Indicator & Alarm Unit - Type 650L | Gefran | Philippopoulos s.a.
Indicator & Alarm Unit - Type 650L | Gefran | Philippopoulos s.a.
Indicator & Alarm Unit - Type 650L | Gefran | Philippopoulos s.a.
Indicator & Alarm Unit - Type 650L | Gefran | Philippopoulos s.a.

Indicator & Alarm Unit - Type 650L | Gefran

Gefran 650L Limit Indicator Unit

The Gefran 650L is a 48×48 mm (1/16 DIN) alarm limit indicator designed for independent safety limit monitoring in industrial process environments. It is not a PID controller. The alarm output remains latched after a limit violation and requires manual reset via front panel key, digital input, or serial communication.

Measurement Inputs

Universal input supports thermocouples J, K, R, S, T, C, D, B, E, L, U, G, N, Pt20Rh-Pt40Rh, RTD Pt100/JPt100, and linear signals 0–60 mV, 0–1 V, 0–5 V, 0–10 V, 0/4–20 mA. Scaling range is -1999 to 9999 with decimal point. Sampling time selectable at 60 or 120 ms.

Outputs and Alarm Logic

Up to 4 alarm functions assignable to outputs. Relay outputs are NO, rated 5 A / 250 Vac. Optional isolated analog retransmission 0–10 V, 0–20 mA, or 4–20 mA, 12-bit resolution. Alarms configurable as maximum, minimum, symmetric, absolute, or relative, with memory, startup inhibit, and reset via key or contact.

Diagnostics and Maintenance

LCD displays PV, SV, and rolling diagnostic messages. Unit detects sensor open/short circuit and provides over-limit and alarm time counters, supporting preventive maintenance for furnaces, thermal zones, or safety loops. Front panel replacement possible without disconnecting wiring.

Typical Applications

  • Independent high-limit alarm in industrial furnaces
  • Thermal zone protection in extruders and presses
  • Temperature over/under alarms from TC or RTD
  • PV retransmission to PLC, recorder, or SCADA
  • Critical limit monitoring with manual operator confirmation

Operating Conditions and Standards

Power supply 100–240 Vac/Vdc or 20–27 Vac/Vdc, max consumption 5 W, front panel IP65, operating range -10…+55 °C. UKCA declaration references EN 63000:2018, EN 61326-1:2013, and EN 61010-1:2010.

Datasheet and documents

Description

Technical specifications

Overview

Gefran 650L Series indicators are designed to interrupt the output in the event that the safety limit of an industrial process is exceeded.

Once a limit exceeded event occurs it is latched until reset by an operator acknowledgment action.

This reset can be done by the operator from the specific (red R) front key , digital input (optional) or serial line (optional).

The displays show the process values, plus multilingual scrolling messages for diagnostics and alarms.

The local configuration operation is performed with front panel keys. Permitted key presses are highlighted by their associated LED’s above each key.

Easy commissioning is accomplished with a simplified and guided configuration for manual free programming, with only a few required parameters accompanied by intuitive on display help messages.

Using GF_eXpress software with a programming cable and PC, you can program the extended configuration, create recipes and update the firmware without having to switch on the instrument.

Thanks to the Smart Configurator function, you can create the initial required parameter recipe by answering a few simple questions. The parameters can always be reset, either from the keypad or from the GF_eXpress software.

The device offers complete diagnostics for a broken or an incorrectly connected sensor and has operation counters with settable alarm limits which are useful for scheduling preventive maintenance. A trigger counter and alarm memory reset timer are available for alarm 1. This information can help to evaluate furnace deterioration and plan maintenance work.

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 case. No additional steps are needed.

Description

•Latched Setpoint Alarm relay to interupt the output in the event that the safety limit is exceeded

•Alarm output remains latched until acknowledged by operator input

•Alarm reset from front key, remote digital input or serial communications

•Alarm limit exceeded count

•Alarm limit exceeded timer

•Operator interface with large LCD Display, customizable, with choice of colors

•Scrolling diagnostics messages, configurable, in the selected language

•Easy guided configuration even with power off using GF_Express Software

•Multiple password levels

•Universal input configurable for thermocouples, resistance thermometers, linear or custom inputs

•Relay, logic and optional outputs

•RS485 serial communication in Modbus RTU

•Easy swap case for simple replacement

•Sampling time 60 ms

Certifications

UK Conformity Declaration - 650L

FM 650L-1250L

EU Conformity Declaration 400, 401, 40T72, 450, 1000, 1001, 1101, 600, 600OF, 650, 1250, 1350, 1200, 1300, 800, 1600, 1800, 3400, 3500, 4400, 4500, 2301, 2500, MD8, GFXTERMO4