News

From now on you can find here our brochure "KERN test Service - DAkkS calibration and verification service for balances, test weights, force measurement and more" in the new version 2021.
You can download it as a PDF by clicking on the image.

The following relevant changes have been made in the new brochure:

• Detailed indication of the contact persons, so that you always have the right contact person for your request immediately at hand
• Extension of the calibration prices for DAkkS calibration of balances on page 11 to include the new category "high-resolution precision balances"
• Factory calibration in the range of force up to max. 250 kN instead of max. 125 kN as before, to be found on page 20

Dear business partners, the good news is that we are maintaining our business operations in full for you. Nevertheless, due to the current developments around Corona (COVID-19), we are immediately taking the necessary safety measures to protect the health of everyone. This may cause slight delays in our usual fast order processing. We thank you for your understanding. Stay healthy.

Your KERN DAkkS Calibration laboratory

Mit Änderung der nationalen Eich-Gebührenverordnung zum 08.05.2019 gibt es auch eine Änderung der Eichgültigkeit von nichtselbsttätigen Fertigpackungskontrollwaagen.

Dies bedeutet, dass sich die deutsche Nacheichfrist für Fertigpackungskontrollwaagen von einem Jahr auf zwei Jahre verlängert.

Alle weiteren Eichfristen finden Sie hier.

Wir haben unsere Akkreditierung durch die DAkkS erfolgreich im Rahmen einer "Reakkreditierung" erneuert. Bitte beachten Sie, dass die neue Urkunde ab sofort nicht mehr befristet ist.

Unsere aktuelle Akkreditierungsurkunde sowie deren Anlage finden Sie hier.

Weitere Informationen zum Thema "unbefristete Akkreditierung" finden Sie hier auf der Seite der DAkkS.

Since it is important for us to constantly improve our services for you, we attach great importance to your opinion.
We would really appreciate if you could take a moment to fill in our feedback form.
Any criticism or praise helps us to constantly improve our calibration laboratory for you.

For this there are two different feedback forms available. It only takes about 2 minutes to fill in.

Feedback calibration laboratory

Feedback order processing

Of course your data will be treated confidentially. The results will be recorded anonymously and are only evaluated in connection with this survey.
Your feedback will not be used for other purposes or passed on to third parties.

Thank you very much in advance for your support and we hope to continue to count you to our customers in the future!

For the DAkkS calibration of balances the standard procedures of EURAMET cg-18 are used. This particularly defines, which measuring points have to be considered for a certain and traceable calibration.

For sure we already extended the measuring points of the repeatability and accuracy measurement on customers requirements in the past additionally to the distributed standard measuring points for the calibration of balances.

Now we added this additional service to our range. For the accuracy measurement it is possible to expand to as much measuring points as you require. For the repeatability measurement we can offer max. 10 measuring points in total.

Here you can find the prices for the calibration of balances as well as the prices for the new additional measuring points:

*¹ For the recalibration of crane scales the filled and signed safety certificate is needed.
*² For further information about our certificates of conformity click here.

The DAkkS accreditation of the KERN calibration laboratory in the range of force was expanded recently!

By installing new and fully automatic force calibration machines of highest accuracy we were able to increase the accredited measuring range for force gauges at 2N up to 5kN in push and pull force.
So from now on it is also possible for us to DAkkS calibrate your force gauges in this range!

The calibration will be performed according DAkkS-DKD-R 3-3 for the following range:

You can also find the details on our annex of the accreditation certificate.

You are welcome to send your force gauges directly to our calibration laboratory. Your advantages at one sight:

• fastest processing times: Standard - 4 working days / express - within 48 hours (details on demand)
• competence: calibration laboratory, which fulfills the highest Standards
• calibration according to DAkkS-DKD-R 3-3 which fulfills DIN EN ISO 9001 requirement of traceability
• Independent of brand: we can calibrate measuring devices irrespective of their manufacturer
• repair: necessary repairs can, if desired, be carried out immediately

Of course a works calibration of your foce gauge is especially for other measuring ranges still possible.

At the following you will find the explanation of the components of an calibration certificate for force gauges.
Depending on the force gauge and calibration bearing the content may diversify.

