Wood’s Powr-Grip MRT49DC2 - Manual (Page 18)

Rev 0.5/4-14 16 MRT4-DC2: #35071
Make sure alarm is clearly audible over ambient noise at operator position.
A low vacuum/power loss warning buzzer sounds an
audible alarm in the case of these potentially
dangerous situations. Rotate the shutter as shown
to adjust the alarm volume. Make sure the alarm
can be heard over ambient noise in the work area.
The alarm must be clearly audible at the maximum
distance between the operator and the lifter, despite
any intervening barriers or obstructions.
In order to be considered clearly audible,
the alarm
volume must exceed ambient noise by at least
15 dBA at the operator position. 7 Since the
Maximum Alarm Volume is 103 dBA at 2 ft [60 cm],
ambient noise must not exceed 88 dBA under any
circumstances.
8
7
Consult CE Standard EN 457 for alternative ways to determine whether the alarm is clearly audible to operators.
8
Furthermore, if ambient noise measures 88 dBA, the alarm volume must be set to maximum and the operator must remain
within 2 ft [60 cm] of the warning buzzer, in order for it to be effective.