【Daily Question No. 296】October 29, 2018

(1) First, open the gas cylinder valve and check whether the pressure on the gauge is at least 250 bar； (2) Place the safety helmet on the side of the respirator, in a location that is easy to access ； (3) Turn the cylinder valve downward and attach it to the air respirator. First, tighten the shoulder straps, then tighten the waist belt so that the back support fits securely against the back ； (4) Pick up the safety helmet, put the straps around your neck, and then place the helmet at the back of your neck ； (5) Check the airtightness of the mask. The jaw fits into the recessed groove below the mask. Pull the head cover from the upper front part of the head downward to the back, put it on the head, adjust the position of the mask, tighten the neck strap at the bottom, and then tighten the three straps at the top until they are in the proper position. Cover the mask’s interface area with the palm of the hand, inhale until negative pressure is created, and check whether the seal between the mask and the face is good ； (6) After the airtightness test is completed, install the air supply valve on the mask; upon hearing a click, the air supply valve will open automatically ； (7) Put the safety helmet at the back of the neck on your head and tighten the straps ； (8) Wear the air respirator properly, and only after thoroughly checking it to ensure it is in good condition should it be used at the site. During use, pay attention to the alarm signals emitted by the alarm device (an alarm is triggered at 5 MP; the air respirator can be used for approximately 5–8 minutes from the moment the alarm sounds). Upon hearing the alarm signal, evacuate the area immediately; do not remove the mask of the air respirator until you have reached a safe location ； (9) After using the respirator, pinch the yellow buttons on both sides of the air supply valve with your hands to remove it, take off the mask, and then close the cylinder valve ； (10) Used gas cylinders should be refilled in a timely manner to reach the specified pressure. The mask and the air supply valve are kept separate and stored properly as required, to remain ready for use at all times.

(1) First, open the gas cylinder valve and check whether the pressure on the gauge is at least 250 bar； (2) Place the safety helmet on the side of the respirator, in a location that is easy to access ； (3) Turn the cylinder valve downward and attach it to the air respirator. First, tighten the shoulder straps, then tighten the waist belt so that the back support fits securely against the back ； (4) Pick up the safety helmet, put the straps around your neck, and then place the helmet at the back of your neck ； (5) Check the airtightness of the mask. The jaw fits into the recessed groove below the mask. Pull the head cover from the upper front part of the head downward to the back, put it on the head, adjust the position of the mask, tighten the neck strap at the bottom, and then tighten the three straps at the top until they are in the proper position. Cover the mask’s interface area with the palm of the hand, inhale until negative pressure is created, and check whether the seal between the mask and the face is good ； (6) After the airtightness test is completed, install the air supply valve on the mask; upon hearing a click, the air supply valve will open automatically ； (7) Put the safety helmet at the back of the neck on your head and tighten the straps ； (8) Wear the air respirator properly, and only after thoroughly checking it to ensure it is in good condition should it be used at the site. During use, pay attention to the alarm signals emitted by the alarm device (an alarm is triggered at 5 MP; the air respirator can be used for approximately 5–8 minutes from the moment the alarm sounds). Upon hearing the alarm signal, evacuate the area immediately; do not remove the mask of the air respirator until you have reached a safe location ； (9) After using the respirator, pinch the yellow buttons on both sides of the air supply valve with your hands to remove it, take off the mask, and then close the cylinder valve ； (10) Used gas cylinders should be refilled in a timely manner to reach the specified pressure. The mask and the air supply valve are kept separate and stored properly as required, to remain ready for use at all times.

