1650 Double loop PID controller, 1/8 DIN



Operator interface

  • Large LCD display with customization of plastic front panel color and logo.
  • Graphic display of power, output current, or valve position.
  • Scrolling alphameric display of 25 messages (32 letters each), completely configurable and savable, in three languages.
  • Thanks to language selection and clear scrolling messages for diagnostics, alarms, and process state, the controller speaks the user’s language.


  • Double loop, three configurable universal inputs for thermocouples, resistance thermometers, linear inputs. Aerospace and Automotive applications AMS2750/CQI-9 conformant.
  • Second input can be configured as a remote setpoint of a single loop.

Easy configuration

  • Guided configuration for manual-free programming, with a few essential parameters and online help messages.
  • Ability to clone configuration among controllers, even with power off and in the field, thanks to a mini portable configurator with a Zapper battery.
  • Extended configuration, creation of work recipes, and firmware updates via PC and GF_eXpress software, even without powering the controllers.
  • Thanks to the smart configurator function, you obtain the required parameter recipe by answering a few simple questions.
  • Local configuration and operation with only four keys assigned to LEDs that serve as feedback for the pressed key and as a guide to specifying appropriate steps.
  • The initial parameters can always be reset, both from the keypad and from the GF_eXpress Software tool.

Diagnostics, preventive maintenance and energy monitor

  • Complete diagnostics for broken or incorrectly connected probe, total or partial load break, out-of-range variables, and control loop faults.
  • Thanks to the switching count and to the settable alarm thresholds, you can program preventive maintenance to replace worn actuators.
  • An internal energy counter with an alarm for abnormal variations totalizes energy consumption and costs for constant control.
  • Function block applications 32 AND, OR, Timer Function Blocks let you create customizable logic sequences for complete and flexible machine control.
  • The controller’s hardware resources are exploited completely, without any need for external devices such as timers and small PLCs.
  • There are 8 math function blocks to process analog variables and add/subtract/multiply/ divide, calculate average, root, logarithms and control functions in cascade, and ratio check.
  • Options are available with 8 digital inputs/outputs and 8 additional relay outputs to be managed via function blocks with state signals via dedicated LEDs on the LCD display.


  • Advanced tuning algorithms ensure stable and accurate control even with critical or very rapid thermal systems, engaging automatically when necessary.


  • Three types of timers let you set delay times before activating the control, hold times on the setpoint value, and time changes of programmed setpoints.

Setpoint programmer

  • Models with 128 steps (each step consisting of a ramp and a hold), groupable in a maximum of 16 programs, are available for applications with setpoint profiles.
  • Enable inputs, event outputs, and messages to display can be assigned to each step.
  • Double programmer with synchronous and asynchronous base times for activating two setpoint profiles (even separate) assigned to the two loops.
  • On-board configuration and graphic configuration with GF_eXpress.

Valve positioner

  • Models to control motorized valves, with or without feedback.
  • The position is calculated for floating valves.
  • For valves with potentiometer via auxiliary input you can control and display the position.


  • Modbus RTU master/slave, Modbus TCP slave, and Bridge Modbus RTU/TCP.
  • Embedded Webserver interface for easy and quick remote service.

General characteristics

  • The controller is completely software configurable without accessing the internal electronics.
  • The universal main input accepts thermocouple sensors, resistance thermometers, and linear.
  • The controller can be replaced at any time simply by removing the faceplate, without any additional procedures.


  • Operator interface with large LCD display and three configurable bar graph
  • Scrolling diagnostics messages, configurable, in the selected language
  • Easy, guided configuration, copy/ paste parameters even with power off
  • Preventive maintenance with energy counters (kWh) and load switching
  • 32 function block applications
  • 8 math application blocks
  • Timer, setpoint and algorithm programmer for controlling motorized valves
  • Advanced tuning of control parameters
  • Different password levels
  • 3 universal inputs configurable for thermocouples, resistance thermometers, linear inputs
  • AMS2750/CQI-9 conformant
  • 2 PID control loop
  • 2 setpoint programmers (128 steps in 16 programs)
  • Relay, logic, isolated analog outputs
  • Up to two CT inputs for interrupted load diagnostics
  • RS485 serial communication in Modbus RTU
  • Removable faceplate for immediate replacement
  • Sampling time 60 ms
  • Modbus RTU master/slave
  • Modbus TCP slave
  • Bridge Modbus RTU/TCP
  • Webserver
  • Weekly clock (RTC)