BS EN 12331:2021 pdf download.Food processing machinery — Mincing machines — Safety and hygiene requirements.
4 Safety requirements and/or measures
4.1 General Machinery shall comply with the safety requirements and/or protective measures of this clause. In addition, the machine shall be designed according to the principles of EN ISO 12100:2010 for relevant, but not significant hazards which are not dealt with by this document.
Where the means of reducing the risk is by the arrangement or positioning of the installed machine, the manufacturer shall include in the Information for use a reference to the reduction means to be provided, and to any limiting value of the requirement, and, if appropriate, to the means of verification.
Where the means of reducing the risk is by a safe system of work, the manufacturer shall include in the information for use details of the system and of the elements of training required by the operating personnel.
Machine safety functions are implemented and assured through Safety-Related Parts of the Control System (SRP/CS) that shall achieve a required Performance Level (PL r ). This requirement is given for each safety function in the relevant subclauses of Clause 4. Table C.1 summarizes PL r for each safety function; however, the provisions of Clause 4 remain the sole and complete normative set of requirements and explanations.
In addition, interlocking systems shall be designed to comply with the following features:
— fulfil hygienic requirements;
— protected against mechanical damages;
— protected against the effects of cleaning and disinfecting materials;
— protected against the effects of cleaning fluids (water);
— not be easy to by-pass or render non-operational;
— be contained in the machine casing and comply with EN ISO 14119:2013, 7.2 a) 1).
4.2.2 Zone 1 – Requirements for machines with feed intake and worm
Access to the worm in the feed intake shall be prevented, e.g. by the following measures:
1) On machines with diameter of feed intake D ≤ 52 mm (see Figure 3), the distance L between the upper feed intake edge and the worm shall be:
a) L ≥ 100 mm on machines with diameter of feed intake D ≤ 46 mm;
b) L ≥ 120 mm on machines with diameter of feed intake 46 mm < D ≤ 52 mm.
2) On machines with a diameter of feed intake D > 52mm, a restrictor plate (see Figure 4) shall be
provided by the following measures:
a) the restrictor plate shall be provided with an interlocking device unless it is permanentally fixed
(e.g. by welding; a fixation by means of screws is not regarded as permanent);
b) when a force between the mass of the machine and ≤ 150 N is applied in any position and any
direction on the restrictor plate, the restrictor plate shall not permanentally raise the distance S
more than 2 mm if the requirements of Table 1 are met;
c) the inlet of the restrictor plate shall have a diameter C ≤ 52 mm;
d) the horizontal distance from outer edge of restrictor plate to feed intake edge shall be E ≥ 40 mm;
e) the dimensions S, L, L 1 and L 2 and the arrangement of the restrictor plate shall be in accordance with Figure 4 and Table 1;BS EN 12331 pdf download.