ISO/TC 92/SC 1/WG 10 - Specifications for measuring devices and instruments used in fire tests and methodologies of analysis

This document specifies a measuring system that enables the determination of the transmittance and the optical density of smoke emission tests under laboratory conditions. This document also provides the calibration method for the system. This document is an English-language version of DIN 50055, with minor editorial modifications.

This document specifies methodologies for comparing the smoke density and the smoke production rate during fire tests measured by LED (light-emitting diode) with those measured by white light. These methodologies are intended for the identification of suitable LEDs which can be used as alternatives to white light sources.

ISO 14934-4:2014 provides guidance on the use of heat flux meters in fire testing applications, including the description and working principles of common heat flux meters and methods for their selection and maintenance. The guidance can also be applied to measuring heat flux from radiant panels and other large heat sources used to simulate the heat flux from a fire. It is applicable for all common testing purposes when measuring heat flux from radiant sources. ISO 14934-4:2014 also provides basic theory and working principles of heat flux meters and methods for selection, use, and maintenance of heat flux meters. Although it is particularly aimed at the application of heat flux meters in fire tests and experimental works of fire research, it can also serve as a guide for other research applications like research of boilers, combustion processes, etc. Instruments, which measure the transient temperature of a solid body of known mass and heat capacity to infer the heat flux (slug calorimeter type), are not covered by ISO 14934-4:2014.

ISO 14934-2:2013 describes three methods for calibration of total hemispherical radiometers and total heat flux meters that are exposed to a well-defined radiation from a radiant heat source. The equipment is designed to minimize influences due to convective heat transfer during calibration. It is important to note that when the instruments are used in practice they measure a combination of radiant and convective heat transfers. The latter will depend on the design of the heat flux meter, the orientation, local temperature and flow conditions, and on the temperature of the cooling water.

1 Scope This part of ISO 14934 specifies methods for the calibration of heat flux meters for use in fire testing. The methods apply only to instruments having plane receivers. They do not apply to receivers in the form of wires, spheres, etc.

ISO 14934-1:2010 specifies the terms and definitions for the calibration and use of heat flux meters. It also describes the relationship between output voltage and total heat flux, and gives uncertainty components that are relevant for the calibration and use of heat flux meters.

ISO 14934-2:2006 describes three methods for calibration of total hemispherical radiometers and total heat flux meters that are exposed to a well-defined radiation from a radiant heat source. The equipment is designed to minimize influences due to convective heat transfer during calibration. It is important to note that when the instruments are used in practice they measure a combination of radiant and convective heat transfers. The latter will depend on the design of the heat flux meter, the orientation, local temperature and flow conditions, and on the temperature of the cooling water.

ISO/TS 14934-1:2002 gives guidelines for calibration and use of radiometers and heat flux meters in fire testing and for correction of the sensitivity function due to convection effects. It briefly describes the calibration methods, the most commonly used types of radiometers and heat flux meters, and the fire tests in which these transducers are used. ISO/TS 14934-1:2002 is applicable to total hemispherical radiometers, total heat flux meters of Schmidt-Boelter (thermopile) and Gardon (foil) type. It applies only to instruments having plane receivers and does not apply to receivers in the form of wires, spheres, etc.