TLK94 Controller with universal input

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TLK 94-A 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 function (FAST or OSCILLATING type), 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. The process value is visualized on 4 red display, the Set value is visualized on 4 green display while the outputs state is indicated by 6 led. The instrument can have up to 5 outputs: relay type or to drive solid state relays type (SSR).


  • 48x96 mm panel mount controller with dual display,
  • 1 probe input
  • up to 6 relay outputs or 2 analogue outputs and 4 relay outputs
  • Optionals: Current transformer input, 2 digital inputs and RS485 serial port

Process inputs:
1 universal input for temperature probes:
TC type: J,K,S,B,C,E,L,N, R,T;
IR probes (J, K type)
RTD : Pt 100 IEC, Pt1000 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..1V, 0/1...5V, 0/2...10V
Current (mA) signals (shunt): 0/4...20 mA
1 Current transformer input (50 mA)
2 Digital Input
- Free voltage

Process outputs:
Up to 6 outputs according to the model selection:
Out 1:
- Relays SPST-NO (6 A-AC1, 3 AAC3/ 250 VAC)
- SSR drive voltage output (8mA/ 8VDC)
- Analogue output
  * 0/4 ..20 mA (Load Max. 300 Ω)
  * 0/2..10 V
Out 2:
- Relays SPST-NO (4 A-AC1, 2 A-AC3 / 250 VAC)
- SSR drive voltage output (8mA/ 8VDC)
- Analogue output
  * 0/4 ..20 mA (Load Max. 300 Ω)
  * 0/2..10 V
Out 3,4,5:
- Relays SPST-NO (4 A-AC1, 2 A-AC3 / 250 VAC)
- SSR drive voltage output (8mA/ 8VDC)
Out 6 (alternative to Auxiliary power supply):
- SSR drive voltage output
  12 VDC / 20 mA Max.

Power supply:
- 24 VAC/VDC
- 100... 240 VAC ±10%
Frequency: 50/60 Hz
Auxiliary power supply for external transmitters (optional):
- 12 VDC/20 mA Max.

Control functions:
Control strategies :
ON/OFF with neutral zone
PID single or double 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 Slave for:
  * PC configuration
  * Connection to third party devices.
- Communication on TTL port to:
  * Universal programming key
  * Remote display

48x96 mm, depth 98 mm
- 2,5 mm² screw terminals block
IP54 front frame protection, with gasket
2 displays with 4 digits, red and green colour, height: 14 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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