Legal metrology is the science of measurement. It is very important for trade and our everyday lives. No market can function without correct measuring and without common units of measurement.
European Commission Website, 09.09.2021
Our wide range
|Measured Variable||Technology standard||Temperature range||Flow range|
|Volume of water||Balance(s)||0,1 °C – 90 °C||0,006 m³/ h – 1.600 m³/h|
|Piston||0,1 °C – 50 °C||0,001 m³/h - 10 m³/h|
|Combined balance / piston||0,1 °C – 50 °C||0,001 m³/h - 25 m³/h|
|Combined balance / mag meter||0,1 °C – 50 °C||0,010 m³/h - 1200 m³/h|
|Temperature sensor||Bath||0 °C – 150 °C||-|
|Energy calculator||High precision resistances||2 K - 195 K||-|
Number of Testbenches: 61 / Test Equipment: 20 (as of 2022)
The test equipment is accredited according to international and national regulations.
|European Measurement Equipment Directive Modul D||Ansbach, Apolda, Bazanowice, Jinan, Saint-Louis|
|ISO 17025||Ansbach, Saint-Louis|
|National state accredited laboratory||Ansbach, Apolda, Vienna, Saint-Louis|
Our laboratories are recognized in many countries and we have good contacts to other laboratories all over the world.
Our associations and alliances managers know the world of legal metrology and the key players in this domain.
Get in contact with our sales representant for inquiries.
State-approved test centre
Our independent state authorized laboratories exercise public functions under the supervision of the state metrology authority.
The usage of utility meters in the field is defined by national regulations. You can find some further information for Germany here:
We can proof our competence and our calibration laboratory is accredited according ISO 17025.
Factory test centre
We provide independent metrology inspections for our DIEHL products. Field returns pass our laboratory for metrological analysis.
Re-verification by sampling water meter
Legal meter evaluation water meter
Legal meter evaluation thermal energy meter
For official examination water meter
Gebührensatz Befundprüfung Wasserzähler
For official examination thermal energy meter
Gebührensatz Befundprüfung Wärme-/Kältezähler
For calibration fees and conformity assessment
As a subject of corporate metrology, we are providing all required legal metrology activities connect with produced artides.
Our equipment and testing mesures are under regular control of national and international certification bodies.
Efforts for accreditation related to ISO 17025:2017 (initiated in 2021) will allow our internal laboratory to provide the highest services for internal and external customers.
As a subject of corporate metrology, we are providing all required legal metrology activities connect with produced articles.
Our equipment and testing measures are under regular control of national and international certification bodies.
Our Calibration laboratory is accredited according to NF EN ISO/IEC 17025 : 2017
Main documents linked to this activity:
- 17025 certificate with technical annex (see link to global and to Cofrac site)
Diehl Metering Saint-Louis is certified for Thermal Energy Meters Installations according to:
- Décret 2001-387 from 3rd May 2001 and decision from 21st December 2018
Arrêté du 3 septembre 2010
Mains documents linked to this activity:
- Identification mark SL68
- Newsletter "Verification of Thermal energy installations"
Calibration obligation for water meters, heat meters and cooling meters
Cold and hot water meters as well as heat meters and cooling meters and their sub-assemblies that are used in the course of business or are kept ready for use without special preparation must be calibrated/ conformity assessed.
Calibration / Conformity assessment
The water, heat and cooling meters are calibrated by the calibration authority or by authorized calibration laboratories.
Marking during calibration / conformity assessment
The water, heat and cooling meters are marked as calibrated by the calibration authority or the authorized calibration bodies by means of the main stamp or are conformity assessed in accordance with the recognized quality management system of the European MID Directive 2014/32/EU.
Prerequisites for verification/conformity assessment - Verifiability of measuring instruments
Measuring instruments that are to be calibrated must be of a type that has been approved for calibration. The characteristic of the type approval is the approval mark affixed to the measuring instrument, e.g. national approval, EEC approval or EC type examination certificate with registered marks and numbers.
The calibration/conformity assessment is not valid indefinitely. For cold and hot water meters, heat and cooling meters, the validity period is 5 years.
Cold and hot water meters, heat and cold meters: calibration period 5 years
Calibration 2017 - expiry of calibration 31.12.2022
This means that the water and heat meters must be recalibrated or replaced by validly calibrated meters by the end of these periods at the latest. There is no separate request for this. Utility companies have the option of extending the calibration validity by three or five years by means of a sampling procedure.
The validity expires prematurely if, among other things, the meter does not comply with the traffic error limits after calibration, e.g. due to the water quality, or if the main stamp or a security stamp has been damaged.