The principle operating components of the mask are, a head harness, facepiece assembly, eye lens, front module assembly, filters and drink tube coupler and housing. Each facepiece has two filter mouths positioned on the left and right which is on either side of the mask. Each filter mount integrates a self-sealing disk valve, an inlet disk valve, the valve mounting posts, and valve seats and air deflectors. The flow of air throughout the mask is controlled by the air deflectors and nose cup and the filters are attached to the filter mount via twist and turn lock mechanism.
Mask Sizing and Fitting Procedures:
The M50 gas mask is available in three sizes. We recommend you get initial styling and testing done by trained personnel. Around 80% of people use the medium size of the mask and the small size is hardly used, but still, you need to do a fit test to understand the right size of the mask.
Here are a few tips to remember while selecting the mask size for you;
- In a correct sized mask, the eyes of the operator will be slightly above the horizontal centerline of the lens.
- The mask should make a firm along the entire length of the face to create the perfect seal.
- Distance between the mask edge and ear should be in the range of 0.5 to 1.5 inches (12mm to 37.5mm).
- If the mask is too small for the operator, then the seal protection may fail to perform, and the mask will be uncomfortable to wear.
- If the mask is too large, then the operator may lose protection and performance as the mask fits lose hence it may slip.
Whenever you use the mask, you need to inspect the mask thoroughly for any damage or fitting issues.
- Check if the mask is fitted with the appropriate filters to ensure that the filters have been correctly attached.
- Ensure that the size of the mask is correct for you to obtain optimal fitting.
- Check the mask for any wear or cuts visible to the eyes.
- Check the eyepiece of the mask for any cracks or breaks and clean it for clear vision.
- Check all the strap lengths as per what fits you best prior to wearing the mask.
M50 gas Mask Negative Pressure Check:
To check if the mask fits you right and a perfect seal has been obtained every time you use the mask, do a negative pressure test to confirm this;
- Place your palm over the front cover module to block it and blow out hard to force out any contaminated air around the edges of the mask.
- Use your palm to cover both primary filters and breathe in, the mask will collapse against your face and remain so for a while till you hold your breath. If this happens, then the mask is ok.
- If the mask does not collapse properly, then check it for leaks as the proper seal has not been obtained. If needed, get the mask replaced.
Cleaning Procedures for M50 Gas Mask:
Cleaning the M50 gas mask is vital for long term effectiveness and in providing the best protection in a hazardous environment. The cleaning and inspection should be done regularly as a part of the regular maintenance and after each use;
- Remove these components prior to cleaning- head harness, primary filters, self-sealing disk valves, air deflectors, front module cover assembly and inlet, and outlet valves.
- Remove these extra accessories if attached to the mask- vision correction assembly, communications lead, microphone assembly, voice projection unit and protective hood.
- Remove the drink coupler from its housing and from around the front module assembly.
- Immerse the mask in warm water and a mild soap solution, then agitate the mask in solution to clean it properly and then remove the mask from the solution.
- Now, immerse the mask in clean water to remove all traces of the soap solution and dry the mask. Finally wipe it with a soft, clean and lint-free cloth especially under the main seal of the mask.
- Replace the mask components and store the M50 gas mask carefully. Your mask is ready for use now.
Warnings and Cautions:
- The primary filters that come along with the mask can only be used with this mask. The filters will not seal on other masks which may lead to serious health injury or death.
- The primary filters need to be installed prior to fitting the mask or else the operator will not be able to breathe if both the filters are removed from the half gas mask.
- Proper formal training is needed before using the mask to understand the safe installation and mask-wearing procedures along with cleaning and inspecting the mask.
- The person using the mask should first read the entire mask manual and instructions prior to use.
- Sizing of the mask is important, hence preferably get it done by a trained technician to get the best protection.
- This mask cannot be used in an enclosed place where the oxygen is deficient.
- Maintain and clean the mask regularly to increase its life so that the mask can provide maximum protection while using it.
- Choose the right mask size by conducting a fit-test so that the mask seals perfectly to be safe in a hazardous environment.
- Wear and take off the mask in an environment that is free of contaminants.
- Perform a negative pressure test to check for any leaks before you enter the contamination area.
- Clean shave your face to achieve a perfect seal.
- Do not wear contact lenses when wearing the mask as inadequate oxygen supply to corneal surface or exposure to dust smoke and chemicals can damage your vision.
- Do not use abrasive or solvent cleaners to clean the mask as it may damage it.
At last, do not forget to check for NIOSH (National Institute for Occupational Safety and Health) certification before you buy the M50 gas mask as they set the standards for approved M50 and M40 gas masks for professionals in the U.S