VDI VDE 3513 Blatt-2 1978-12 PDF

Full title and description

STB VDI VDE 3513 Blatt-2 1978-12 — Schwebekörper‑Durchflußmesser; Genauigkeitsklassen (English title: Variable‑area flowmeters; accuracy). This is the original VDI/VDE guideline (Blatt 2) from December 1978 that defines accuracy classes and maximum permissible errors for variable‑area (float/rotameter) flowmeters. Some document distributors list the item with an "STB" prefix in their catalogs (vendor/product catalogue notation), but the underlying technical document is the VDI/VDE guideline published in 1978.

Abstract

The guideline specifies accuracy classes and the method for determining maximum permissible errors (error limits) for variable‑area flowmeters. It covers the definition of terms, how to determine the maximum permissible error G of the measuring system, influences affecting error (especially in the lower measuring range), and documentation requirements; an annex provides example records. This 1978 Blatt‑2 edition has since been withdrawn and replaced by a later revision (VDI/VDE 3513 Blatt 2:2008‑08).

General information

• Status: Withdrawn / superseded (replaced by VDI/VDE 3513 Blatt 2:2008‑08).
• Publication date: 1978‑12 (catalog listings show 1 December 1978 as the publication reference).
• Publisher: Verlag des Vereins Deutscher Ingenieure (VDI/VDE - Mess‑ und Automatisierungstechnik).
• ICS / categories: 17.120.10 (Flow in closed conduits / flowmeters).
• Edition / version: Blatt 2 — original edition 1978‑12.
• Number of pages: 4 pages (original German pamphlet).

Scope

Applies to variable‑area flowmeters of all designs and establishes how to classify their accuracy and state maximum permissible errors of the device (error limits G). The document treats special behaviour of variable‑area meters (nonlinearity toward the lower scale, float dynamics and friction), prescribes how to determine and document the maximum permissible error over the measuring range, and notes separate consideration for electrical outputs where applicable. The 1978 version focused on accuracy classes and basic documentation; later revisions extended the method and reporting formats.

Key topics and requirements

• Definitions and terminology for variable‑area (float) flowmeters (Schwebekörperdurchflussmesser).
• Determination method for maximum permissible errors (error limits G) of the measuring system.
• Consideration of additional influences on accuracy (lower range effects, restoring forces, friction, float instability).
• Documentation requirements and example recording formats (annex with example records).
• Notation about electrical outputs of a measuring system and whether their errors are included or must be stated separately.

Typical use and users

Used by instrument manufacturers, calibration and metrology laboratories, process engineers, plant designers and procurement/specification engineers who need to rate or specify variable‑area flowmeters (rotameters) by accuracy class and permissible error. Also used as a reference for conformity checks, factory calibration, and product documentation until superseded by later revisions.

Related standards

Part of the VDI/VDE 3513 series: VDI/VDE 3513 Blatt 1 (calculation methods, later editions) and Blatt 3 (selection and installation recommendations) are closely related; the 1978 Blatt 2 was replaced by the 2008‑08 revision of Blatt 2 which consolidates updates and adds digital annex material. Other referenced documents in later catalogs include related VDI rules on measurement and documentation practice.

Keywords

variable‑area flowmeter, rotameter, Schwebekörperdurchflussmesser, accuracy classes, maximum permissible error, Fehlergrenzen G, calibration, VDI/VDE 3513 Blatt 2, 1978‑12.

FAQ

Q: What is this standard?

A: VDI/VDE 3513 Blatt 2 (1978‑12) is a VDI/VDE guideline that defines accuracy classes and the method to determine maximum permissible errors for variable‑area (float) flowmeters.

Q: What does it cover?

A: It covers terminology, methods to determine maximum permissible error G of the device, influences on accuracy (especially at the lower measuring range), documentation requirements and example records.

Q: Who typically uses it?

A: Instrument manufacturers, calibration/metrology labs, process and plant engineers, and specifications/procurement teams—anyone who selects, tests, documents or certifies variable‑area flowmeters.

Q: Is it current or superseded?

A: The 1978 Blatt 2 edition is withdrawn/superseded; it was replaced by VDI/VDE 3513 Blatt 2:2008‑08 (the 2008 revision is the current replacement document). For new work or current requirements, consult the 2008 (and any later) edition(s).

Q: Is it part of a series?

A: Yes — it is Blatt (Part) 2 of the VDI/VDE 3513 series on variable‑area flowmeters; other parts (e.g., Blatt 1 and Blatt 3) cover calculation methods and selection/installation guidance.

Q: What are the key keywords?

A: Variable‑area flowmeter, Schwebekörperdurchflussmesser, accuracy classes, maximum permissible error G, calibration, VDI/VDE 3513.