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Thermocont® TU4S

Thermocont® TU4S

Universal temperature transmitter / temperature switch for general industrial applications


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  • Measuring ranges from -50°C up to +200°C
  • Wide variety of process connections
  • Sensor length up to 600mm
  • Long term stable platinum sensor class A – DIN EN 60751
  • Extremely short response times
  • Drift monitoring and redundancy function
  • High process pressure tightness up to 100 bar
  • Fully welded robust steel enclosure
  • High protection class IP69K/IP67
  • Very high accuracy to ≤ 0,1%
  • Electronic 4…20mA HART® / RS485 Modbus®-RTU / IO-Link®

Suitable for general applications in


  • Machinery and plant engineering
  • Air-conditioning and refrigeration plant engineering
  • Hydraulic and pneumatic systems
  • Process industry
  • Environmental technology

The device is an electronic temperature transmitter / temperature switch for monitoring, control and continuous measurement of temperatures.

A high variety of versions of process connections and electronic types allows the use for a wide range of applications, also for demanding measuring requirements.

Due to its high accuracy and the digital adjustability by HART®, RS485 Modbus®-RTU or IO-Link® the device can be suited to a wide variety of applications.

The optional drift monitoring and redundancy function increases the process safety. At exceedance of the set drift limit a signal will be generated immediately and thus, the product quality will be improved significantly.

Due to the use of two redundantly working sensors, which are mutually monitored, the calibration intervals can be increased und thus calibrations can be saved.

The pressure switch with front-flush O-ring gasket has been specifically designed for the measurement of viscous, paste-like, adhesive, crystallizing, particle-laden and contaminated media. 

The robust design and the high-quality workmanship turns the device into a very high quality product, which even the most adverse environmental conditions cannot affect, whether the lowest temperatures when used outdoors, extreme shock and vibration stress or aggressive media.

A captive laser marking of the type label ensures the identifiability throughout the entire lifetime of the device.

Obviously is the optional marking of a measurement point designation resp. TAG, a customer label or of a neutral type label, of course also per laser marking.

A LABS- resp. silicone-free version, a factory calibration with calibration certificate and a customer specific configuration resp. preset is also optionally available like a material test certificate EN10204 3.1 or a factory certifications for drink water suitability.

Customer specific special versions can be realized short-term on request, e.g. special designs for the process connection or other process materials.

Technichal data

Measuring range
Nominal temperature -50/0°C … +50/+100/+150/+200°C

Output type A – Current 4…20mA HART®
Analogue output 4…20mA 3,9…20,5mA / ≥ 3,8mA / ≤ 22mA / dI ≤ 1µA
Time behavior T90 ≤ 8ms / ton ≤ 0,2s
Interface HART®-compliant (7.0) / 1200 Bit/s

Output type V – RS485 Modbus®-RTU
Interface RS485, bidirectional / Modbus®-RTU / 9600 Baud (4800…38400 Baud)
Time behavior T90 ≤ 2ms (td = 0s) / ton ≤ 0,1s (td = 0s)

Output type L – IO-Link®
Interface IO-Link® V1.1 / Com2 (38400 Baud)
Analogue output 0…20mA: 0…20,5mA / ≤ 0,05mA / ≤ 22mA / dI ≤ 1µA
4…20mA: 3,8…20,5mA / ≥ 3,6mA / ≤ 22mA / dI ≤ 1µA
Switch output 2x PP (Push-Pull), switch to +L/-L
Output Uout ≤ 0,2V, ≥ Us – 2V / Iout 0…200mA (current limited ≤ 450mA, short circuit protected)
Time behavior T90 ≤ 2ms / ton ≤ 0,1s

Auxiliary power
Supply voltage Us polarity protected Type A – 4…20mA HART®: 9…35VDC
Type V – RS485 Modbus®-RTU: 6…35VDC
Type L – IO-Link®: 9…35VDC, without IO-Link® / 18…30VDC, with IO-Link®

Measuring accuracy
Characteristic deviation ≤ ±(0,25K + 0,002 * [t])
Long term drift ≤ ±0,1K/year
Temperature deviation ≤ ±0,2K 

Process conditions
Process temperature Standard: -50°C...+100°C
Extended: -50°C...+200°C
Pressure pressure ≤ 100 bar

Environmental conditions
Environmental temperature -40°C...+100°C
Protection level IP69K/IP67 (EN/IEC 60529)
MTTF 463 years