1. "Official" document

The KERN DAkkS calibration laboratory (D-K-19408-01-00) is accredited through the accreditation Point of the German calibration service. The DAkkS calibration certificate is recognised internationally and is available in several languages.

 

2. Item to be calibrated

The calibration item as well as the type or model with serial number is documented. This means that there is no confusion and guarantees the assignment of the DAkkS calibration certificate to a specific balance.

 

3. Traceability

The reference standards of the accredited laboratory are monitored in strictly defined cycles and periodically brought into line with national and thereby international standards. This is carefully documented and given on the DAkkS calibration certificate. In this way the basic fundamental traceability to the national standard is ensured.

4. Contracting authority

On the very first page of the DAkkS calibration certificate you will clearly see the applicant or operator of the calibrated checking equipment.

 

5. Measurands

In this part of the certificate for every direction of force the "rough" measurands of the calibration will be documented for traceability. Depending on precognition of the measuring device, e.g. its type and of course the customer's desires, different calibration processes according to DAkkS-DKD-R 3-3 can be applied. The calibration processes vary in amount and sort of the processed test series (especially in mounting position and rising resp. descending load) and allow to adept the complexity to the customers requirements of accuracy.

Using the example calibration process A is shown. First the force gauge will be loaded three times with preload at calibration maximum load. Then 6 test series within 3 different mounting positions will be assimilated:

• Loading done twice with increasing load (test series R1, R2') within mounting position 0° (generally not exactly defined Arrangement)
• Rotation of the device (to 120°), preload, loading with increasing and decreasing load (test series R3, R4')
• Rotation of the device (to 240°), preload, loading with increasing and decreasing load (test series R5, R6')

Because of the loading done twice with as identical as possible conditions the repeatability can be determined.

The rotation - and for this reason necessary anewed mounting into the loading mechanism - allows conclusion to model and device significiant incertitude at the initiation of calibration force of the device and whose sensibility on it (reproducibility)

The influence of hysteresis of the measuring system on the shown measurand appears by decreasing load at test series R4' and R6'. The mechanical load (distortion, warping) as well as the creep by e.g. thermal effects result that the measurand differes at unloading and loading despite identical calibration force (hysteresis error).

Especially the return to zero therefore is a dimension for the creep of the measuring device while loading.

6. Measuring results

Out of the "rough" measurands the relative technical measurement parameters of the calibrated force gauge can be calculated. At the following the imprinted values within this section of the calibration certificate will be stated, the calculation itself is specified exactly at the calibration norm DAkkS-DKD-R 3-3.

• arithmetic average: the average of the about zero indication corrected displayed values at a loading increment across all test series. It is the best estimated value for the display of the measuring device at the current applied force.
• rel. repeatability b': dimension for the dispersion of the displayed value at identical conditions.
• rel. reproducibility b: dimension for the dispersion of the displayed value at different mounting positions.
• rel. hysteresis error v: dimension for the hysteresis (and drift) at the displayed value at decreasing load.
• rel. deviation of calibration terminal value: comparison of the display at immediate load (at the preload) and "slow" load with calibration maximum load (at test series R1)
• rel. deviation of zero-point: comparison of the display before load and after complete unload, dimension fot the drift during load.
• Y₃: by a third-degree polynomial approximated display value of the current development.
• approx. dev. f_c: The rel. deviation of this approximation of the actual display value.
• exp. measuring uncertainty: the expanded measuring uncertainty of the determined deviation
• rel. exp. measuring uncertainty: the expanded measuring uncertainty relative to the applied force.

 

7. Interpretation of the measuring results

The measurement and measuring results mentioned on the preceded page document the indication error of the measuring device at the respectively applied calibration force. There is made no statement for the whole measuring range.

An adjustment theory about the medium display values in the post-assembly positions allow to estimate the indication error of the device over the whole measuring range at optional load. The result of this adjustment theory (with a polynomial of third class under application of the "least squares" method) can be found on page 4 of the calibration certificate.

• indication Y at force x (Y₃):
  If force x is applied, the force gauge should Show indication Y₃(x).
  The table represents these theoretical display values at a multiplicity of applied force.
  A. B and C therefore are coefficients of the polynomial.
  
  
• indication X at force y (X₃):
  If the force gauge shows the value y, it should be the actual applied force X₃(y).
  R, S and T therefore are coefficients of the polynominal.