(1) First, open the gas cylinder valve and check whether the pressure on the gauge is at least 250 bar； (2) Place the safety helmet on the side of the respirator, in a location that is easy to access ； (3) Turn the cylinder valve downward and attach it to the air respirator. First, tighten the shoulder straps, then tighten the waist belt so that the back support fits securely against the back ； (4) Pick up the safety helmet, put the straps around your neck, and then place the helmet at the back of your neck ； (5) Check the airtightness of the mask. The jaw fits into the recessed groove below the mask. Pull the head cover from the upper front part of the head downward to the back, put it on the head, adjust the position of the mask, tighten the neck strap at the bottom, and then tighten the three straps at the top until they are in the proper position. Cover the mask’s interface area with the palm of the hand, inhale until negative pressure is created, and check whether the seal between the mask and the face is good ； (6) After the airtightness test is completed, install the air supply valve on the mask; upon hearing a click, the air supply valve will open automatically ； (7) Put the safety helmet at the back of the neck on your head and tighten the straps ； (8) Wear the air respirator properly, and only after thoroughly checking it to ensure it is in good condition should it be used at the site. During use, pay attention to the alarm signals emitted by the alarm device (an alarm is triggered at 5 MP; the air respirator can be used for approximately 5–8 minutes from the moment the alarm sounds). Upon hearing the alarm signal, evacuate the area immediately; do not remove the mask of the air respirator until you have reached a safe location ； (9) After using the respirator, pinch the yellow buttons on both sides of the air supply valve with your hands to remove it, take off the mask, and then close the cylinder valve ； (10) Used gas cylinders should be refilled in a timely manner to reach the specified pressure. The mask and the air supply valve are kept separate and stored properly as required, to remain ready for use at all times.

Instructions for use: 1.1 Wearing steps 1.1.1 Check that the pointer on the pressure gauge of the gas cylinder is within the green range; ensure that all components of the respirator are in good condition. Wear the respirator as required, making sure that the half-mask fits tightly against the face and adjusting the head strap properly. 1.2 Mask leak testing 1.2.1 Place the palm on the air intake mechanism of the mask. 1.2.2 Inhale and then hold your breath for a few seconds; the mask should stay in place on the face without moving, which indicates no leakage. 1.2.3 If the mask moves, there is a leakage issue; adjust the mask straps and repeat the leak test until no leakage is detected. 1.3 Respiratory pressure measurement 1.3.1 Open the valve of the gas cylinder and ensure that the pointer on the pressure gauge on the chest is within the green range. 1.3.2 Remove the supply valve from the waist holder and insert it into the mechanism on the mask; a \"click\" sound indicates that the supply valve is properly connected to the mask. 1.3.3 Take a quick deep breath to activate and open the breathing valve. 1.3.4 Repeat breathing 12 times to check the air flow rate. 1.3.5 When the red circular button is turned quickly, you will feel an increase in the airflow of air. All the above tests have passed, so you can use it with confidence. Usage: (1) Open the gas cylinder valve, check the pressure inside the cylinder (the pressure should be 24 MPa or higher), then close the valve and release any remaining gas. 　　(2) With the cylinder valve and back support facing upward, wear the respirator in a over-shoulder or cross-style, and adjust the position and tightness of the shoulder straps until it feels comfortable. 　　(3) Insert the belt plug, then pull the elastic strap on one side of the belt backward to fasten it securely. 　　(4) Open the head mesh of the mask, put the mask on the head from top to bottom, and adjust its position. Press the mask’s air inlet with your hand and check the seal by taking a breath; if the seal is poor, tighten the mask straps or put on the mask again. 　　(5) Open the gas cylinder valve and supply valve. 　　(6) Align the air supply valve interface with the mask interface, then hold the inhalation part of the mask; use the left hand to press the air supply valve inward, and installation is complete once a \"click\" sound is heard. 　　(7) Breathe several times to check the performance of the air supply valve. Both inhalation and exhalation should be smooth, without any discomfort.

1. Turn on the gas cylinder valve, and check whether the valve and pressure gauge operate smoothly and accurately, and whether the pressure is within the specified range of 20–30 Mpa. Work cannot be carried out when the air pressure is below 20 Mpa. It is strictly prohibited to open the cylinder valve after putting on the mask first. 2. Check whether the belt, shoulder straps, and mask are suitable. Does the alarm emit sound, and is the volume loud enough to be heard clearly? 3. The air respirator cylinder valve should be positioned downward at the back of the body; adjust the shoulder and waist straps according to one’s body build to ensure a proper fit that is comfortable to wear ； 4. Connect the mask to the air valve, put the neck strap of the mask around the neck, position the mask in front of the chest, adjust the tightness of the head straps while wearing the mask, take deep breaths; if everything is normal, tighten the straps of the mask to ensure good airtightness ； 5. When working with an air respirator, it is necessary to constantly monitor the readings on the pressure gauge. When the pressure drops to 4–6 Mpa, an alarm is triggered; upon hearing this alarm, one must evacuate the toxic area and reach a safe location within 5–8 minutes ； 6. Remove the mask, set the air supply valve switch to the off position, turn off the cylinder valve, and remove the cylinder; at the same time, set the air supply valve switch to the on position to release any remaining air in the respirator. 8. Remove the air supply valve from the mask, and clean off any oil, toxic or harmful substances, as well as dust from the cylinder and the equipment.

