Special transducers and measuring apparatuses

We will be pleased to send more detailed information on above mentioned sensors and apparatuses on demand.

  1. Special accelerometers

Accelerometer TLA05 with the range of +/- 5g a frequency range of 0 to 1500 Hz was designed. The greatest advantages of the accelerometer are:

    1. possibility of calibration by turning upside down (+/- 180 g),
    2. possibility of feeding from multifunction card or battery (5 V),
    3. output signal (about 400 mV/g), which does not require amplification

Up to now more than 100 accelerometers TLA05/TLA05N were manufactured, most of which were supplied to technical universities (Institute of Mechanics of ČVUT Praha a ZČU Plzeň, Institute of Physical Engineering of ZČU Plzeň, Pedagogic Faculty of the University J.E. Purkyně Ústí n. Labem, Technical University Liberec). Accelerometers were used also with diverse vibro-diagnostic systems, e.g. at water power plant Vranov.

2.       For greater accelerations were developed transducers TLA 50N and TLA100 with the range of +/- 50g and +/- 100g.

Three channel adjusting unit can be supplied with transducers TLA05 or TLA50, ensuring the accelerometer feeding and enabling to set the same initial level and identical sensitivity of all transducers. The unit was supplied to the Institute of Physical Engineering of ZČU Plzeň and to Pedagogic Faculty of the University J.E. Purkyně Ústí n. Labem.

Vibrodiagnostic unit TL VD-3

3.       Vibrodiagnostic unit TL VD-3

Vibrodiagnostic unit was devised for the processing of signals from transducer TLA05, which can be modified for input from other types of sensors. The unit evaluates RMS value of acceleration and speed of measured vibrations in accordance with ISO 10816-1 and indicates exceeding of the preset value of the traced signal. The unit was successfully tested during the operation of fan mills at power plants Prunéřov and Tušimice.



4.       Capacitive apparatus TL-K1 for relative vibration measurement

The apparatus for contactless measurement of relative vibrations operating on the capacitive principle was designed. Especially when tracking the rotating subjects, the main advantage of the apparatus is absolute insensitivity to magnetic inhomogeneities, which can be a problem with transducers working on eddy currents or inductive principle. The apparatus was developed for diagnostics of small high-speed rotating machines with plain bearings, e.g. expansion turbines for helium liquefaction with aerodynamic bearings operating at speeds up to 3,5.105 rpm.

5.       System for excitation and measurement of dynamic processes

The system, consisting of function generator, amplifier and exciter with on-line connection to PC, enabling dynamic analysis of subjects was devised and was supplied to ZČU Plzeň, Institute of Mechanics.

6.       Dynamometers of weighing systems

Succession of strain gauge dynamometers for weighing systems of different type of cranes was designed. Dynamometers supplied by means of the firm SCS service Č. Brod were destined e.g. for several types of crane trolleys of the firm STAHL, for cranes of different lifting capacity of the firms NOPO and HM Ostrava and overhead travelling cranes ADAMEC. The specialities are the dynamometric pins into pulleys, enabling application of dynamometers without interference into crane construction, which were applied at the Škoda Auto.

Two channel apparatus for crack grow measurement

7.       Apparatus for crack growth tracing SRT-2k, SRT-6k

Two and six-channel apparatus for tracing the crack growth at test specimens from metal materials in the course of fatigue, rupture and creep experiments. The apparatus works on the principle of electric potential field deformation measurement in location of the crack by the original method of synchronous detection. The apparatus is suitable also for measurement of deformation (creep) and thickness of metal materials at high temperatures. Up now six apparatuses were supplied to prominent Czech institutions, e.g. Institute of Nuclear Research Řež, Chemical-technologic Faculty Prague, Faculty of Nuclear and Physical Engineering ČVUT Prague, Institute of Theoretical and Applied Mechanics and Institute of Plasma Physics of Academy of Sciences CR, and also abroad: Siempelkamp Drresden, SKC-CEN Brussel, Manchester Metropolitan University, JRC Petten, Departmento de cvalification y prubera de materiales Centro Nuclear de México.


Capacitor spot welder KS-2

8.       Capacitor spot welder KS-2

The welder was designed for micro-spotwelding of thin sheets and foils up to 0,3 mm. The welder was supplied e.g. to Roboterm Chotěboř, Škoda Plzeň Nuclear Engineering (for work in Nuclear Power Plant Temelín), Faculty of Nuclear Sciences and Physical Engineering ČVUT Prague, National Research Institute of Material Běchovice, Testsure Technology Ltd. Manchester etc.




9.       Examples of load cells made on special orders

Load cell for Škoda Auto

- Sensors of force at the stems of gate valves of the secondary circuit of Nuclear Power Plant Mochovce. Highly sensitive contact extensometres were designed to be mounted on motion screw of the stem

- Load cell for measurement at roentgen diffractometer. According to requirement of the Institute of Plasma Physics Academy of Sciences ČR the load cell with range of 500 N was designed, the geometry of which suited the appliance for four-point bending without reconstruction.

- Special load cell for measurement of camshaft bearing force for Škoda Auto 


Controlling and balancing stand for turbochargers

10.  Stand for vibration control and in-situ balancing of turbochargers in CZ Strakonice

In collaboration with DIOSS Nýřany two semi-automatic stands were developed, which perform vibration control and in case of higher vibration level enable to balance completed turbocharger (TBCH). The operation of the stand is governed by the controlling program, which processes data provided by balancing apparatus TLVA. The unit TLVA evaluates x and y components of unbalance vector based on vibrations in the compressor impeller location and the signal of phase sensor. The unit is able to work in the speed range up to 3,5.105 min-1. The output signals are processed by special SW in PC to amplitude and phase of the unbalance, while respecting all the time lags. By means of the TLVA unit the program controls run-up of the TBCH to balancing speed, determination of unbalance position and magnitude and then uniform run-up to maximum speed with continuous recording of vibration level. Recorded amplitude-frequency characteristics are stored in the archive files.