Gefran 1300: PID Temperature Controller
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The Gefran 1300 is a high performance configurable controller, widely used in industry for processes involving transmitters (4…20mA, 0…10V) and temperature sensors. The large display makes the digits legible at considerable distance.
Dimensions: 96x96, high performance, input: thermocouple, RTD,  4-20mA…

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Enhanced software and hardware allow a high degree of user configurability. It is particularly in combined Heat-cool control applications where the advanced algorithms come into play, allowing an extremely narrow band between heating and cooling without causing overlap.

The Gefran 1300 Microprocessor controllers, 96x96 (1/4DIN) format, is built with SMT technology. Complete operator interface, protected by Lexan membrane to guarantee an IP65 faceplate protection level.

Composed of 4 keys, double 4-digit green LED display, 4 red signal LEDs for the 4 relay/logic outputs and 3 additional LEDs with programmable function to signal the instrument's various function states.

The main input for the variable to be controlled is universal, and allows connection of a wide variety of signals: thermocouples, resistance thermometers, thermistors, normalized linear inputs, all with possibility of custom linearization set from the faceplate. Input type is selected entirely from the faceplate and requires no external adapter shunts/dividers.

A second auxiliary analog input from current transformer is available. You can select one of the two presettable setpoints, select Manual-Automatic mode, reset the alarm memory, or enable the hold function by means of the digital input.

The instrument provides up to 4 outputs: relay (5A, 250VAC/30VDC cos? = 1) or logic (24V ± 10% (10Vmin a 20mA)). An analog output in voltage or in current is also available.

The functions of each output are freely configurable from the faceplate. In addition to the control and alarm outputs, you can also have outputs that repeat the state of the digital or retransmission input by process variable, setpoint, deviation, alarm trip points and values acquired via serial line. An additional output (24VDC, 30mA max.) is available to power outside transmitters.

The serial communication option can be in Current Loop or RS485, with MODBUS RTU protocol and maximum speed of 19200 baud (485). The instrument's entire programming procedure is made easier by grouping the parameters in function blocks (CFG for control parameters, Inp for inputs, Out for outputs, etc.).

The instrument can also select the parameters to be displayed based on its hardware configuration, which automatically hides irrelevant parameters.

The instrument is supplied with an "EASY" configuration calling for just a few parameters (only those pertaining to the model ordered and essential to the controller's operation). In this way, you just have to set the setpoint and the alarm, then launch self-tuning with the specific button.

For even simpler configuration, you can use a PC programming kit consisting of a cable and a guided program for Windows environment (see accessories).


  • Choose from a wide range of software-selectable inputs, including 0-10V and 4-20mA.
  • Obtain perfect control by activating autotuning via button on faceplate, making commissioning very easy
  • Switch between two setpoints (e.g. “Run” and “standby”) via remote button or via button on instrument faceplate.
  • Know what the controller is doing : LEDs will flash when softstart or autotuning are in progress or when a sensor fault occurs.
  • Trigger pre-configured control functions (alarm reset, Auto Manual mode…) via remote switch.
Sensor Inputs: 
TC- Thermocouples:J, K, R, S, T, B, E, N, custom, L-GOST, U, G, D, C, (NI-Ni18Mo)
RTD 3-wires:PT100, JPT100
DC- Linear:With scale settable in limits: -1999...9999
0...60mV / 12...60mV
0...10V / 2...10V
0...5V / 1...5V
0...1V / 0,2...1V
0...20mA / 4...20mA
Imput impedance:
Ri > 1M? per 60mV,1V; Ri > 10K? per 5V, 10V; Ri = 50? per 20mA
Custom linearisation with 32 segment.
Auxiliary inputs:For current transformer
50mAac, 50/60Hz, Ri=10?
Digital:PNP: Ri = 4,7K? (24V, 5mA) insulation 1500V
NPN: voltage-free contact.
Function configurable among man/auto selection, local/remote (setpoint from serial line, setpoint1/setpoint2); Set/reset outputs, start/stop tuning functions, software off/on, reset alarm
memory, hold.
Sampling time:Acquisition of the input signal 120msec.
Precision:Accuracy 0.2%f.s. ± 1 digit
Digital input: 
Maximum number of outputs:4 configurable outputs:
• OUT1 relay (switching contact only with
OUT2 relay)
• OUT2 available in relay, logic or triac
• OUT3 available in relay, logic,
continuous or analog retransmission
• OUT4 relay or logic.
Analog C:0...10V, 0/4...20mA, on 500? max
only for heat/cool control output.
Relay:With rating: 5A/250Vac/30Vdc, cos?=1
Logic:24Vdc, Rout=100? (10V/20mA)
Triac:24...240Vac ± 10%, 50/60Hz, 1A max.
I2t = 128A2sec.
Leakage current 1.5mA max a 200Vac.
Analog W:0...10V, 0/4...20mA, on 500? resolution
12bit, for retransmission of the
variable or for control
Transmitter power supply:24V ±10% not stabilized, 30mA
Short circuit protection
Power supply:Standard: 100...240Vac/dc ± 10%
on request: 11...27Vac/dc ± 10%
50/60Hz, max. 15VA max
Protection by internal fuse not serviceable
by the user
Digital communication:RS485
Working temperature:0 to 50ºC

PID Temperature Control Loop: Heat-Cool Control

Application example: Plastic Blow Moulding Machine

The purpose of a temperature control loop is to maintain the process temperature accurately at a determined level.

unitemp: Heating, Sensing, Control Solutions

A control loop typically consists of

All parts in the control loop are essential and need to be selected, installed and set up correctly. 

It is particularly in combined heat-cool control applications where the advanced algorithms come into play, allowing an extremely narrow band between heating and cooling without causing overlap.

By tuning the three parameters in the PID controller algorithm, the controller can provide control action designed for specific process requirements.

For more information and to get a quote for the components illustrated in this control loop, please follow the links on top of the product images.

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Gefran eXpress Software
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