(1) First, open the gas cylinder valve and check whether the pressure on the gauge is at least 250 bar； (2) Place the safety helmet on the side of the respirator, in a location that is easy to access ； (3) Turn the cylinder valve downward and attach it to the air respirator. First, tighten the shoulder straps, then tighten the waist belt so that the back support fits securely against the back ； (4) Pick up the safety helmet, put the straps around your neck, and then place the helmet at the back of your neck ； (5) Check the airtightness of the mask. The jaw fits into the recessed groove below the mask. Pull the head cover from the upper front part of the head downward to the back, put it on the head, adjust the position of the mask, tighten the neck strap at the bottom, and then tighten the three straps at the top until they are in the proper position. Cover the mask’s interface area with the palm of the hand, inhale until negative pressure is created, and check whether the seal between the mask and the face is good ； (6) After the airtightness test is completed, install the air supply valve on the mask; upon hearing a click, the air supply valve will open automatically ； (7) Put the safety helmet at the back of the neck on your head and tighten the straps ； (8) Wear the air respirator properly, and only after thoroughly checking it to ensure it is in good condition should it be used at the site. During use, pay attention to the alarm signals emitted by the alarm device (an alarm is triggered at 5 MP; the air respirator can be used for approximately 5–8 minutes from the moment the alarm sounds). Upon hearing the alarm signal, evacuate the area immediately; do not remove the mask of the air respirator until you have reached a safe location ； (9) After using the respirator, pinch the yellow buttons on both sides of the air supply valve with your hands to remove it, take off the mask, and then close the cylinder valve ； (10) Used gas cylinders should be refilled in a timely manner to reach the specified pressure. The mask and the air supply valve are kept separate and stored properly as required, to remain ready for use at all times.

Answer: 1. Turn on the gas cylinder valve, check whether the valve and pressure gauge operate smoothly and accurately, and ensure that the pressure is within the specified range of 20–30 Mpa. Work cannot be carried out when the air pressure is below 20 Mpa. It is strictly prohibited to open the cylinder valve after putting on the mask first. 2. Check whether the belt, shoulder straps, and mask are suitable. Does the alarm emit sound, and is the volume loud enough to be heard clearly? 3. The air respirator cylinder valve should be positioned downward at the back of the body; adjust the shoulder and waist straps according to one’s body build to ensure a proper fit that is comfortable to wear ； 4. Connect the mask to the air valve, put the neck strap of the mask around the neck, position the mask in front of the chest, adjust the tightness of the head straps while wearing the mask, take deep breaths; if everything is normal, tighten the straps of the mask to ensure good airtightness ； 5. When working with an air respirator, it is necessary to constantly monitor the readings on the pressure gauge. When the pressure drops to 4–6 Mpa, an alarm is triggered; upon hearing this alarm, one must evacuate the toxic area and reach a safe location within 5–8 minutes ； 6. Remove the mask, set the air supply valve switch to the off position, turn off the cylinder valve, and remove the cylinder; at the same time, set the air supply valve switch to the on position to release any remaining air in the respirator. 8. Remove the air supply valve from the mask, and clean off any oil, toxic or harmful substances, as well as dust from the cylinder and the equipment.

1) First, open the gas cylinder valve and check whether the pressure on the gauge is at least 250 bar； (2) Place the safety helmet on the side of the respirator, in a location that is easy to access ； (3) Turn the cylinder valve downward and attach it to the air respirator. First, tighten the shoulder straps, then tighten the waist belt so that the back support fits securely against the back ； (4) Pick up the safety helmet, put the straps around your neck, and then place the helmet at the back of your neck ； (5) Check the airtightness of the mask. The jaw fits into the recessed groove below the mask. Pull the head cover from the upper front part of the head downward to the back, put it on the head, adjust the position of the mask, tighten the neck strap at the bottom, and then tighten the three straps at the top until they are in the proper position. Cover the mask’s interface area with the palm of the hand, inhale until negative pressure is created, and check whether the seal between the mask and the face is good ； (6) After the airtightness test is completed, install the air supply valve on the mask; upon hearing a click, the air supply valve will open automatically ； (7) Put the safety helmet at the back of the neck on your head and tighten the straps ； (8) Wear the air respirator properly, and only after thoroughly checking it to ensure it is in good condition should it be used at the site. During use, pay attention to the alarm signals emitted by the alarm device (an alarm is triggered at 5 MP; the air respirator can be used for approximately 5–8 minutes from the moment the alarm sounds). Upon hearing the alarm signal, evacuate the area immediately; do not remove the mask of the air respirator until you have reached a safe location ； (9) After using the respirator, pinch the yellow buttons on both sides of the air supply valve with your hands to remove it, take off the mask, and then close the cylinder valve ； (10) Used gas cylinders should be refilled in a timely manner to reach the specified pressure. The mask and the air supply valve are kept separate and stored properly as required, to remain ready for use at all times.

