Physikalisch-Technische Bundesanstalt
Open Access Repository of the Physikalisch-Technische Bundesanstalt (PTB-OAR)Not a member yet
1101 research outputs found
Sort by
Calibration of dew point hygrometers with gas temperature measurement for relative humidity : Expert report DKD-E 5-2
No full textThe aim of this expert report is to outline the technical conditions for the calibration of dew point hygrometers with connected temperature sensors with regard to the measurand relative humidity and thus to create a uniform approach among calibration laboratories, technical assessors and users. All symbols and formula symbols are used in analogy to the definition in DKD-R 5-8:2019. This expert report addresses accredited calibration laboratories or calibration laboratories in the process of accreditation. It can also be used by other calibration laboratories
Liste der bei der PTB angezeigten und geprüften Schusswaffen gemäß § 9 Abs. 2 Nr. 1 Beschussgesetz (BeschG) bis lfd. Nr. 6099
No full textListe der bei der PTB angezeigten und geprüften Schusswaffen gemäß § 9 Abs. 2 Nr. 1 Beschussgesetz (BeschG
Liste der bei der PTB angezeigten Marken und Herstellerzeichen gemäß § 24 Abs. 6 Waffengesetz (WaffG)
No full textListe der bei der PTB angezeigten Marken und Herstellerzeichen gemäß § 24 Abs. 6 Waffengesetz (WaffG
Kalibrierung von Taupunktspiegel- Hygrometern mit Gastemperaturmessung auf relative Feuchte : Expertenbericht DKD-E 5-2
No full textZiel des vorliegenden Expertenberichtes ist es, die fachlichen Randbedingungen für die Kalibrierung von Taupunktspiegel-Hygrometern mit angeschlossenen Temperatursensoren auf die Messgröße relative Feuchte zu erläutern und so eine einheitliche Sichtweise unter den Kalibrierlaboratorien, Fachbegutachtenden und Anwendenden zu schaffen. Alle Symbole und Formelzeichen werden analog zur Definition in der DKD-R 5-8:2019 verwendet. Dieser Expertenbericht bezieht sich auf akkreditierte oder im Akkreditierungsverfahren befindliche Kalibrierlaboratorien. Er kann auch von anderen Kalibrierlaboratorien verwendet werden
Progress and achievements of EURAMET project 21GRD09 MetroPOEM (Poster)
No full textThe European Green Deal’s ambition for zero pollution requires development of highly sensitive techniques to detect ultra-low amounts of pollutants and determine their isotope ratios, where mass spectrometry is a key method. The project bridges the traceability gap between activity and mass measurements – particularly estimation of mass bias – and establishes new tools for pollutant tracing. SI-traceable reference materials and measurement procedures are being developed that significantly reduce measurement uncertainty and detection limits, to enable tracking pollution sources by commonly available mass spectrometers. This project supports strategies described by the European Metrology Network on pollution monitoring and the established EMN on radiation protection. Main areas of work are:
• Development of low-level radionuclide standards for 90Sr and a series of actinides,
• Development of SI traceable high-precision analytical methods for isotope ratio determination of Li, B, Cr, Cd, Ni, Sb, Pb, and U in environmental matrices applicable to single and multi-collector ICP-MS systems.
• Generation of two reference materials – seawater and silica – spiked with radionuclides
• Production of certified seawater reference material for isotope ratio to validate analytical methods, support proficiency testing, and ensure quality control in future monitoring.
