Thermotronik TT-77

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For more than 50 years the employees of Bühler Technologies have been have been developing, manufacturing and distributing components and system solutions in the “Gas Analysis“ and “Fluidcontrol“ divisions.

We offer flexible, system-compatible sensors and devices with state-of-the-art output signals for liquid level, temperature and pressure monitoring as well as for filter and moisture monitoring in hydraulic-systems. With the oil-water and oil-air coolers, filtering units and customer-specific subsystems, we meet today’s requirements in terms of a cost-effective and reliable operation of oil installations, even in hazardous areas. The Bühler Fluidcontrol product line extends the service life of oil and components, provides connectivity for automated operation, facilitates condition monitoring and helps reduce operating and maintenance costs.

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Put your trust in Bühler Technologies – your specialist for Gas Analysis and Fluidcontrol.


  • Electronic temperature switch
  • Up to four programmable switching outputs (plus hysteresis)
  • Alternatively, a continuous temperature signal (configurable to current or voltage) plus up to four freely programmable switching outputs
  • Characteristics of switching outputs configurable as window or hysteresis
    One switching output configurable as a frequency output (1 to 100 Hz)
  • Direct or external display and control installation
  • Easy to read LED display with status of switching outputs, rotatable by 270° when installed directly
  • VDMA-based (German Mechanical Engineering Industry Association) standard specification 24574 1 menu structure
  • Min/max value memory, logbook function
  • Sensor length up to 1 m / 3.3 ft

Changes in the viscosity of hydraulic oil and lubricants due to the temperature requires precisely monitoring and stabilising the operating temperature.

Carefully monitoring the temperature further also affects the service life of the oils. The oil tank is generally accepted as the control point for the oil temperature, which will usually provide helpful averages. It may further be helpful to also monitor segments or individual units within a system.

The values determined from the measuring points must be transferred to the system control according to standards. For safety reasons, it is advisable to at a minimum display the current oil temperature on the oil tank.
The Thermotronik TT-77F offers accurate oil temperature measurement and display in one and allows a variety of programming options for the display and signal output.
The Thermotronik TT-77W consists of a temperature sensor and the display unit for remote installation using the Easy Mount System and allows a variety of programming options for the display and signal outputs.
The large range of system-compatible temperature sensors is tailored for use in hydraulic and lubrication technology.

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