2 a) Introduction
The headset AK5850S is made for use in noisy areas. It can be used together with helmet (AK5850S, helmet
attachment) or without helmet (AK5850HS, headband). To achieve the best attenuation it is recommended to
use the AK5850S/AK5850HS together with the Offshore ear plug. The hearing protection shall be worn at all
times in noisy environments. The headset is made of metal and ABS. The parts in contact with the skin (ear
cushions) are made of polyvinylchloride. Warning: If the recommendations in this user manual is not adhered
to, the protection of this PPE may be severly impaired!
2 b) How to adjust the headset before use
The headset shall be fitted and adjusted according to the manual to achieve maximum protection. Use of
glasses, beard or other items that can course leakage between the skin and the ear cushions may impair the
attenuation.
Place the helmet attachment (1) into the slots on the helmet and put the helmet on to your head. The helmets
approved for use is Peltor G22C/D, OBX and Balance AC. The headband version can be put directly over the
top of your head.
Adjust the adjustable steel rods (6) up and down until the cups are perfectly covering your ears.
Warning: These ear-muffs are of large size range. Ear-muffs complying with EN 352-1 are of “medium size
range” or “small size range” or “large size range”. “Medium size range” ear-muffs will fit the majority of
wearers. “Small size range” or “large size range” ear-muffs are designed to fit wearers for whom “medium size
range” ear-muffs are not suitable.
The cups can be set in rest position by pulling them straight out from the ears. This shall only be done in areas
without noise since it will be a gap between the earmuffs and the ears. The normal position can be maintained
by pressing the cups back again towards the ears.
Adjust the microphone (3) to a position straight in front of the mouth. The distance shall not exceed 15 mm. to
achieve the optimal noise attenuation.
2 c) How to connect the headset to a radio
The headset can be connected to a 2-way radio by connecting the connector (4) into a PTT-unit made for the
different radios. The headset cannot be connected directly to the radio. Ask your supplier for the right PTT-unit
made for each radio brand. This headset is provided with electrical audio input. Check correct operation before
use. Warning: Do not connect or disconnect the device to the PTT unit or turn on/off the radio while the
equipment is placed over the ears. It is also important that the interconnecting cord is not damaged. Shortcuts
ore other disturbance may course high noise that can damage the hearing. The electrical audio output of this
hearing protector may exceed the daily limit sound level. When the earmuffs AK5850S / AK5850HS is used
alone the electric input level for which the mean plus one standard deviation A-weighted diffuse-field related
sound pressure level is equal to 82 dB is at voltage U = 208 mV. Be careful with the volume control!
2 d) How to connect the headset to the Offshore Ear Plug
Connect the 3,5 mm. jack plug on the Offshore ear plug into the 3,5 inlet on the left cup.
This shall be done before that the Offshore ear plug is placed into the ears.
2 e) Maintenance and storage
This product can deteriorate with use and shall regularly be inspected for serviceability. The headset shall be
kept clean and free of damage. Otherwise the attenuation can be poor. This product may adversely be
affected by certain chemicals. The headset can be cleaned by ordinary soap and water and can be disinfected
with alcohol or clorhexidine.
Avoid liquids into the headsets foam parts. The headset can be used and stored in temperatures between
-30oCto + 60oC. Keep the headset stored in a temperate and dry place.
Hygienic kits (Article no. AK5851, included foam parts and cushions) and other spare parts can be ordered
from your supplier or directly from the factory. The hygienic kits are easy to replace. No tooling is required.
Just grab the snap old ear cushion from inside by your fingers and snap it out. Replace the outer foam plate
with the new one and push the new ear cushion back in place by hand force. The fitting of the ear cushions
may affect the acoustic performance and you shall hear a click when it is in the right position. It shall be no
gap between the cushions and the headset cups. Ear-muffs, and in particular cushions, may deteriorate with
use and should be examined at frequent intervals for cracking and leakage, for example. The fitting of
hygienic covers to the cushions may affect the acoustic performance of the earmuffs.
