Gefran Model 400-401 Single Display Controller

These Gefran product are microprocessor controller, manufactured using SMT with a 48x48 (1/16 DIN) format.
It has a complete operator interface, protected by a Lexan® membrane that ensures a face plate protection level IP65.
It have 4 keys, 4 digits display, 2 indicating LED's for 400 model, and the 401 model has 3 indicating LED's and a further 3 LED's bar-graph.
The main input for the process variable and provides the possibility to connect many types of input sensor:

  • Thermocouple type J, K, R, S, T, B, E, N
  • Resistance thermometer PT100 3-wires
  • Linear inputs 0...60mV, 12...60mV, 0...20mA, 4...20mA, 0...10V, 2...10V
  • Thermistor PTC
From the faceplate keys is where the type of input is selected and no external shunts or adapter are required. 
Model 401 can have an auxiliary input for a 50mAac current transformer to monitor the load current. 
It is also possible to set an alarm point related to the current transformer input in order to check eventual load malfunction. 
The 400 model has 2 (3 for 401 model) relays (5A/250Vac, cosφ=1) or static (10Vdc/30mA) outputs with Heat, Cool or Heat/Cool not overlying/or alarm function. 
All the programming procedures of the instruments are handled by the grouping of the parameters in function blocks 
(CFG for the control parameters, Inp for the inputs, Out for the outputs, etc.) and 
so it’s possible to selecting a simplified menu for entering the most frequently used parameters. 
To simplify the configuration even further, a programming kit is available for PC, 
which includes a menu driven configuration program for Windows and the necessary cable to connect the instrument. 
A configurable personal software protection code (password protection) can be used to restrict the levels of editing and displaying the configuration parameters.


  • Universal input configurable from the faceplate
  • Possibility of auxiliary input for current transformer 50mAac or 3rd alarm output,
  • Self-tuning, Auto-tuning, Soft-start, Man/Auto function
  • Accuracy better than 0,2% full scale at nominal condition
  • Control output: relay or logic with Heat/Cool function
  • 1 alarm with configurable function (up to 3 different alarm setpoints)
  • Deviation bar graph indication
  • Possibility to configure the unit by serial line logic or relay (only 401 mod.)