• Communication of project outcomes include peer reviewed papers, good practice guides, workshops, conference presentations and more
D7: Report describing the development of one aqueous certified reference material that is certified for the same stable isotope ratios of B, Cd, Li, Ni, Pb and U with lowest possible uncertainties
No full textThis report is intended to be the 7th deliverable report of the project 21GRD09 MetroPOEM describing the production of UME MetroPOEM CRM, a seawater material certified for the isotope amount ratios of selected elements: B, Cd, Li, Ni, Pb and U. The certified reference material was produced in accordance with the requirements of ISO 17034:2016 standard [1]. The collection of starting material, 250 L of seawater, was conducted at the station UE67, which was located at the edge of German EEZ in the North Sea (55° 25’ N; 4° 5’ E). The sample was filtered before filling into pre-cleaned 25 L HDPE carboys and acidified using subboiled HNO3 for the stabilisation. The carboys were sealed and individually packed in clean PE foil, and stored at 4 °C prior to transport to TÜBİTAK UME by Hereon for further processing. After preliminary analysis, the material was spiked with the elements whose mass fractions were below the target levels to obtain the material having suitable concentrations to be measured in standard analytical laboratories. After filling into pre-cleaned 250 mL polypropylene bottles, the whole batch was sterilized with 25 kGy -radiation by 60Co source. Between-unit homogeneity and stability during dispatch and storage conditions were assessed in accordance with ISO 33405:2024 standard [2] by 21GRD09 MetroPOEM Project [3] partners in a collaborative manner. The characterisation was conducted by an interlaboratory study where, in addition to the project partners, several expert laboratories were also involved in isotope ratio measurements. Uncertainties of the characterisation measurements were estimated in compliance with the Guide to the Expression of Uncertainty in Measurement (GUM) [4]. Certified values include uncertainties arising from possible inhomogeneity, instability and characterisation measurements. The material is intended to be used for calibration or quality control purposes in laboratories performing isotope ratio measurements
Liste der bei der PTB angezeigten Marken und Herstellerzeichen gemäß § 24 Abs. 6 Waffengesetz (WaffG)
No full textListe der bei der PTB angezeigten Marken und Herstellerzeichen gemäß § 24 Abs. 6 Waffengesetz (WaffG
Fractionation of Methane Isotopologues during Preparation for Analysis from Ambient Air
No full textPreconcentration of methane (CH4) from air is a critical sampling step in the measurement of singly and doubly substituted isotopologue ratios. We demonstrate the potential for isotope fractionation during preconcentration onto and elution from the common trapping material HayeSep-D and investigate its significance in laser spectroscopy measurements. By altering the trapping temperature for adsorption, the flow direction of CH4 through the trap and the time at which CH4 is eluted during a desorption temperature ramp, we explain the mechanisms behind fractionation affecting δ13C(CH4) and δ2H(CH4). The results highlight that carbon isotope fractionation is driven by advection and diffusion, while hydrogen isotope fractionation is driven by the interaction of CH4 with the adsorbing material (tending to smaller isotopic effects at higher temperatures). We have compared the difference between the measured isotope ratio of sample gases (compressed whole air and a synthetic mixture of CH4 at ambient amount fraction in an N2 matrix) and their known isotopic composition. An open-system Rayleigh model is used to quantify the magnitude of isotopic fractionation affecting measured δ13C(CH4) and δ2H(CH4), which can be used to calculate the possible magnitude of isotopic fractionation given the recovery percentage. These results provide a quantitative understanding of isotopic fractionation during the sample preparation of CH4 from ambient air. The results also provide valuable insights applicable to other cryogenic preconcentration systems, such as those for measurements that probe the distribution of rarer isotopologues
Technische Richtlinien. Messgeräte für thermische Energie. K 8 „Auswahl und Einbau von Temperaturfühlern für Messgeräte thermischer Energie (Wärme- und Kältezähler)“. Ausgabe Oktober 2025
No full textDiese Richtlinien gelten für den Anwendungsbereich der Wärme- und Kältemessung im geschäftlichen und amtlichen Verkehr. Für die Messung thermischer Energie werden Temperaturfühlerpaare als Teilgeräte des Wärme- oder Kältezählers eingesetzt. Um eine einwandfreie Funktion der Messgeräte zu gewährleisten ist es erforderlich, die Installation durch qualifiziertes Personal anhand der Hinweise und Anforderungen gemäß dieser Richtlinie vorzunehmen.
Die Richtlinien wurden von der PTB unter Beteiligung der betroffenen Kreise erstellt.
Diese Technischen Richtlinien (TR) sind eine Überarbeitung der bisherigen TR-K 8 mit Ausgabestand 03/18 und ersetzen diese
Liste der von der PTB erteilten Bauartzulassungen nach § 7 Beschussgesetz (BeschG)
No full textListe der von der PTB erteilten Bauartzulassungen nach § 7 Beschussgesetz (BeschG