDs indicating pressing of the keys. The LEDs provide feedback for pressed key 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, 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.

Description

• 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

Certifications