 

 

Below you can find the prices for a DAkkS calibration of force gauges which are pretty economy regarding the competetive comparison. You can also find the price list here.

DAkkS calibration, pull

DAkkS calibration, push

DakkS calibration, push and pull

*valid only for Sauter devices, for other manufacturers the price for calibration without interface will be charged.

We are looking forward to calibrate your force gauges in the future in a fast and cost-efficient way!

Now it is possible to check your order status directly online.

For this you only need the number of the order confirmation as well as your customer number, which you can also find on the order confirmation.

As soon as you entered this data your latest order status will be shown.
You can also download documents corresponding to the order like delivery note, invoice and as well the calibration certificates of your equipment.
It is also possible to track your delivery with one click if the order was already sent.

From now on you will find a new feature on kern-lab.com: our online Price quote generator.

No matter if for your weights, balances of other measuring devices - our price quote generator will offer you the appropriate price for any calibration within the range of our accreditition.
A possible option is also the works calibration as well as the reverification of balances and weights.

The creation of your offer ist quite simple: Choose your equipment that has to be recalibrated, enter your contact details and you will get your offer - suitable, transparent and without any delay.

You do not have the possibikity to send your equipment and desire the organization by us? No problem, this is also a chooseable option.

If you have any further questions please feel free to contact our Team.

With the calibration of UCI hardness testers we may present you the latest Expansion of our service offer. From now on, we are able to take over this service for you - as usual, competently and quickly. Find out more about the prices and check out a sample calibration certificate.

 
Find out more about the prices and check out a sample calibration certificate.

The equipment qualification (also called system qualification) checks whether the technology used in the device is suitable for their intended tasks and can be used. It is determined whether a balance for a particular process meets the necessary accuracy requirements.

Read here all about a complete equipment qualification.

What you always wanted to know about calibration and verification - our new booklet "DAkkS calibration and verification service" provides the answers. Beside the prices you will find in this interesting reading matter a lot of useful information about our services in the field calibration and verification.

Just start to read here. 

From now on, the digital version of your DAkkS calibration certificates is available for you at any time - conveniently and from anywhere. Searching is over. All you need is just the number of the certificate, that you´re looking for, and another order-related criteria. Just with a few mouseklicks, you can save and/or print your desired certificate respectively your certificates.

Give it a try in the Register DOCUMENTS/Certificates download or klick here.

From now on another service completes the range of KERN: the temperature calibration of moisture analyzers. Complying the correct temperature is crucial for the comparability of the results of moisture determinations. Regular calibrations of the temperature can guarantee this - please just contact us.
Find out more about it here.

Do you already know our latest calibration service? KERN has expanded its range. The factory calibration of torque wrench testing devices (full scales values in the range of 1N to 200N) is another point in the wide service portfolio of the KERN laboratory. Find out more about it.

Since 01.07.2016 the International Maritime Organisation (IMO) changed the international agreements for protection of human life at sea (shortly: SOLAS - Safety of Life at Sea) to improve safety at sea and minimize dangers while the sea freight transport.  This means that the gross mass of a container (VGM - verified gross mass) has to be calculated before loading on ship - otherwise a shipment will not be possible any longer. One method for this is to weigh the fully loaded container on a suitable weighing station (certified scale of accuracy class 3).

The demands on the weighing stations are as follows:

• The scales must have a conformity assessment according to 2014/31 / EU.
• According to currently valid calibration law charge measurements for ships are not currently included in the law. Verification is therefore not required, but a regular calibration of scales by DAkkS is recommended. KERN is the ideal Partner for that.
• International unified rules for submission and the deadline of the submission of VGM are not given.

Date of this information is july 2016.

As of 04.20.2016 the EU new standards apply, in particular for placing scales on the EU market.

The following relevant directives are affected by the this date:

•      Low Voltage Directive 2014/35/EU
•      EMC Directive 2014/30/EU
•      ATEX Directive 2014/34/EU
•      Measuring Instruments Directive 2014/32/EU
•      Directive to non-automatic weighing 2014/31/EU
•      Directive on explosives for civil uses 2014/28/EU

Impact on "verified" Scales

The amendments to the regulations also mean that devices that are "verified", starting from 20.04.2016 are labelled in a new way.

