TLK31 Controller with programmable input

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TLK 31 is a “single loop” digital microprocessor-based controller, with ON/OFF, Neutral Zone ON/OFF, PID single action, PID dual action (direct and reverse) control and with AUTO-TUNING FAST function, SELF-TUNING function and automatic calculation of the FUZZY OVERSHOOT CONTROL parameter for PID control. The PID control has a particular algorithm with TWO DEGREES OF FREEDOM that optimises the instrument’s features independently in the event of process disturbance and Set Point variations. Furthermore, the instrument allows for 2 digital inputs and RS485 serial communication using MODBUS-RTU communication protocol and a transmission speed up to 38.400 baud. The process value is visualized on 4 red displays, while the output status is indicated by 4 LED displays. The instrument is equipped with a 3 LED programmable shift indexes . The instrument provides for the storage of 4 Set Points and can have up to 4 outputs: relay type or can drive solid state relays type (SSR).


  • 78x35 mm panel mount controller with single display, 1 probe input and up to 4 relay outputs
  • Optionals: 2 digital inputs and RS485 serial port

Process inputs:
1 input for temperature probes:
 - TC type: J, K, S
 - IR probes (J, K type)
 - RTD : PT100 IEC
 - PTC KTY81-121 (990 Ω @ 25 °C)
 - NTC 103AT-2 (10KΩ @ 25 °C)
 - Voltage (mV) signals: 0...50 mV, 0...60 mV, 12 ...60 mV
 - Voltage (V) signals: 0..1 V, 0/1...5 V , 0/2...10 V
 - Current (mA) signals (shunt): 0/4...20 mA
2 digital inputs:
- Free Voltage

Process outputs:
Up to 4 relay outputs according to the model selection:
Out1, Out 2:
- Relays SPDT (8 A-AC1, 3 A-AC3 / 250 VAC)
- SSR drive outputs (10mA/10VDC)
Out3, Out 4:
- Relays SPST-NO (8 A-AC1, 3 A-AC3/250 VAC)
- SSR drive outputs (10mA/10VDC)

Power supply:
- 12 VAC/VDC ±10%
Auxiliary power supply for external transmitters (optional):
- 12 VDC /20 mA max.

Control functions
Control strategies :
ON/OFF with neutral zone
PID single or dual action (Heat/Cool) with two degrees of freedom alghoritm
- SELF-TUNING function
- FUZZY OVERSHOOT CONTROL automatic calculation
Soft start
Bumpless ramp for set point change
Up to 3 configurable alarms + loop break alarm
Total Accuracy: ± 0,5 % fs

Communication and configuration
- Serial communication port: insulated RS485 Modbus-RTU
  For PC configuration, supervision or connection to third party devices
- Communication on TTL port to:
  - Universal programming key
  - Remote display

78x35 mm, depth 75.5 mm
- 2,5 mm² screw terminals block
IP65 front frame protection, with gasket
1 red display with 4 digits, height: 12 mm

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“Industrial Technical Services is a single source Instrumentation and Automation company. We provide certified calibrations, PLC programming, custom controls and Panels”.


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