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HT55 & HT55H

Auto Tuning Dual Temperature Controllers

Thanks to its free configurability, the HT 55 is a universal controller in machine, system and apparatus applications. In the design of this device, particular attention was paid to making its handling simple and comprehensible. Mounting on standard rails and the removable terminals (plug-in blocks) guarantee use even under difficult installation conditions in the switchgear cabinet.

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  • Depending on application selectable between 3 different controller outlets with 2 channels each
  • Both channels separately configurable
  • Also as controller limiter combination applicable
  • Switch-off temperature adjustable (0°C….500°C)
  • Self optimizing of control parameters
  • Alarm relay for 6 A
  • Robust and compact design



  • Wall mounting or rail mounting housing
  • 3-digit LED-Indication
  • Film keypad with 4 push buttons
  • Controller outputs with 2 Triacs each, mechanical relay or 12 VDC to control Solid State Relays
  • Dual temperature controller for e.g. all JCT heated sample lines
  • Dual temperature controller with additional excess temperature limiter via mechanical relays in case of alarm
  • Single temperature controller (Triac or SSR) with limiter function (permanent shut-off via mechanical relay)
  • Also universally applicable to control two different devices
Voltage supply230 Volt AC / 50 Hz or 24 Volt DC
115 Volt AC / 50 – 60 Hz optional
Sensor typesFe-CuNi (J), NiCr-Ni (K) PT100 NI-120, sensor breakage protection, sensor polarity control, short-circuit monitoring
Tolerance1 % of the relative temperature
Actual/target value display3-digit LED display (13 mm) scan operation between channel 1 and 2
Measuring range0 – 250 °C units
Controller output Avia 2 internal triacs max. power 1200 W for both channels together
Controller output Bvia two mechan. changeover relays, switching power 2 x 1500 W at 230 V AC
Controller output C2 x 12 V DC to control a solid state relay to switch higher powers
Configurationas dual controller, each channel is configured as a controller / limiter each channel monitors the other
Optionaltwo independent 4 – 20 mA inputs for external setting of setpoint
Protection typeIP40 (EN 60529), protection class I
Controller dimensions72 x 70 x 90 mm (H x W x D)
Connectionspluggable connection terminals
Operationparameter assignment and configuration using keypad
Special functionsself-optimization of controller parameters for fast adaptation to environmental conditions. Safety operation mode by connecting the relays before the triac control to switch off fault alarm. Setpoint limitation and setpoint correction adjustable. Attachment on 35 x 7.5 mm rail according to DIN 50022
Installation housing for HT 55
Housing dimensions HZ-EK 2for 1 unit 125 x 200 x 122 mm
Housing dimensions HZ-EK 4for 2 units 200 x 200 x 122 mm
Housing dimensions HZ-EK 6for 3 units 250 x 200 x 122 mm
HT 55 protection typeIP40 (EN 60529) without housing
IP65 (EN 60529) in installation housing
Designin accordance with VDE 0631


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