ProMinent Beta BT4b Operating Instructions Manual page 13

Safety chapter
An instructed person is deemed to be a person who has been instructed
and, if required, trained in the tasks assigned to him/her and possible dan‐
gers that could result from improper behaviour, as well as having been
instructed in the required protective equipment and protective measures.
Service
Customer Service department refers to service technicians, who have
received proven training and have been authorised by ProMinent or Pro‐
Maqua to work on the system.
Sound pressure level Sound pressure level LpA < 70 dB in accordance with EN ISO
20361:2010-10
at maximum stroke length, maximum stroke rate, maximum back pressure
(water)
13