Supply Pute PM-3 Maxwell vacuum gauge Beijing Maxwell vacuum gauge

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Produced by Beijing Pute Instrument Complete Factory - Maxi Vacuum Gauge 1. Principles and uses :
, McLeod vacuum gauge, also known as McLeod vacuum gauge (also called rotary compression vacuum gauge), is designed based on Boyle-Marriott's law of ideal isothermal compression. Because it can directly calculate the pressure value through its own parameters, in addition to pressure measurement, it can also be used as an absolute vacuum gauge to verify some relative vacuum gauges (such as the seat-type compression vacuum gauge is one of them), so it is widely used. It is used in vacuum degree measurement work in industry, national defense, scientific research, medicine, refrigeration, etc.
. The - type combined Maxwell vacuum gauge produced by our company includes the - and - type. The measuring range is divided into - and -. The two-stage process covers the original - and - products. At present, our company mainly Mainly based on production-type models, its accuracy is higher than traditional models and its volume is smaller.
2. How to use:
Before use, lift up the vacuum exhaust pipe and place the vacuum gauge underneath to prevent the mercury beads in the glass tube from sliding into the exhaust pipe during transportation. Then pull up the rubber stopper, apply castor oil or vacuum grease on the inner wall of the exhaust pipe, directly connect it to the interface of the vacuum system under test, turn on the mechanical vacuum pump for about 1 minute, and then slowly open the vacuum valve connected to the outside of the vacuum meter. At this time, the meter enters working status.
. If the vacuum degree of the vacuum system is rough vacuum, for the - type, then just look at the pressure of the right type vacuum gauge. The reading value is the sum of the scale values pointed by the two mercury beads. When the vacuum degree is low (i.e.) When the end faces of the two mercury columns are basically parallel, you need to look at the vacuum gauge on the left. Its operation method is the same as the original McFarland vacuum gauge (shown on the surface printing).
3. Maintenance and care:
During transportation and use, be careful not to lay it upside down to prevent the mercury from returning to the vacuum tube or the mercury beads entering the middle closed capillary to block the capillary and affect the measurement accuracy. Therefore, the vacuum rubber tube must be straightened before each use so that the mercury can flow back into the vacuum gauge glass tube.
When measuring, that is, when the vacuum gauge is in an upright state, it is strictly forbidden to rush any gas into the vacuum system to avoid impacting the glass tube and causing it to break.
The working mercury in the vacuum gauge has been treated with chemical and physical methods and has a certain degree of cleanliness. Mercury oxidation pollution caused by long-term use and other reasons will directly affect the measurement accuracy. It should be sent for repair in time and can only be used after passing the inspection.
After the measurement, the vacuum gauge should use a clamp to clamp the vacuum rubber tube and isolate it from the vacuum system gas. This can keep the mercury in the vacuum gauge clean and prevent the atmosphere from strongly impacting the vacuum gauge and causing it to break when the vacuum gauge is removed and separated. If you do not remove the vacuum gauge, be sure to disconnect the mechanical pump from the vacuum system air path after the mechanical vacuum pump stops and put the mechanical pump into the atmosphere to prevent the mechanical pump oil from returning to the vacuum system and the vacuum gauge from being contaminated by oil.
4. Technical indicators:
Standards used for the accuracy error of the model measurement range
. -. Model scale is . Grade Maxi scale is % -
/-
. % /-
. -%-% /