Furthermore, the declaration of conformity comes with a new feel - with only slightly different content.

Seit dem 01.01.2015 gilt in Deutschland das neue Mess- und Eichgesetz  (MessEG) und die Mess- und Eichverordnung (MessEV). Paragraf § 32 des MessEG fordert: Wer neue geeichte Messgeräte verwendet, hat diese der nach Landesrecht zuständigen Behörde spätestens sechs Wochen nach Inbetriebnahme anzuzeigen.

Der Verwender von neuen oder erneuerten Messgeräten ist verpflichtet innerhalb von
6 Wochen nach Inbetriebnahme die Verwendung bei der zuständigen Eichbehörde anzuzeigen.

Mit ab-Werk geeichten Waagen erhalten Sie ein bereits vorausgefülltes Formular, das Sie - wenn erforderlich - nur noch vervollständigen und versenden müssen.

Since 14.05.2014, the KERN calibration laboratory is DAkkS-accredited.

Starting from this date, calibrated balances and weights will be labelled with a blue calibration mark. Also, the calibration certificate comes with a new layout.

You can find more information in the DAkkS section.

Im Bereich 1 mg bis 10 kg umfasst unsere DAkkS-Akkreditierung kleinst-angebbare Messunsicherheiten, welche der Klasse E1 gemäß OIML R111-1 entsprechen. Diese Messunsicherheit berücksichtigt alle Einflüsse, wie die des Komparators (Wiederholbarkeit), der Umgebungsbedingungen (Luftauftrieb, Konvektion) und des Referenzgewicht (Abweichung, Drift).
Da der Aufwand zur Erzielung dieser Messgenauigkeit sehr groß ist, können nur sehr wenige private Labore diese erreichen.
Unsere Kalibrierroboter messen Gewichte dieser Genauigkeit ausschließlich am Wochenende und können auch sehr kleine Gewichtsänderungen im Bereich von 20 µg (bei 1 kg) erkennen.
Ein 1 kg Gewichtstück können wir demnach mit einer erweiterten Messunsicherheit (k=2, 95%) von 0,15 mg = 150 µg kalibrieren.
Die Korrektionen an den Kalibrierscheinen unserer Referenzgewichte von der PTB (angegebene Messunsicherheit von 50 µg) betrugen 30µg (zeitabhängig).
Sie sind auch linear abhängig von der Last, so dass ein 100g Gewicht nur eine Korrektion von 1/10, d.h. 3 µg hat.
Diese Änderung konnten wir in Trendverläufen gut erkennen, sie haben jedoch keinen kritischen Einfluss auf die Kalibrierungen von Kundengewichten, die wir nach außen geben.

Während im Labor solche Differenzen spürbar sind, sind die Auswirkungen auf die Industrie recht gering.
Sehr hochwertige Waagen im Pharma-/Laborbereich haben bei 1 kg Ablesbarkeiten von d= 1 mg = 1000 µg.
Hier werden meist Gewichte der Klasse E1 eingesetzt, welche wie oben beschrieben bereits eine Messunsicherheit von U=150 µg haben. Oft wird die im Kalibrierschein dokumentierte Abweichung nicht verwendet, sondern das Gewicht zu seiner Toleranz gemäß OIML R111 von 500 µg eingesetzt.
Die „Messunsicherheit“ des Wägeergebnisses beim Kunden wird darüber hinaus noch von vielen anderen Einflüssen wie Luftauftrieb, Konvektion, statische Aufladung, Erschütterungen etc. bestimmt.
Die meisten Wägungen in der Praxis in diesem Anwendungsbereich werden daher auch nicht auf diese 1 mg genau sein.
Ein messbarer Einfluss der 50 µg Korrektur ist in der Industrie daher nicht erwägenswert, eine Auswirkung auf universitäre Forschung oder ähnliche Bereiche kann jedoch nicht ausgeschlossen werden.

Sehr geehrter ,

in der Arbeitsanweisung zum Kundenportal gab es wichtige Änderungen.
Neben der Beauftragung durch den Verwender ist nun auch die Beauftragung durch den Vertragspartner möglich.

---Text aus QA mit Infos zur Beauftragung durch FU---

Hier finden Sie die aktuelle Arbeitsanweisung: Link

Ihr KERN DAkkS-Team