5
Replacing the exhalation valve
•Pull the valve cover from the valve and remove the disc.
•Insert a new disc ensuring that it lies flat on the seat.
•Align the valve cover with the slots and snap it in its place.
Replacing the pivot arms
•Use side clip to release pivot arm and withdraw arm from pivot post. Slide new pivot arm into pivot post and secure with side clip.
Replacing the brim trim
•Release the elastic loops from the head harness. Untie the retaining cord of the old brim trim and remove it from the helmet.
•Locate the rectangular slots in the new brim trim over the airducts at the front of the helmet, arrange the brim trim around the brim of the helmet with the sponge pads tucked under the helmet brim. Tie the retaining cord.
Replacing the head harness
•Tilt the visor to the
•When mounting, insert the white retaining tabs into the slots in the rim of the helmet, and press down until they clik into place.
•Tilt the visor to the required position.
Replacing the sweatband
•Pull the old sweatband from the head harness hooks.
•Fit the new sweatband onto the four hooks in the lower front of the headband, fold across the headband, then clip on to the two hooks at the top of the headband.
5.Selection of
Type of protective device |
| APF |
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| Remarks, limitations | ||
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| (Assigned protection factor) |
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| Values as given |
| Values as given |
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| in BS 4275 |
| in German BGR |
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| 190 - ZH1/701 |
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| “Open” facepieces, such as helmets |
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particle filter |
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| or hoods, do not provide sufficient |
TH1P | 10 | 5 |
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| protection in case of breakdown or | ||
TH2P (Flowhood 5) | 20 | 20 |
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| inferior output of the blower. | ||
TH3P | 40 | 100 |
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| Therefore, devices of class TH1 must | ||
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| never be used against carcinogenic, |
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| very poisonous or radioactive gases |
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| and vapours. |
Device with combined filter | The specified multiples of threshold value for the gas or particle filters are | ||||||
| given separately, but in all cases the lowest value applies. | ||||||
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| For devices with combined filter apply | |
gas filter *) |
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| the relevant limitations of gas and |
TH1 gas filter class 1 or 2 | 10 | 5 |
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| particle filters. | ||
TH2 gas filter class 1 or 2 | 20 | 20 |
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TH3 gas filter class 1 or 2 | 40 | 100 |
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*) Provided that the maximum permissible detrimental gas concentration for the gas filter is not exceeded. For