Matters needing attention when sampling gas cylinders 1. In order to ensure that the representative samples and safe sampling that meet the requirements are collected, the sampling personnel must understand the safety technology, have the necessary experience and skills, and pay strict attention to the details during the sampling. 2. During the cleaning of the sampler and the discharge of the sample in the sampler, pay attention to safety when handling waste liquid and steam. The discharge point must have safety facilities and comply with safety and environmental protection regulations. Seven. Sampling preparation 1. At room temperature, open the needle valves A and B, connect the sampler to the connecting pipe, and purge the purified sampling device with dry nitrogen (GB3864-83). 2. Move the sampling device into a constant temperature drying oven at 105 ~ 110 ℃, continue to purge with dry nitrogen for at least 30 minutes via the air inlet pipe connected to the connecting pipe and passing through the wall hole of the constant temperature drying oven. 3. Close the needle valve A, remove the sampler, connect the vacuum pump to the outlet valve B, evacuate until the pressure in the sampler reaches 100Pa or lower, and keep this pressure for no less than 30 minutes. 4. Close needle valve B to cool the sampler. 5. Weigh the empty sampler on the balance and weigh it to 1g. Eight. Take samples 1. Immerse the sampler in a freezing bath at about -35 ° C and cool it for 10 to 15 minutes to prevent frost on the valve. 2. One end of the connecting tube is tightly connected to the liquid valve of the liquid ammonia container, and the other end is connected to the needle valve A, and the connection is tightly connected. 3. Carefully open the liquid valve of the liquid ammonia container to let the liquid ammonia flow out, open the needle valve A, and let the liquid ammonia flow into the sampler to the specified safe filling volume. Close the needle valve A and the liquid valve of the liquid ammonia container, and remove the sampler. Inspection of filling volume: 1. After calculating the mass according to the volume of the sampler and the density of liquid ammonia, the weight of the sampler after sampling is weighed with a balance and weighed to 1g, thereby determining the amount of liquid ammonia taken. 2. If the sampling volume exceeds the prescribed limit, the excess will be discarded according to the following method: After the needle valve B is connected to the rubber tube, the sampler is placed vertically (the needle valve is on the top), and carefully open the needle valve B to allow excess Liquid ammonia flows out until it turns off when ammonia vapor appears. 3. Remove the rubber tube, weigh the sampler again, and weigh to 1g. nine. Sampler inspection and scrapping 1. Strong check of the sampler In view of the particularity of explosive and flammable gases, in order to ensure safety strictly, the sampler must be sent to the statutory agency or returned to our company for strong inspection no matter what the condition is. The company is responsible for the overdue responsibility, our company will not notify you). 2. Sampler scrapped The sampler must be scrapped forcibly 50 months from the date the product leaves the factory. Jumbo Roll Toilet Paper,Jumbo Toilet Paper,Jumbo Toilet Roll,Jumbo Toilet Paper Roll DONGGUAN YEE HUP TRADING CO,.LTD , https://www.yeehupacks.com