Spark test apparatus

Different values for the minimum ignition energy are obtained in low voltage circuits with an ohmic (R) and inductive (L) load. As a switching element, a spark test apparatus with counter-rotating tungsten wires and a cadmium... [Pg.18]

Part 3 Spark test apparatus for intrinsically safe circuits... [Pg.87]

Table 6.38 Reference gas-air mixtures to be used in the spark test apparatus (at T = 293 K and p = 1.013 105Pa)...

So, in a research project, PTB Physikalisch-Technische Bundesanstalt, Germany, has investigated the influence of real cables on spark ignition theoretically and in practical trials using the spark test apparatus. ... [Pg.411]

Spark test apparatus applied to intrinsically safe electrical circuits. [Pg.433]

The shafts shall be tightened when entering the explosion chamber (1). This chamber shall withstand an explosion pressure of 1.5 MPa (=15 bar). Figure 8.12 shows a longitudinal section drawing of the spark test apparatus and Fig. 8.13 this apparatus in its entirety (cover of explosion chamber removed, however). [Pg.451]

Due to its construction, there are some limitations for the spark test apparatus ... [Pg.451]

The spark test apparatus must not influence the circuit to be tested, e.g. the circuit inductance must not be increased by the apparatus inductance. So, the parameters of the apparatus are ... [Pg.451]

Figure 8.11 Spark test apparatus. Functional scheme. Dimensions are given in mm.

With this spark test apparatus, the reference curves (minimum ignition curves) of Figs 6.162 to 6.167 (showing price ratio ex-protected to non-ex-protected cage induction motors versus rated power types of protection -(E) Ex e IIT3 (E) Ex d IIC T4 and (E) Ex d IIB T4) have been established with reference gas-air mixtures according to Table 6.38. [Pg.452]

In practice, simple circuits may be assessed with respect to the reference curves, i.e. there is no need to apply the spark test apparatus. However, more... [Pg.452]

Figure 8.12 Spark test apparatus longitudinal section drawing, according to EN 50020 and IEC 60079-11.

The spark test apparatus shall be inserted in the circuit under test at each point where it is considered that an interruption or interconnection may occur. Tests shall be made with the circuit in normal operation, and also with one or two faults, as appropriate to the category of electrical apparatus..., and with the maximum values of the external capacitance (C0) and inductance (L0) or inductance to resistance ratio (LJR0) for which the apparatus is designed. [Pg.453]

Fig u re 8.13 Spark test apparatus, total view (cover of explosion chamber removed). [Pg.454]

When using the spark test apparatus, the safety factor of 1.5 (if required) shall be obtained by one of the following methods ... [Pg.454]

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