Indicator & Alarm Unit - Type 2400 | Gefran

Gefran 2400 Display & Alarm Unit

The Gefran 2400 is a fast-response display/alarm unit, 96×48 mm (1/8 DIN), designed for high-speed process signals. It is not a PID controller; its primary functions are measurement, limit comparison, peak value handling, and retransmission of process variables to PLCs or data acquisition systems. The front panel includes 6 keys, a 5-digit LED display, and IP54 protection (IP65 with protective cover).

Measurement Inputs

Standard configuration provides 1 universal input for strain gauge, potentiometer, thermocouple, RTD (2/3 wire), and linear current or voltage signals, with accuracy better than 0.1% f.s. An optional second universal input is available for differential pressure or force measurements. There are also 2 auxiliary analog inputs and 2 digital NPN/PNP inputs for reset, calibration, hold, or alarm selection.

Outputs and Alarm Logic

Up to 4 relay or logic outputs are available, depending on model code. Alternatively, OUT3/OUT4 can be replaced by an MD8 expansion for 8 additional setpoint outputs. The unit supports up to 10 alarm setpoints, referencing IN1…IN4, mathematical functions, peak values, or serial line signals.

Peak, Calculations, and Retransmission

The 2400 stores maximum peak, minimum peak, and peak-to-peak values. The isolated analog output can retransmit input, peak value, setpoint, differential value, or mathematical function result as 0…10 V, 2…10 V, 0…20 mA, 4…20 mA, or ±10 V.

Communication and Power Supply

RS485 or RS232 with Modbus RTU are available, as well as Profibus DP slave. Power supply options: 100…240 Vac/dc or 20…27 Vac/dc, depending on version.

Typical Applications

• Melt pressure monitoring in extrusion and injection presses
• Differential pressure in filters or hydraulic circuits
• Force measurement from load cells or strain gauges
• Position feedback from potentiometers
• Test benches, dosing systems, laboratory setups

Standards and Certifications

CE declaration covers the 2400 series indicators/alarm units: LVD 2006/95/CE, EMC 2004/108/CE, EN 61000-6-2, EN 61000-6-4, and EN 61010-1.