5. A person shall not use a beltweigher for trade—
(a)except for the purpose of measuring quantities of material the values of which expressed in units of measurement of mass are not less than the value of the minimum totalised load;
(b)for a purpose other than a purpose specified in the certificate of approval relating to it;
(c)otherwise than in conformity with any mark placed on it in conformity with these Regulations; or
(d)in the case of a Class 2 beltweigher, for the purpose of weighing any material other than ballast, that is to say, any of the materials to which the expression “ballast” applies in Schedule 4 to the 1981 Order.