Overview
EN ISO 13225:2012 - Geometrical product specifications (GPS) - specifies the essential design and metrological characteristics of height gauges used for linear-dimensional measurements perpendicular to a surface plate. It applies to height gauges with analogue (vernier, circular) or digital indication and covers both manual and motorized slider designs. The standard promotes clear manufacturer–purchaser relationships and effective management of measuring instruments within quality systems.
Key topics and requirements
- Scope and definitions
- Precise definition of a height gauge and related terms (measuring-face contact, full/partial contact).
- Design characteristics
- Required manufacturer information for main dimensions (e.g., base width W, base depth D, overall height H, measuring range L, probe extension P, stylus length limits Mmin / Mmax).
- Typical design features: instrument base and base reference plane, beam, slider, guiding face, fine-adjustment, locking devices, probe extension, measuring/scribing stylus.
- Options such as air bearing systems, fixing devices, fine adjustment and protection levels (IP code).
- Indicating device types
- Support for analogue (vernier, circular) and digital displays; labelling requirements for scale intervals and units.
- Metrological characteristics
- Definition and specification of characteristics limited by maximum permissible errors (MPE), operating conditions, and the effect of slider locking on measurement accuracy.
- Conformance and calibration
- Requirements and guidance for proving conformance, relevant measurement standards used in calibration, and marking.
- Informative annexes
- Error tests, example data sheet, calibration advice, and relation to the GPS matrix model.
Practical applications and users
EN ISO 13225:2012 is intended for:
- Manufacturers of height gauges - to design and declare metrological performance and main dimensions.
- Purchasers and procurement teams - to specify product requirements and compare instruments.
- Calibration laboratories and metrology departments - to calibrate, test, and prove conformance to declared characteristics.
- Quality managers and production engineers - to integrate height gauge management into QA systems and ensure reliable dimensional inspection on surface plates.
Practical uses include selection of suitable height gauges for shop-floor inspection, preparation of calibration certificates, defining environmental/operating conditions, and determining measurement uncertainty for inspections.
Related standards
Key normative references and related GPS documents:
Keywords: EN ISO 13225:2012, height gauges, geometrical product specifications, GPS, dimensional measuring equipment, metrological characteristics, design characteristics, calibration, surface plate.