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Measurements

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.

Accredited tests performed by ŽĎAS Measurements Accredited Laboratory

The accredited tests stated below are carried out according to professionally approved test procedures in compliance with currently valid standards and regulations.

Measurements of sound pressure and vibrations.

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.)

Determination of sound pressure level at workplaces
and operator´s places of machines and equipment.

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.

Machine and equipment sound power at operating conditions.

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)

Measurement and evaluation of human exposure
to total vibrations and to vibrations transmitted to hands

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.

Measurement and evaluation of human exposure to noise
in the working environment

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.

BK 2250 sound-level meter from B&K

BK 2250 sound-level meter from B&K

Multi-analyser PULSE LAN-XI including acceleration sensors from B&K

Multi-analyser PULSE LAN-XI including acceleration sensors from B&K

Measurement of power parameters of machines and equipment

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:

  • Safety device function verification and setting to prevent overloading of the equipment
  • Gauging device setting
  • Verification of equipment max. power parameters
  • Verification or pressing force within specified technology
  • Determination of mechanical work on forging presses and power hammers
Placement of hydraulic jacks in LZK 4000 press working space for configuration of gauging device and safety device

Placement of hydraulic jacks in LZK 4000 press working space for configuration of gauging device and safety device

Measuring set for determination of mechanical work on power hammer

Measuring set for determination of mechanical work on power hammer

Verification of pressing force within specified forming technology -Sellier & Bellot a.s. transfer device for shell production

Verification of pressing force within specified forming technology -Sellier & Bellot a.s. transfer device for shell production

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.

DEWE-43 measuring system from DEWETRON

DEWE-43 measuring system from DEWETRON

DEWE-43 measuring system from DEWETRON

DEWE-43 measuring system from DEWETRON

Measurement of machinery safety parameters

Measurements of safety parameters

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.

Measurement of brake parameters

(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.

Light barriers

Light barriers

Setting the parallel session time of double-hand control

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.

Two-hand control

Two-hand control

Clutch and brake overlap test

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.

Safetyman DT2 measuring system from hhb Electronic

Safetyman DT2 measuring system from hhb Electronic

Measurement of residual stress by hole drilling method

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:

Temperature measurement

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.

Measurement of temperature distribution in chamber kiln

Measurement of temperature distribution in chamber kiln

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.

DEWE-43 measuring system from DEWETRON

DEWE-43 measuring system from DEWETRON

Tensometric measurements

The subject of tensometric measurements is to determine the mechanical stress in various parts of machine structure:

  • Verification of mechanical calculations of machine frameworks
  • Determination of mechanical stress during technological processes (forming, forging etc.)
  • Experimental determination of mechanical stress
Foil resistant strain gauges

Foil resistant strain gauges

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.

Measurement of vibration

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:

  • Vibration source identification,
  • Determination of equipment technical condition (technical diagnostics and vibro-diagnostics)
  • Verification of vibration and drop/fall test rooms.
Machine frequency analysis

Machine frequency analysis

The laboratory uses Brüel & Kjær multichannel measuring instrumentation for measurement vibration.

Pressure measurement

The laboratory carries out the pressure measurements mostly as a part of more complex measurements like:

  • Diagnostics and setting of press clutch-brakes
  • Verification and setting of hydraulic press admeasurements,
  • Verification of max. pressing force of hydraulic presses etc.

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.

Measurement of travel and speed

The laboratory carries out the travel and speed measurements mostly as a part of more complex measurements like:

  • Determination of mechanical stress during technological processes (forming, forging etc.)
  • Determination of mechanical work on forging presses and power hammers
  • Determination of play of press crank mechanisms
  • Determination of speed and travel of press pads etc.

The laboratory uses various types of sensors for the speed and travel measurement:

  • resistance travel sensors (measurement range 0 – 240 mm),
  • tensometric travel sensors (measurement range 0 – 6 mm),
  • induction travel sensors (measurement range 0 – 400 mm),
  • laser travel sensors (measurement range 0 – 200 mm),
  • pull-wire travel sensors (measurement range 0 – 2000 mm),

Contact

Ing. Daniel Říčan – Head of Measurements Department
e-mail:  mereni@zdas.czdaniel.rican@zdas.cz
Phone: 566 64 3683, 602 472 183