(1) First, open the gas cylinder valve and check whether the pressure on the gauge is at least 250 bar； (2) Place the safety helmet on the side of the respirator, in a location that is easy to access ； (3) Turn the cylinder valve downward and attach it to the air respirator. First, tighten the shoulder straps, then tighten the waist belt so that the back support fits securely against the back ； (4) Pick up the safety helmet, put the straps around your neck, and then place the helmet at the back of your neck ； (5) Check the airtightness of the mask. The jaw fits into the recessed groove below the mask. Pull the head cover from the upper front part of the head downward to the back, put it on the head, adjust the position of the mask, tighten the neck strap at the bottom, and then tighten the three straps at the top until they are in the proper position. Cover the mask’s interface area with the palm of the hand, inhale until negative pressure is created, and check whether the seal between the mask and the face is good ； (6) After the airtightness test is completed, install the air supply valve on the mask; upon hearing a click, the air supply valve will open automatically ； (7) Put the safety helmet at the back of the neck on your head and tighten the straps ； (8) Wear the air respirator properly, and only after thoroughly checking it to ensure it is in good condition should it be used at the site. During use, pay attention to the alarm signals emitted by the alarm device (an alarm is triggered at 5 MP; the air respirator can be used for approximately 5–8 minutes from the moment the alarm sounds). Upon hearing the alarm signal, evacuate the area immediately; do not remove the mask of the air respirator until you have reached a safe location ； (9) After using the respirator, pinch the yellow buttons on both sides of the air supply valve with your hands to remove it, take off the mask, and then close the cylinder valve ； (10) Used gas cylinders should be refilled in a timely manner to reach the specified pressure. The mask and the air supply valve are kept separate and stored properly as required, to remain ready for use at all times.

(1) First, open the gas cylinder valve and check whether the pressure on the gauge is at least 250 bar； (2) Place the safety helmet on the side of the respirator, in a location that is easy to access ； (3) Turn the cylinder valve downward and attach it to the air respirator. First, tighten the shoulder straps, then tighten the waist belt so that the back support fits securely against the back ； (4) Pick up the safety helmet, put the straps around your neck, and then place the helmet at the back of your neck ； (5) Check the airtightness of the mask. The jaw fits into the recessed groove below the mask. Pull the head cover from the upper front part of the head downward to the back, put it on the head, adjust the position of the mask, tighten the neck strap at the bottom, and then tighten the three straps at the top until they are in the proper position. Cover the mask’s interface area with the palm of the hand, inhale until negative pressure is created, and check whether the seal between the mask and the face is good ； (6) After the airtightness test is completed, install the air supply valve on the mask; upon hearing a click, the air supply valve will open automatically ； (7) Put the safety helmet at the back of the neck on your head and tighten the straps ； (8) Wear the air respirator properly, and only after thoroughly checking it to ensure it is in good condition should it be used at the site. During use, pay attention to the alarm signals emitted by the alarm device (an alarm is triggered at 5 MP; the air respirator can be used for approximately 5–8 minutes from the moment the alarm sounds). Upon hearing the alarm signal, evacuate the area immediately; do not remove the mask of the air respirator until you have reached a safe location ； (9) After using the respirator, pinch the yellow buttons on both sides of the air supply valve with your hands to remove it, take off the mask, and then close the cylinder valve ； (10) Used gas cylinders should be refilled in a timely manner to reach the specified pressure. The mask and the air supply valve are kept separate and stored properly as required, to remain ready for use at all times.