ŽĎAS, a.s Measurements Accredited Testing Laboratory offers professional measurement services within engineering industry on accredited levels ensuring the quality and verifiability of test measurements and results through the accreditation according to ČSN EN ISO/IEC 17025:2018.
The accredited tests stated below are carried out according to professionally approved test procedures in compliance with currently valid standards and regulations.
The sound pressure and vibration measurements are performed in external sites and working environments according to particular standards (ČSN EN ISO 5349-2, ČSN ISO 2631-1, ČSN EN ISO 11202, ČSN EN ISO 9612, ČSN EN ISO 3746, and Government Regulation no. 272/2011 Coll.)
The subject of the test is the measurement of the sound pressure emission level at operator´s workplaces and of sound pressure immission levels at specified places within operating conditions.
Determination of sound pressure equivalent value level A at operator´s workplace is the output of the test. The sound pressure value A at operator´s workplace is used for Declaration of Conformity of particular machine equipment in compliance with Government Regulation no. 272/2011 Coll.
The subject of the test is the measurement of equipment sound power at operating conditions.
The determination of the sound power value A emitted by the noise source is the output of the test. The sound power value is used for Declaration of Conformity of particular machine equipment in compliance with Government Regulation no. 176/2011 Coll. and no. 22/1997 Coll.
The test is carried out in accordance with the standard ČSN EN ISO 3746 (Acoustics – Determination of sound power levels and sound energy levels of noise sources using sound pressure — Survey method using an enveloping measurement surface over a reflecting plane)
The subject of the test is the determination of exposure of humans to vibrations transmitted to hands and to total vibrations onto a standing person.
The determination of summary weighed vibration value for 8 hours is the output of the test; this value is then compared with the limits set in the Government Regulation no.272/2011 Coll. on health protection from adverse effects of noise and vibrations.
The subject of the test is the measurement and evaluation of human exposure to noise in the working environment.
The output of the test is the 8-hour standardized noise exposure level A including 8-hour standardized noise exposure A in all high-frequency third-octave bands, which is compared with the limits in the Government Decree on health protection from adverse effects of noise and vibration No. 272/2011 Coll.
The Measurements testing laboratory uses Brüel & Kjær instrumentation and control equipment for measurements of sound pressure and vibrations.
The subject of power measurement is the determination of equipment load amount (any machine furnished with power source for working activity). The equipment power size is determined using mechanical, hydraulic and pneumatic presses and other machinery namely for:
The testing laboratory Measurements uses industrial hydraulic jacks (measured power range 250 kN – 40 000 kN) and power sensors (measured power range 2 kN – 25 000 kN) for power characteristics measurement. DEWETRON multi channel measuring system DEWE-43 is used for value recording.
We perform Measurements of safety parameters in compliance with application of the Government Regulation no. 378/2001 Coll., defining detailed requirements for machine safe operation and use. The measurement of safety parameters (running-out of machinery or parallel session of buttons when a two-hand synchronous control is used) finds application not only in the process of conformity assessment of product design according to Act no. 22/1997 Coll. as amended, but especially during regular inspections of safety of operated machinery according to Government Regulation 378/2001 Coll. According to the Government Regulation the safety check shall be carried out before putting particular equipment into operation and subsequent check must be performed within 12 months.
(stopping time and running-out travel of equipment working part) to set safe distances of controllers and safety equipment (light curtains, covers, etc.)
The subject of the test is the determination of machine controller types (one-hand, two-hand, foot-operated, AOPD-active optoelectric protection devices = light barriers etc.). Determination of real distances of machine controllers and other safety devices from machine dangerous zone. Setting of protection device safety distances in accordance with particular standards ČSN EN upon the measured braking time.
The subject of the test is the determination of machine controller types (one-hand, two-hand, foot-operated, AOPD, etc.) and type specification (I, II, IIIA, IIIB, IIIC) according to the function catalogue data. I addition that also the measurements of parallel session time (synchronization) of controllers of all electrical two-hand operating elements type III which the particular machine is furnished with are carried out.
The subject of the test is to obtain information on functioning of forming machine brake and clutch separated systems upon which it is evaluated whether the brake and clutch functions overlap or not.
The machine stated safety parameters must move within the range specified by standard value (particular technical requirement included in relevant Czech standard).
For the measurements of safety parameters the Measurements testing laboratory uses its own developed measuring system together with commercially available system Safetyman DT2 from hhb Electronic.
The subject of the test is to find the amount of residual stress in material generated due heat and mechanical (machining) treatment. A single hole drilling method is used for determination of residual stress.
Main stresses amounts and orientations (directional angle of main stresses) are the test outputs.
The laboratory uses for the residual stress measurement HBM drilling appliance including HBM RY61-120/1,5 strain gauges and accessories. DEWETRON multi channel measuring system DEWE-43 is used for value recording.
In addition to the above stated accredited tests the Measurements testing laboratory carries out many other non-accredited tests:
The subject of temperature measurement is mostly the measurement of temperature distribution in chamber and cart-bottom furnaces during the entire heat treatment of a given batch including the course of cooling (free / flowing air, oil or water.
The laboratory uses for temperature measurement K-type sheathed thermometers (NiCR-Ni) of 2 -15 m length with temperature range -220°C to 1150 °C. For data recording Krypton multichannel gauge system from DEWETRON is used.
The subject of tensometric measurements is to determine the mechanical stress in various parts of machine structure:
For tensometric measurements the laboratory uses various types of foil resistant strain gauges (linear strain gauges etc.) with universal multichannel measuring system DEWE -43 from DEWETRON.
In addition to the accredited measurements of vibrations having effects on humans the laboratory also carries out multichannel measurements of vibrations including value analysis for:
The laboratory uses Brüel & Kjær multichannel measuring instrumentation for measurement vibration.
The laboratory carries out the pressure measurements mostly as a part of more complex measurements like:
The laboratory uses for pressure measurements various types of resistance pressure sensors (measurement range 0,5 MPa – 100 MPa) with DEWE-43 universal multichannel measuring system from DEWETRON.
The laboratory carries out the travel and speed measurements mostly as a part of more complex measurements like:
The laboratory uses various types of sensors for the speed and travel measurement: